US 5,689,529 A · Communications method and apparatus for digital information

An apparatus for digital information transfer comprising:

a) means for allocating one or more source digital signals to unique, repetitive time slots;
b) means for generating an analog information wave for each said source digital signal, each said information wave being synthesized by combining a fundamental frequency wave of a pre-selected wave form and a pre-selected number of harmonics of the fundamental frequency wave, the amplitude and phase of the fundamental frequency wave and the amplitude and phase of each of the harmonics of the synthesized wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
c) means for transmitting each of the analog information waves within its allocated time slot;
d) means for receiving each of the analog information waves within its allocated time slot;
e) means for extracting the fundamental frequency wave and each of the harmonics of each analog information wave received during its allocated time slot;
and
f) means for generating an output digital signal for each information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the amplitude and phase of the extracted fundamental frequency wave and the amplitude and phase of the extracted harmonics of the corresponding received information wave.

4 more elements

An apparatus for digital information transfer comprising:

a) means for generating synchronizing waves of pre-set wave form and frequency;
b) means for allocating one or more source digital signals to unique time slots between successive synchronizing waves;
c) means for generating an analog information wave for each said source digital signal, each said information wave being synthesized by combining a fundamental frequency wave of a pre-selected wave form and a pre-selected number of harmonics of the fundamental frequency wave, the amplitude and phase of the fundamental frequency wave and the amplitude and phase of each of the harmonics of the synthesized wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
d) means for transmitting the information wave for each source digital signal within its allocated time slot;
e) means for receiving the information wave for each source digital signal during the allocated time slot for the source digital signal as referenced to successive synchronizing waves;
f) means for extracting the fundamental frequency wave and each of the harmonics of each analog information wave received during its allocated time slot;
and
g) means for generating an output digital signal for each information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the amplitude and phase of the extracted fundamental frequency wave and the amplitude and phase of the extracted harmonics of the corresponding received information wave.

5 more elements

An apparatus for digital information transfer comprising:

a) a synchronization wave generation circuit;
b) a circuit for allocating one or more source digital signals to unique time slots between successive synchronizing waves;
c) one or more digital to analog signal generators for generating an analog information wave for each source digital signal, which information wave is synthesized by combining a fundamental frequency wave of a pre-selected wave form and a pre-selected number of harmonics of the fundamental frequency wave, the amplitude and phase of the fundamental frequency wave and the amplitude and phase of each of the harmonics of the synthesized wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
d) one or more transmitters for transmitting the information wave for each source digital signal within its allocated time slot;
e) one or more receivers for receiving the information wave for each source digital signal within the allocated time slot for the source digital signal as referenced to successive synchronization waves;
f) one or more circuits for extracting the fundamental frequency wave and each of the harmonics of each analog information wave received during its allocated time slot;
and
g) one or more circuits for generating an output digital signal for each information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the amplitude and phase of the extracted fundamental frequency wave and the amplitude and phase of the extracted harmonics of the corresponding received information wave.

5 more elements

An apparatus for digital information transfer comprising:

a) means for generating synchronizing waves of pre-set wave form and frequency;
b) means for transmitting said synchronizing waves to one or more remote transmission locations;
c) means for receiving said synchronizing waves at each remote transmission location;
d) means for allocating one or more source digital signals at each remote transmission location to unique time slots between successive synchronizing waves;
e) means for generating an analog information wave for each said source digital signal at each remote transmission location, each said information wave being synthesized by combining a fundamental frequency wave of a pre-selected wave form and a pre-selected number of harmonics of the fundamental frequency wave, the amplitude and phase of the fundamental frequency wave and the amplitude and phase of each of the harmonics of the synthesized wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
f) means for transmitting the information wave for each source digital signal from each remote transmission location;
g) means for receiving, at one or more locations, the information wave for each source digital signal transmitted from each remote transmission location, the information wave being received within its allocated time slot as referenced to successive synchronization waves;
h) means for extracting the fundamental frequency wave and each of the harmonics of each analog information wave received during its allocated time slot at one or more locations;
and
i) means for generating an output digital signal for each information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the amplitude and phase of the extracted fundamental frequency wave and the amplitude and phase of the extracted harmonics of the corresponding received information wave.

7 more elements

An apparatus for digital information transfer comprising:

a) means for allocating one or more source digital signals to unique, repetitive time slots;
b) means for generating an analog information wave for each said source digital signal, each said information wave being synthesized by combining a fundamental frequency wave of a pre-selected wave form and a pre-selected number of harmonics of the fundamental frequency wave, the amplitude and phase of the fundamental frequency wave being fixed and the relative amplitudes of each of the harmonics of the synthesized wave and the phases of each of the harmonics being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
c) means for transmitting each of the analog information waves within its allocated time slot;
d) means for receiving each of the analog information waves within its allocated time slot;
e) means for extracting the fundamental frequency wave and each of the harmonics of each analog information wave received during its allocated time slot;
and
f) means for generating an output digital signal for each information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the relative amplitudes of each of the extracted harmonics in comparison to the amplitude of the extracted fundamental frequency wave and of the phases of each of the extracted harmonics of the corresponding received information wave.

4 more elements

A method for digital information transfer comprising the steps of:

a) allocating one or more source digital signals to unique, repetitive time slots;
b) generating an analog information wave for each said source digital signal, each said information wave being synthesized by combining a fundamental frequency wave of a pre-selected wave form and a pre-selected number of harmonics of the fundamental frequency wave, the amplitude and phase of the fundamental frequency wave and the amplitude and phase of each of the harmonics of the synthesized wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
c) transmitting each of the analog information waves within its allocated time slot;
d) receiving each of the analog information waves within its allocated time slot;
e) extracting the fundamental frequency wave and each of the harmonics of each analog information wave received during its allocated time slot;
and
f) generating an output digital signal for each information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the amplitude and phase of the extracted fundamental frequency wave and the amplitude and phase of the extracted harmonics of the corresponding received information wave.

4 more elements

A method of digital information transfer comprising the steps of:

a) generating synchronizing waves of pre-set wave form and frequency;
b) allocating one or more source digital signals to unique time slots between successive synchronizing waves;
c) generating an analog information wave for each said source digital signal, each said information wave being synthesized by combining a fundamental frequency wave of a pre-selected wave form and a pre-selected number of harmonics of the fundamental frequency wave, the amplitude and phase of the fundamental frequency wave and the amplitude and phase of each of the harmonics of the synthesized wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
d) transmitting the information wave for each source digital signal within its allocated time slot;
e) receiving the information wave for each source digital signal during the allocated time slot for the source digital signal as referenced to successive synchronizing waves;
f) extracting the fundamental frequency wave and each of the harmonics of each analog information wave received during its allocated time slot;
and
g) generating an output digital signal for each information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the amplitude and phase of the extracted fundamental frequency wave and the amplitude and phase of the extracted harmonics of the corresponding received information wave.

5 more elements

A method of digital information transfer comprising the steps of:

a) generating synchronizing waves of pre-set wave form and frequency;
b) transmitting said synchronizing waves to one or more remote transmission locations;
c) receiving said synchronizing waves at each remote transmission location;
d) allocating one or more source digital signals at each remote transmission location to unique time slots between successive synchronizing waves;
e) generating an analog information wave for each said source digital signal at each remote transmission location, each said information wave being synthesized by combining a fundamental frequency wave of a pre-selected wave form and a pre-selected number of harmonics of the fundamental frequency wave, the amplitude and phase of the fundamental frequency wave and the amplitude and phase of each of the harmonics of the synthesized wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
f) transmitting the information wave for each source digital signal from each remote transmission location;
g) receiving, at one or more locations, the information wave for each source digital signal transmitted from each remote transmission location, the information wave being received within its allocated time slot as referenced to successive synchronization waves;
h) extracting the fundamental frequency wave and each of the harmonics of each analog information wave received during its allocated time slot at one or more locations;
and
i) generating an output digital signal for each information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the amplitude and phase of the extracted fundamental frequency wave and the amplitude and phase of the extracted harmonics of the corresponding received information wave.

7 more elements

A method of digital information transfer comprising the steps of:

a) allocating one or more source digital signals to unique, repetitive time slots;
b) generating an analog information wave for each said source digital signal, each said information wave being synthesized by combining a fundamental frequency wave of a pre-selected wave form and a pre-selected number of harmonics of the fundamental frequency wave, the amplitude and phase of the fundamental frequency wave being fixed and the relative amplitudes of each of the harmonics of the synthesized wave in comparison to the magnitude of the fundamental frequency wave and the phases of each of the harmonics being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
c) transmitting each of the analog information waves within its allocated time slot;
d) receiving each of the analog information waves within its allocated time slot;
e) extracting the fundamental frequency wave and each of the harmonics of each analog information wave received during its allocated time slot;
and
f) generating an output digital signal for each information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the relative amplitudes of each of the extracted harmonics in comparison to the amplitude of the extracted fundamental frequency wave and of the phases of each of the extracted harmonics of the corresponding received information wave.

4 more elements

An apparatus for digital information transfer comprising:

a) a synchronization wave generation circuit;
b) a circuit for allocating one or more source digital signals to unique time slots between successive synchronizing waves;
c) two or more digital to analog signal generators for simultaneously receiving two or more source digital signals which are allocated the same time slot, simultaneously generating an analog information signal for each of said two or more source digital signals;
d) a circuit for combining said analog information signals for a single combined analog information wave, which combined information wave is synthesized by combining a fundamental frequency wave of a pre-selected wave form and a pre-selected number of harmonics of the fundamental frequency wave, the amplitude and phase of the fundamental frequency wave and the amplitude and phase of each of the harmonics of the synthesized wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
e) one or more transmitters for transmitting each combined information wave within its allocated time slot;
f) one or more receivers for receiving the combined information wave within the allocated time slot for the source digital signals as referenced to successive synchronization waves;
g) one or more circuits for extracting the fundamental frequency wave and each of the harmonics of each analog information wave received during its allocated time slot;
h) one or more circuits for generating an output digital signal for each combined information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the amplitude and phase of the extracted fundamental frequency wave and the amplitude and phase of the extracted harmonics of the corresponding received combined information wave.

5 more elements

An apparatus for receiving an analog signal comprised of a series of information waves, each information wave being received in an allocated time slot and each information wave being synthesized from a combination of a fundamental frequency wave and a finite number of harmonics of the fundamental frequency wave, and for separating the synthesized wave into its fundamental frequency wave and harmonics comprising:

a) a plurality of pre-amplifiers connected in parallel, each pre-amplifier providing a different level of pre-amplification for the information waves;
b) a plurality of signal power level detectors, each power level detector being connected in series with a pre-amplifier and receiving the pre-amplified information wave from the connected pre-amplifier, and each power level detector measuring the power level of the pre-amplified information wave it receives;
c) a timing control circuit which determines the time period during which each information wave will be admitted to the pre-amplifiers and determines which of the pre-amplified information wave signals from the power level detectors is of an appropriate power level for further processing;
d) an address storage circuit which provides time slot allocations to the timing control circuit;
e) a multiplex circuit which receives the pre-amplified information wave signals from each of the power level detectors and passes only one pre-amplified information wave signal during each allocated time slot;
f) a multi-level impulse filter comprising a plurality of filter circuits connected in parallel, one for the fundamental frequency and one for each of the frequencies of the harmonics of the synthesized information waves, each said filter circuit comprising
(1) a plurality of signal delay circuits connected in parallel,
(2) a plurality of delay signal switches, each said switch being connected in series with a signal delay circuit, and
(3) a narrow bandpass filter connected to each of the delay signal switches;
g) a plurality of final switch circuits, each final switch circuit being connected in series with a filter circuit, said final switch circuits passing the pre-amplified, separated and filtered fundamental frequency wave and harmonics of each information wave received;
and
h) a timing circuit which establishes the proper timing of the impulse filter operations.

9 more elements

An apparatus for receiving an analog signal comprised of a series of information waves, each information wave being received in an allocated time slot and each information wave being synthesized from a combination of a fundamental frequency wave and a finite number of harmonics of the fundamental frequency wave, and for separating the synthesized wave into its fundamental frequency wave and harmonics comprising:

a) a plurality of pre-amplifiers connected in parallel, each pre-amplifier providing a different level of pre-amplification for the information waves;
b) a plurality of signal power level detectors, each power level detector being connected in series with a pre-amplifier and receiving the pre-amplified information wave from the connected pre-amplifier, and each power level detector measuring the power level of the pre-amplified information wave it receives;
c) a timing control circuit which determines the time period during which each information wave will be admitted to the pre-amplifiers and determines which of the pre-amplified information wave signals from the power level detectors is of an appropriate power level for further processing;
d) an address storage circuit which provides time slot allocations to the timing control circuit;
e) a multiplex circuit which receives the pre-amplified information wave signals from each of the power level detectors and passes only one pre-amplified information wave signal during each allocated time slot;
f) a multi-level impulse filter circuit for separating the fundamental frequency wave and harmonics of the synthesized information waves, said filter circuit comprising
(1) a plurality of signal delay circuits connected in parallel,
(2) a plurality of delay signal switches, each said switch being connected in series with a signal delay circuit, and
(3) a plurality of narrow bandpass filters connected in parallel to each other and connected together in series with each of the delay signal switches;
g) a plurality of final switch circuits, each final switch circuit being connected in series with a narrow bandpass filter, said final switch circuits passing the pre-amplified, separated and filtered fundamental frequency wave and harmonics of each information wave received;
and
h) a timing circuit which establishes the proper timing of the impulse filter operations.

9 more elements

An apparatus for receiving an analog signal comprised of a series of information waves, each information wave being received in an allocated time slot and each information wave being synthesized from a combination of a fundamental frequency wave and a finite number of harmonics of the fundamental frequency wave, and for separating the synthesized wave into its fundamental frequency wave and harmonics comprising:

a) a plurality of pre-amplifiers connected in parallel, each pre-amplifier providing a different level of pre-amplification for the information waves;
b) a plurality of signal power level detectors, each power level detector being connected in series with a pre-amplifier and receiving the pre-amplified information wave from the connected pre-amplifier, and each power level detector measuring the power level of the pre-amplified information wave it receives;
c) a timing control circuit which determines the time period during which each information wave will be admitted to the pre-amplifiers and determines which of the pre-amplified information wave signals from the power level detectors is of an appropriate power level for further processing;
d) an address storage circuit which provides time slot allocations to the timing control circuit;
e) a multiplex circuit which receives the pre-amplified information wave signals from each of the power level detectors and passes only one pre-amplified information wave signal during each allocated time slot;
f) a multi-level impulse filter comprising a plurality of filter circuits connected in parallel, one for the fundamental frequency and one for each of the frequencies of the harmonics of the synthesized information waves, each said filter circuit comprising
(1) a plurality of signal delay circuits connected in parallel,
(2) a plurality of delay signal switches, each said switch being connected in series with a signal delay circuit, and
(3) a narrow bandpass filter connected to each of the delay signal switches;
g) a plurality of final switch circuits, each final switch circuit being connected in series with a filter circuit, said final switch circuits passing the pre-amplified, separated and filtered fundamental frequency wave and harmonics of each information wave received;
h) a timing circuit which establishes the proper timing of the impulse filter operations;
i) a plurality of component power level detectors which determine the power level of the fundamental frequency wave and each of the harmonics of each received information wave;
j) one or more analog to digital convertors for converting the separated and filtered fundamental frequency wave and harmonics of information waves received to digital;
and
k) an output signal generator for generating an output digital signal with a magnitude which is a function of the amplitude and phase of the fundamental frequency wave and harmonics of the information wave.

12 more elements

An apparatus for receiving an analog signal comprised of a series of information waves, each information wave being received in an allocated time slot and each information wave being synthesized from a combination of a fundamental frequency wave and a finite number of harmonics of the fundamental frequency wave, and for separating the synthesized wave into its fundamental frequency wave and harmonics comprising:

a) a plurality of pre-amplifiers connected in parallel, each pre-amplifier providing a different level of pre-amplification for the information waves;
b) a plurality of signal power level detectors, each power level detector being connected in series with a pre-amplifier and receiving the pre-amplified information wave from the connected pre-amplifier, and each power level detector measuring the power level of the pre-amplified information wave it receives;
c) a timing control circuit which determines the time period during which each information wave will be admitted to the pre-amplifiers and determines which of the pre-amplified information wave signals from the power level detectors is of an appropriate power level for further processing;
d) an address storage circuit which provides time slot allocations to the timing control circuit;
e) a multiplex circuit which receives the pre-amplified information wave signals from each of the power level detectors and passes only one pre-amplified information wave signal during each allocated time slot;
f) a multi-level impulse filter circuit for separating the fundamental frequency wave and harmonics of the synthesized information waves, said filter circuit comprising
(1) a plurality of signal delay circuits connected in parallel,
(2) a plurality of delay signal switches, each said switch being connected in series with a signal delay circuit, and
(3) a plurality of narrow bandpass filters connected in parallel to each other and connected together in series with each of the delay signal switches;
g) a plurality of final switch circuits, each final switch circuit being connected in series with a narrow bandpass filter, said final switch circuits passing the pre-amplified, separated and filtered fundamental frequency wave and harmonics of each information wave received;
h) a timing circuit which establishes the proper timing of the impulse filter operations;
and
i) a plurality of component power level detectors which determine the power level of the fundamental frequency wave and each of the harmonics of each received information wave;
j) one or more analog to digital convertors for converting the separated and filtered fundamental frequency wave and harmonics of information waves received to digital;
and
k) an output signal generator for generating an output digital signal with a magnitude which is a function of the amplitude and phase of the fundamental frequency wave and harmonics of the information wave.

13 more elements

An apparatus for receiving an analog signal comprised of a series of information waves, each information wave being received in an allocated time slot and each information wave being synthesized from a combination of a fundamental frequency wave and a finite number of harmonics of the fundamental frequency wave, and for separating the synthesized wave into its fundamental frequency wave and harmonics comprising:

a) a plurality of pre-amplifiers connected in parallel, each pre-amplifier providing a different level of pre-amplification for the information waves;
b) a plurality of signal power level detectors, each power level detector being connected in series with a pre-amplifier and receiving the pre-amplified information wave from the connected pre-amplifier, and each power level detector measuring the power level of the pre-amplified information wave it receives;
c) a timing control circuit which determines the time period during which each information wave will be admitted to the pre-amplifiers and determines which of the pre-amplified information wave signals from the power level detectors is of an appropriate power level for further processing;
d) an address storage circuit which provides time slot allocations to the timing control circuit;
e) a multiplex circuit which receives the pre-amplified information wave signals from each of the power level detectors and passes only one pre-amplified information wave signal during each allocated time slot;
f) a multi-level impulse filter comprising a plurality of filter circuits connected in parallel, one for the fundamental frequency and one for each of the frequencies of the harmonics of the synthesized information waves, each said filter circuit comprising
(1) a plurality of signal delay circuits connected in parallel,
(2) a plurality of delay signal switches, each said switch being connected in series with a signal delay circuit, and
(3) a narrow bandpass filter connected to each of the delay signal switches;
g) a plurality of final switch circuits, each final switch circuit being connected in series with a filter circuit, said final switch circuits passing the pre-amplified, separated and filtered fundamental frequency wave and harmonics of each information wave received;
h) a timing circuit which establishes the proper timing of the impulse filter operations;
i) a sample hold and signal reconstruct circuit which re-synthesizes the received analog information wave from the separated and filtered fundamental frequency wave and harmonics;
j) a plurality of positive peak detectors which determine the maximum positive amplitude of the fundamental frequency wave and each harmonic of the re-synthesized information wave;
k) a plurality of negative peak detectors which determine the maximum negative amplitude of the fundamental frequency wave and each harmonic of the re-synthesized information wave, the negative peak detector being connected in parallel with the positive peak detectors;
l) a plurality of analog to digital convertors for converting the peak positive and peak negative amplitudes to digital;
and
m) an output signal generator for generating an output digital signal based upon the digital values of the positive and negative peaks.

14 more elements

An apparatus for digital information transfer comprising:

a) means for generating repetitive synchronizing waves of a pre-set wave form and frequency;
b) means for allocating one or more source digital signals to unique repetitive time slots, a synchronizing wave being generated in each time slot, the time slot allocated to each source digital signal being cycled at a selected frequency;
c) means for generating an analog information wave for each said source digital signal, each said information wave being of a pre-selected wave form and frequency, said information wave frequency being distinct from the frequency of the synchronizing waves, and the amplitude of each information wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
d) means for transmitting each analog information wave and each corresponding synchronizing wave within the time slot allocated to them;
e) means for receiving each analog information wave and each corresponding synchronizing wave within the time slot allocated to them;
f) means for determining the amplitudes of each analog information wave and each corresponding synchronizing wave received during the time slot allocated to them;
g) means for generating an output digital signal for each information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the amplitude of the corresponding received information wave;
and
h) means for calibrating each output digital signal by comparison of the amplitude of the corresponding synchronizing wave as received with its known amplitude as transmitted.

6 more elements

An apparatus for digital information transfer comprising:

a) means for generating repetitive synchronizing waves of a pre-set wave form and frequency;
b) means for transmitting the synchronizing waves to one or more remote transmission locations;
c) means for receiving the synchronizing waves at each of the remote transmission locations;
d) means for allocating one or more source digital signals to unique repetitive time slots, a synchronizing wave being generated in each time slot, the time slot allocated to each source digital signal being cycled at a selected frequency;
e) means for generating an analog information wave for each said source digital signal, each said information wave being of a pre-selected wave form and frequency, said information wave frequency being distinct from the frequency of the synchronizing waves, and the amplitude of each information wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
f) means for transmitting each analog information wave and each corresponding synchronizing wave within the time slot allocated to them;
g) means for receiving at one or more receiving locations each analog information wave and each corresponding synchronizing wave within the time slot allocated to them;
h) means for determining the amplitudes of each analog information wave and each corresponding synchronizing wave received during the time slot allocated to them;
i) means for generating an output digital signal for each information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the amplitude of the corresponding received information wave;
and
j) means for calibrating each output digital signal by comparison of the amplitude of the corresponding synchronizing wave as received with its known amplitude as transmitted.

8 more elements

An apparatus for digital information transfer comprising:

a) means for generating repetitive synchronizing waves of a pre-set wave form and frequency;
b) means for allocating one or more source digital signals to unique repetitive time slots, a synchronizing wave being generated in each time slot, the time slot allocated to each source digital signal being cycled at a selected frequency;
c) means for generating an analog information wave for each said source digital signal, each said information wave being of a pre-selected wave form and frequency, said information wave frequency being distinct from the frequency of the synchronizing waves, and the ratio of the amplitude of each information wave to the amplitude of the synchronizing wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
d) means for transmitting each analog information wave and each corresponding synchronizing wave within the time slot allocated to them;
e) means for receiving each analog information wave and each corresponding synchronizing wave within the time slot allocated to them;
f) means for determining the amplitudes of each analog information wave and each corresponding synchronizing wave received during the time slot allocated to them;
and
g) means for generating an output digital signal for each information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the ratio of the amplitude of the corresponding received information wave to the amplitude of the synchronizing wave.

5 more elements

An apparatus for digital information transfer comprising:

a) means for generating repetitive synchronizing waves of a pre-set wave form and frequency;
b) means for transmitting the synchronizing waves to one or more remote transmission locations;
c) means for receiving the synchronizing waves at each of the remote transmission locations;
d) means for allocating one or more source digital signals to unique repetitive time slots, a synchronizing wave being generated in each time slot, the time slot allocated to each source digital signal being cycled at a selected frequency;
e) means for generating an analog information wave for each said source digital signal, each said information wave being of a pre-selected wave form and frequency, said information wave frequency being distinct from the frequency of the synchronizing waves, and the ratio of the amplitude of each information wave to the amplitude of the synchronizing wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
f) means for transmitting each analog information wave and each corresponding synchronizing wave within the time slot allocated to them;
g) means for receiving at one or more receiving locations each analog information wave and each corresponding synchronizing wave within the time slot allocated to them;
h) means for determining the amplitudes of each analog information wave and each corresponding synchronizing wave received during the time slot allocated to them;
and
i) means for generating an output digital signal for each information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the ratio of the amplitude of the corresponding received information wave to the amplitude of the received synchronizing wave.

7 more elements

An apparatus for digital information transfer comprising:

a) means for generating repetitive synchronizing waves of a pre-set wave form and frequency;
b) means for allocating a plurality of source digital signals to unique repetitive time slots with a plurality of source digital signals being allocated to each time slot, a synchronizing wave being generated in each time slot, and the allocated time slots being cycled at a selected frequency;
c) means for generating an analog information wave for each of the plurality of source digital signals in each allocated time slot, the information waves for each of the plurality of source digital signals within each time slot being of pre-selected wave forms and distinct frequencies, each of the information wave frequencies also being distinct from the frequency of the synchronizing waves, and the amplitude of each information wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
d) means for transmitting each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave within the time slot allocated to them;
e) means for receiving each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave within the time slot allocated to them;
f) means for determining the amplitudes of each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave received during the time slot allocated to them;
g) means for generating an output digital signal for each of the plurality of information waves received during each allocated time slot, each said output digital signal having a digital magnitude which is a function of the amplitude of the corresponding received information wave;
and
h) means for calibrating each of the plurality of output digital signals generated in each time slot by comparison of the amplitude of the corresponding synchronizing wave as received in said time slot with its known amplitude as transmitted.

6 more elements

An apparatus for digital information transfer comprising:

a) means for transmitting generating repetitive synchronizing waves of a pre-set wave form and frequency;
b) means for transmitting the synchronizing waves to one or more remote transmission locations;
c) means for receiving the synchronizing waves at each of the remote transmission locations;
d) means for allocating a plurality of source digital signals to unique repetitive time slots with a plurality of source digital signals being allocated to each time slot, a synchronizing wave being generated in each time slot, and the allocated time slots being cycled at a selected frequency;
e) means for generating an analog information wave for each of the plurality of source digital signals in each allocated time slot, the information waves for each of the plurality of source digital signals within each time slot being of pre-selected wave forms and distinct frequencies, each of the information wave frequencies also being distinct from the frequency of the synchronizing waves, and the amplitude of each information wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
f) means for transmitting each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave within the time slot allocated to them;
g) means for receiving at one or more locations each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave within the time slot allocated to them;
h) means for determining the amplitudes of each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave received during the time slot allocated to them;
i) means for generating an output digital signal for each of the plurality of information waves received during each allocated time slot, each said output digital signal having a digital magnitude which is a function of the amplitude of the corresponding received information wave;
and
j) means for calibrating each of the plurality of output digital signals generated in each time slot by comparison of the amplitude of the corresponding synchronizing wave as received in said time slot with its known amplitude as transmitted.

8 more elements

An apparatus for digital information transfer comprising:

a) means for generating repetitive synchronizing waves of a pre-set wave form and frequency;
b) means for allocating a plurality of source digital signals to unique repetitive time slots with a plurality of source digital signals being allocated to each time slot, a synchronizing wave being generated in each time slot, and the allocated time slots being cycled at a selected frequency;
c) means for generating an analog information wave for each of the plurality of source digital signals in each allocated time slot, the information waves for each of the plurality of source digital signals within each time slot being of pre-selected wave forms and distinct frequencies, each of the information wave frequencies also being distinct from the frequency of the synchronizing waves, and the ratio of the amplitude of each information wave to the amplitude of the corresponding synchronizing wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
d) means for transmitting each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave within the time slot allocated to them;
e) means for receiving each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave within the time slot allocated to them;
f) means for determining the amplitudes of each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave received during the time slot allocated to them;
and
g) means for generating an output digital signal for each of the plurality of information waves received during each allocated time slot, each said output digital signal having a digital magnitude which is a function of the ratio of the amplitude of the corresponding received information wave to the amplitude of the received synchronizing wave.

5 more elements

An apparatus for digital information transfer comprising:

a) means for generating repetitive synchronizing waves of a pre-set wave form and frequency;
b) means for transmitting the synchronizing waves to one or more remote transmission locations;
c) means for receiving the synchronizing waves at each of the remote transmission locations;
d) means for allocating a plurality of source digital signals to unique repetitive time slots with a plurality of source digital signals being allocated to each time slot, a synchronizing wave being generated in each time slot, and the allocated time slots being cycled at a selected frequency;
e) means for generating an analog information wave for each of the plurality of source digital signals in each allocated time slot, the information waves for each of the plurality of source digital signals within each time slot being of pre-selected wave forms and distinct frequencies, each of the information wave frequencies also being distinct from the frequency of the synchronizing waves, and the ratio of the amplitude of each information wave to the amplitude of the corresponding synchronizing wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
f) means for transmitting each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave within the time slot allocated to them;
g) means for receiving at one or more locations each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave within the time slot allocated to them;
h) means for determining the amplitudes of each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave received during the time slot allocated to them;
and
i) means for generating an output digital signal for each of the plurality of information waves received during each allocated time slot, each said output digital signal having a digital magnitude which is a function of the ratio of the amplitude of the corresponding received information wave to the amplitude of the received synchronizing wave.

7 more elements

A method of digital information transfer comprising the steps of:

a) generating repetitive synchronizing waves of a pre-set wave form and frequency;
b) allocating one or more source digital signals to unique repetitive time slots, a synchronizing wave being generated in each time slot, the time slot allocated to each source digital signal being cycled at a selected frequency;
c) generating an analog information wave for each said source digital signal, each said information wave being of a pre-selected wave form and frequency, said information wave frequency being distinct from the frequency of the synchronizing waves, and the amplitude of each information wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
d) transmitting each analog information wave and each corresponding synchronizing wave within the time slot allocated to them;
e) receiving each analog information wave and each corresponding synchronizing wave within the time slot allocated to them;
f) determining the amplitudes of each analog information wave and each corresponding synchronizing wave received during the time slot allocated to them;
g) generating an output digital signal for each information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the amplitude of the corresponding received information wave;
and
h) calibrating each output digital signal by comparison of the amplitude of the corresponding synchronizing wave as received with its known amplitude as transmitted.

6 more elements

A method of digital information transfer comprising the steps of:

a) generating repetitive synchronizing waves of a pre-set wave form and frequency;
b) transmitting the synchronizing waves to one or more remote transmission locations;
c) receiving the synchronizing waves at each of the remote transmission locations;
d) allocating one or more source digital signals to unique repetitive time slots, a synchronizing wave being generated in each time slot, the time slot allocated to each source digital signal being cycled at a selected frequency;
e) generating an analog information wave for each said source digital signal, each said information wave being of a pre-selected wave form and frequency, said information wave frequency being distinct from the frequency of the synchronizing waves, and the amplitude of each information wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
f) transmitting each analog information wave and each corresponding synchronizing wave within the time slot allocated to them;
g) receiving at one or more receiving locations each analog information wave and each corresponding synchronizing wave within the time slot allocated to them;
h) determining the amplitudes of each analog information wave and each corresponding synchronizing wave received during the time slot allocated to them;
i) generating an output digital signal for each information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the amplitude of the corresponding received information wave;
and
j) calibrating each output digital signal by comparison of the amplitude of the corresponding synchronizing wave as received with its known amplitude as transmitted.

8 more elements

A method of digital information transfer comprising the steps of:

a) generating repetitive synchronizing waves of a pre-set wave form and frequency;
b) allocating one or more source digital signals to unique repetitive time slots, a synchronizing wave being generated in each time slot, the time slot allocated to each source digital signal being cycled at a selected frequency;
c) generating an analog information wave for each said source digital signal, each said information wave being of a pre-selected wave form and frequency, said information wave frequency being distinct from the frequency of the synchronizing waves, and the ratio of the amplitude of each information wave to the amplitude of the synchronizing wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
d) transmitting each analog information wave and each corresponding synchronizing wave within the time slot allocated to them;
e) receiving each analog information wave and each corresponding synchronizing wave within the time slot allocated to them;
f) determining the amplitudes of each analog information wave and each corresponding synchronizing wave received during the time slot allocated to them;
and
g) generating an output digital signal for each information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the ratio of the amplitude of the corresponding received information wave to the amplitude of the synchronizing wave.

5 more elements

A method of digital information transfer comprising the steps of:

a) generating repetitive synchronizing waves of a pre-set wave form and frequency;
b) transmitting the synchronizing waves to one or more remote transmission locations;
c) receiving the synchronizing waves at each of the remote transmission locations;
d) allocating one or more source digital signals to unique repetitive time slots, a synchronizing wave being generated in each time slot, the time slot allocated to each source digital signal being cycled at a selected frequency;
e) generating an analog information wave for each said source digital signal, each said information wave being of a pre-selected wave form and frequency, said information wave frequency being distinct from the frequency of the synchronizing waves, and the ratio of the amplitude of each information wave to the amplitude of the synchronizing wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
f) transmitting each analog information wave and each corresponding synchronizing wave within the time slot allocated to them;
g) receiving at one or more receiving locations each analog information wave and each corresponding synchronizing wave within the time slot allocated to them;
h) determining the amplitudes of each analog information wave and each corresponding synchronizing wave received during the time slot allocated to them;
and
i) generating an output digital signal for each information wave received during its allocated time slot, said output digital signal having a digital magnitude which is a function of the ratio of the amplitude of the corresponding received information wave to the amplitude of the received synchronizing wave.

7 more elements

A method of digital information transfer comprising the steps of:

a) generating repetitive synchronizing waves of a pre-set wave form and frequency;
b) allocating a plurality of source digital signals to unique repetitive time slots with a plurality of source digital signals being allocated to each time slot, a synchronizing wave being generated in each time slot, and the allocated time slots being cycled at a selected frequency;
c) generating an analog information wave for each of the plurality of source digital signals in each allocated time slot, the information waves for each of the plurality of source digital signals within each time slot being of pre-selected wave forms and distinct frequencies, each of the information wave frequencies also being distinct from the frequency of the synchronizing waves, and the amplitude of each information wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
d) transmitting each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave within the time slot allocated to them;
e) receiving each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave within the time slot allocated to them;
f) determining the amplitudes of each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave received during the time slot allocated to them;
g) generating an output digital signal for each of the plurality of information waves received during each allocated time slot, each said output digital signal having a digital magnitude which is a function of the amplitude of the corresponding received information wave;
and
h) calibrating each of the plurality of output digital signals generated in each time slot by comparison of the amplitude of the corresponding synchronizing wave as received in said time slot with its known amplitude as transmitted.

6 more elements

A method of digital information transfer comprising the steps of:

a) transmitting generating repetitive synchronizing waves of a pre-set wave form and frequency;
b) transmitting the synchronizing waves to one or more remote transmission locations;
c) receiving the synchronizing waves at each of the remote transmission locations;
d) allocating a plurality of source digital signals to unique repetitive time slots with a plurality of source digital signals being allocated to each time slot, a synchronizing wave being generated in each time slot, and the allocated time slots being cycled at a selected frequency;
e) generating an analog information wave for each of the plurality of source digital signals in each allocated time slot, the information waves for each of the plurality of source digital signals within each time slot being of pre-selected wave forms and distinct frequencies, each of the information wave frequencies also being distinct from the frequency of the synchronizing waves, and the amplitude of each information wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
f) transmitting each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave within the time slot allocated to them;
g) receiving at one or more locations each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave within the time slot allocated to them;
h) determining the amplitudes of each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave received during the time slot allocated to them;
i) generating an output digital signal for each of the plurality of information waves received during each allocated time slot, each said output digital signal having a digital magnitude which is a function of the amplitude of the corresponding received information wave;
and
j) calibrating each of the plurality of output digital signals generated in each time slot by comparison of the amplitude of the corresponding synchronizing wave as received in said time slot with its known amplitude as transmitted.

8 more elements

A method of digital information transfer comprising the steps of:

a) generating repetitive synchronizing waves of a pre-set wave form and frequency;
b) allocating a plurality of source digital signals to unique repetitive time slots with a plurality of source digital signals being allocated to each time slot, a synchronizing wave being generated in each time slot, and the allocated time slots being cycled at a selected frequency;
c) generating an analog information wave for each of the plurality of source digital signals in each allocated time slot, the information waves for each of the plurality of source digital signals within each time slot being of pre-selected wave forms and distinct frequencies, each of the information wave frequencies also being distinct from the frequency of the synchronizing waves, and the ratio of the amplitude of each information wave to the amplitude of the corresponding synchronizing wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
d) transmitting each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave within the time slot allocated to them;
e) receiving each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave within the time slot allocated to them;
f) determining the amplitudes of each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave received during the time slot allocated to them;
and
g) generating an output digital signal for each of the plurality of information waves received during each allocated time slot, each said output digital signal having a digital magnitude which is a function of the ratio of the amplitude of the corresponding received information wave to the amplitude of the received synchronizing wave.

5 more elements

A method of digital information transfer comprising the steps of:

a) generating repetitive synchronizing waves of a pre-set wave form and frequency;
b) transmitting the synchronizing waves to one or more remote transmission locations;
c) receiving the synchronizing waves at each of the remote transmission locations;
d) allocating a plurality of source digital signals to unique repetitive time slots with a plurality of source digital signals being allocated to each time slot, a synchronizing wave being generated in each time slot, and the allocated time slots being cycled at a selected frequency;
e) generating an analog information wave for each of the plurality of source digital signals in each allocated time slot, the information waves for each of the plurality of source digital signals within each time slot being of pre-selected wave forms and distinct frequencies, each of the information wave frequencies also being distinct from the frequency of the synchronizing waves, and the ratio of the amplitude of each information wave to the amplitude of the corresponding synchronizing wave being a function of the magnitude of the corresponding source digital signal as measured during the allocated time slot for the signal;
f) transmitting each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave within the time slot allocated to them;
g) receiving at one or more locations each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave within the time slot allocated to them;
h) determining the amplitudes of each of the plurality of analog information waves at its pre-selected frequency and each corresponding synchronizing wave received during the time slot allocated to them;
and
i) generating an output digital signal for each of the plurality of information waves received during each allocated time slot, each said output digital signal having a digital magnitude which is a function of the ratio of the amplitude of the corresponding received information wave to the amplitude of the received synchronizing wave.

7 more elements

An apparatus for receiving an analog signal comprised of a series of information waves, each information wave being received in an allocated time slot and each information wave being synthesized from a combination of a fundamental frequency wave and a finite number of harmonics of the fundamental frequency wave, and for separating the synthesized wave into its fundamental frequency wave and harmonics comprising:

a) a plurality of pre-amplifiers connected in parallel, each pre-amplifier providing a different level of pre-amplification for the information waves;
b) a plurality of signal power level detectors, each power level detector being connected in series with a pre-amplifier and receiving the pre-amplified information wave from the connected pre-amplifier, and each power level detector measuring the power level of the pre-amplified information wave it receives;
c) a timing control circuit which determines the time period during which each information wave will be admitted to the pre-amplifiers and determines which of the pre-amplified information wave signals from the power level detectors is of an appropriate power level for further processing;
d) an address storage circuit which provides time slot allocations to the timing control circuit;
e) a multiplex circuit which receives the pre-amplified information wave signals from each of the power level detectors and passes only one pre-amplified information wave signal during each allocated time slot;
f) a multi-level impulse filter circuit for separating the fundamental frequency wave and harmonics of the synthesized information waves, said filter circuit comprising
(1) a plurality of signal delay circuits connected in parallel,
(2) a plurality of delay signal switches, each said switch being connected in series with a signal delay circuit, and
(3) a plurality of narrow bandpass filters connected in parallel to each other and connected together in series with each of the delay signal switches;
g) a plurality of final switch circuits, each final switch circuit being connected in series with a narrow bandpass filter, said final switch circuits passing the pre-amplified, separated and filtered fundamental frequency wave and harmonics of each information wave received;
h) a timing circuit which establishes the proper timing of the impulse filter operations;
i) a sample hold and signal reconstruct circuit which re-synthesizes the received analog information wave from the separated and filtered fundamental frequency wave and harmonics;
j) a plurality of positive peak detectors which determine the maximum positive amplitude of the fundamental frequency wave and each harmonic of the re-synthesized information wave;
k) a plurality of negative peak detectors which determine the maximum negative amplitude of the fundamental frequency wave and each harmonic of the re-synthesized information wave, the negative peak detector being connected in parallel with the positive peak detectors;
l) a plurality of analog to digital convertors for converting the peak positive and peak negative amplitudes to digital;
and
m) an output signal generator for generating an output digital signal based upon the digital values of the positive and negative peaks.

14 more elements

An apparatus for receiving and separating a plurality of simultaneous, combined analog signals of distinct frequencies, each said analog signal being comprised of a series of information waves in allocated time slots, said time slots being common for each of the simultaneous analog signals, said apparatus comprising:

a) a plurality of pre-amplifiers connected in parallel, each pre-amplifier providing a different level of pre-amplification for the plurality of information waves received simultaneously in each time slot;
b) a plurality of signal power level detectors, each power level detector being connected in series with a pre-amplifier and receiving the plurality of pre-amplified information waves in each time slot from the connected pre-amplifier, and each power level detector measuring the power level of the plurality of pre-amplified information waves it receives in each time slot;
c) a timing control circuit which determines the time period during which each information wave will be admitted to the pre-amplifiers and determines which of the pre-amplified signals from the power level detectors is of an appropriate power level for further processing;
d) an address storage circuit which provides time slot allocations to the timing control circuit;
e) a multiplex circuit which receives the pre-amplified information wave signals from each of the power level detectors and passes the simultaneous signals from only one pre-amplifier during each allocated time slot;
f) a multi-level impulse filter comprising a plurality of filter circuits connected in parallel, one for each frequency of analog signal received, each said filter circuit comprising
(1) a plurality of signal delay circuits connected in parallel,
(2) a plurality of delay signal switches, each said switch being connected in series with a signal delay circuit, and
(3) a narrow bandpass filter connected to each of the delay signal switches;
g) a plurality of final switch circuits, each final switch circuit being connected in series with a filter circuit, said final switch circuits passing the pre-amplified, separated and filtered information waves received in each time slot;
and
h) a timing circuit which establishes the proper timing of the impulse filter operations.

9 more elements

An apparatus for receiving and separating a plurality of simultaneous, combined analog signals of distinct frequencies, each said analog signal being comprised of a series of information waves in allocated time slots, said time slots being common for each of the simultaneous analog signals, said apparatus comprising:

a) a plurality of pre-amplifiers connected in parallel, each pre-amplifier providing a different level of pre-amplification for the plurality of information waves received simultaneously in each time slot;
b) a plurality of signal power level detectors, each power level detector being connected in series with a pre-amplifier and receiving the plurality of pre-amplified information waves in each time slot from the connected pre-amplifier, and each power level detector measuring the power level of the plurality of pre-amplified information waves it receives in each time slot;
c) a timing control circuit which determines the time period during which each information wave will be admitted to the pre-amplifiers and determines which of the pre-amplified signals from the power level detectors is of an appropriate power level for further processing;
d) an address storage circuit which provides time slot allocations to the timing control circuit;
e) a multiplex circuit which receives the pre-amplified information wave signals from each of the power level detectors and passes the simultaneous signals from only one pre-amplifier during each allocated time slot;
f) a multi-level impulse filter circuit for separating the combined analog signals received, said filter circuit comprising
(1) a plurality of signal delay circuits connected in parallel,
(2) a plurality of delay signal switches, each said switch being connected in series with a signal delay circuit, and
(3) a plurality of narrow bandpass filters connected in parallel to each other and connected together in series with each of the delay signal switches;
g) a plurality of final switch circuits, each final switch circuit being connected in series with a narrow bandpass filter, said final switch circuits passing the pre-amplified, separated and filtered information waves received in each time slot;
and
h) a timing circuit which establishes the proper timing of the impulse filter operations.

9 more elements

An apparatus for receiving and separating a plurality of simultaneous, combined analog signals of distinct frequencies, each said analog signal being comprised of a series of information waves in allocated time slots, said time slots being common for each of the simultaneous analog signals, said apparatus comprising:

a) a plurality of pre-amplifiers connected in parallel, each pre-amplifier providing a different level of pre-amplification for the plurality of information waves received simultaneously in each time slot;
b) a plurality of signal power level detectors, each power level detector being connected in series with a pre-amplifier and receiving the plurality of pre-amplified information waves in each time slot from the connected pre-amplifier, and each power level detector measuring the power level of the plurality of pre-amplified information waves it receives in each time slot;
c) a timing control circuit which determines the time period during which each information wave will be admitted to the pre-amplifiers and determines which of the pre-amplified signals from the power level detectors is of an appropriate power level for further processing;
d) an address storage circuit which provides time slot allocations to the timing control circuit;
e) a multiplex circuit which receives the pre-amplified information wave signals from each of the power level detectors and passes the simultaneous signals from only one pre-amplifier during each allocated time slot;
f) a multi-level impulse filter comprising a plurality of filter circuits connected in parallel, one for each frequency of analog signal received, each said filter circuit comprising
(1) a plurality of signal delay circuits connected in parallel,
(2) a plurality of delay signal switches, each said switch being connected in series with a signal delay circuit, and
(3) a narrow bandpass filter connected to each of the delay signal switches;
g) a plurality of final switch circuits, each final switch circuit being connected in series with a filter circuit, said final switch circuits passing the pre-amplified, separated and filtered information waves received in each time slot;
and
h) a timing circuit which establishes the proper timing of the impulse filter operations;
i) a plurality of power level detectors, each power level detector being connected in series with a final switch circuit, and determining the power level of each of the plurality of separated information waves in each time slot;
j) a plurality of analog to digital convertors for converting the separated and filtered information waves received in each time slot to digital;
and
k) an output signal generator for generating an output digital signal, for each converted information wave, with a magnitude which is a function of the digital magnitude of the converted information wave.

13 more elements

An apparatus for receiving and separating a plurality of simultaneous, combined analog signals of distinct frequencies, each said analog signal being comprised of a series of information waves in allocated time slots, said time slots being common for each of the simultaneous analog signals, said apparatus comprising:

a) a plurality of pre-amplifiers connected in parallel, each pre-amplifier providing a different level of pre-amplification for the plurality of information waves received simultaneously in each time slot;
b) a plurality of signal power level detectors, each power level detector being connected in series with a pre-amplifier and receiving the plurality of pre-amplified information waves in each time slot from the connected pre-amplifier, and each power level detector measuring the power level of the plurality of pre-amplified information waves it receives in each time slot;
c) a timing control circuit which determines the time period during which each information wave will be admitted to the pre-amplifiers and determines which of the pre-amplified signals from the power level detectors is of an appropriate power level for further processing;
d) an address storage circuit which provides time slot allocations to the timing control circuit;
e) a multiplex circuit which receives the pre-amplified information wave signals from each of the power level detectors and passes the simultaneous signals from only one pre-amplifier during each allocated time slot;
f) a multi-level impulse filter circuit for separating the combined analog signals received, said filter circuit comprising
(1) a plurality of signal delay circuits connected in parallel,
(2) a plurality of delay signal switches, each said switch being connected in series with a signal delay circuit, and
(3) a plurality of narrow bandpass filters connected in parallel to each other and connected together in series with each of the delay signal switches;
g) a plurality of final switch circuits, each final switch circuit being connected in series with a narrow bandpass filter, said final switch circuits passing the pre-amplified, separated and filtered information waves received in each time slot;
and
h) a timing circuit which establishes the proper timing of the impulse filter operations;
i) a plurality of power level detectors, each power level detector being connected in series with a final switch circuit, and determining the power level of each of the plurality of separated information waves in each time slot;
j) a plurality of analog to digital convertors for converting the separated and filtered information waves received in each time slot to digital;
and
k) an output signal generator for generating an output digital signal, for each converted information wave, with a magnitude which is a function of the digital magnitude of the converted information wave.

13 more elements

Communications method and apparatus for digital information

Life of this patent

Communications method and apparatus for digital information

Life of this patent

Abstract

Claims197