Simultaneous analog and digital communication

A method for communicating a digital signal together with a bandlimited analog signal, where the digital signal is represented by a sequence of symbols and the analog signal is represented by a sequence of samples, comprising the steps of:

• converting each of the symbols into a base multi-dimensional signal element;
• joining groups of said samples and converting each such group into an additive multi-dimensional signal element;
• combining the additive multi-dimensional signal elements with the base multi-dimensional signal elements to form combined multi-dimensional signal elements;
• modulating the combined multi-dimensional signal elements signal to form a modulated signal;
• and
• transmitting the modulated signal.

A method for communicating a digital signal together with a bandlimited analog signal, where the digital signal is represented by a sequence of symbols and the analog signal is represented by a sequence of samples, comprising the steps of:

• converting each of the symbols into component signals x.sub.d and y.sub.d ;
• identifying pairs of samples in the sequence of samples representing the analog signal and converting each such pair into component signals x.sub.a and y.sub.a ;
• forming super symbols by creating x=x.sub.a +x.sub.d and y=y.sub.a +y.sub.d component signals;
• modulating the x and y component signals to form a modulated signal;
• and
• transmitting the modulated signal.

A method for communicating a digital signal represented by a sequence of symbols, and a bandlimited analog signal represented by a sequence of samples, comprising the steps of:

• converting each of the symbols into a set of N base signals, where N is a preselected integer greater than 1;
• joining said samples into groups of N samples each, and converting each such group into a set of N additive signals;
• forming combinations of the sets of N additive signals and the sets of N base signals, to form super symbols formed of sets of N signals;
• and
• modulating each set of N signals of the super symbols with a carrier from a set of N mutually orthogonal carrier signals.

A method for transmitting a digital data signal and a bandlimited analog signal, comprising the steps of:

• creating a symbol representative of a number of bits of the digital data signal,
• mapping said symbol into a first component signal and a second component signal,
• obtaining a first sample and a second sample of the bandlimited analog signal,
• adding the first sample to the first component signal to form a first added signal,
• modulating the first added signal with a first carrier signal,
• adding the second sample to the second component signal to form a second added signal, and
• modulating the second added signal with a second carrier signal, which carrier signal is orthogonal to the first carrier signal.

A method for receiving a signal that concurrently contains both a digital signal and an analog signal, comprising the steps of:

• demodulating a received signal to form a plurality of combined component signals,
• detecting digital signal components contained within the combined component signals,
• de-mapping at least some of the digital signal components to form a stream of digital signals, and
• subtracting at least some of the detected digital signal components from the combined component signals to develop component analog signals.

A method for receiving a signal that concurrently contains both a digital signal and an analog signal, comprising the steps of:

• demodulating a received signal to form a plurality of combined component signals,
• detecting digital signal components contained within the combined component signals,
• de-mapping the digital signal components to form a stream of digital signals,
• subtracting the detected digital signal components from the combined component signals to develop component analog signals, and
• de-mapping the component analog signals to form an output analog signal.

A method for receiving a signal that concurrently contains both a digital signal and an analog signal, comprising the steps of:

• demodulating a received signal to form component signals,
• detecting symbols in the component signals,
• de-mapping the symbols to form a stream of digital signals,
• mapping the symbols to form digital component signals,
• subtracting the digital component signals from the component signals obtained from the step of demodulating, to form component analog signals, and
• de-mapping the component analog signals to form an output analog signal.

A modem comprising:

• a signal mapper having a digital signal applied to the mapper at a digital port and an analog signal applied to the mapper at an analog port,
• a modulator, responsive to the Signal mapper, for developing a modulated output signal at an output port of the modulator representable by an N-dimensional signal space, where N is greater than 1, that is composed of a plurality of N-dimensional enclosed spaces with a predetermined point in each of the spaces associated with a digital symbol applied to said mapper via the applied digital signal, and other points in each of the spaces associated with the analog signals applied to said signal mapper,
• means for coupling the output port of the modulator to an output port of the modem, and
• selection means having inputs A and B and outputs A and B, where output A is an analog output that is connected to the analog port and output B is a digital output that is connected to the digital port, responsive to an analog input signal at input A and a digital input signal at input B, for selectively applying the signals at input A and input B to the analog input port and the digital input port, to form an output signal at the output port of the modem which represents
• the analog signal at input A and not the digital signal at input B,
• the digital signal at input B and not the analog signal at input A,
• the analog signal at input A as well as the digital signal at input B.

A modem comprising:

• a first mapper responsive to a digital signal,
• a second mapper responsive to an analog signal,
• an orthogonal modulator concurrently responsive to output signals of the first mapper added to output signals of the second mapper to develop an output signal,
• a hybrid having a first port that receives the output signal developed by the orthogonal modulator, said hybrid communicating substantially all of the signals received at the first port to a second port of the hybrid,
• an echo canceller coupled to a third port of the hybrid, for subtracting from the third port a portion of the signal applied to said first port of the hybrid,
• a demodulator responsive to output signals of the echo canceller,
• a slicer for detecting digital signal components contained in output signals developed by the demodulator,
• a first de-mapper for forming a stream of digital signals in response to output signals of the slicer,
• means for subtracting the detected digital signal components from the signals developed by the demodulator, to develop thereby component analog signals, and
• a second de-mapper for forming analog signal from output signals of the means for subtracting.

A modem including a transmitter carrier frequency rotator, two Hilbert passband transmitter filters responsive to the transmitter carrier frequency rotator, having their outputs summed and applied to a hybrid circuit, an echo canceller responsive to the transmitter carrier frequency rotator and to an output of the hybrid circuit, for developing an echo-canceled received signal, two additional Hilbert passband receiver filters responsive to the echo-canceled received signal, a receiver carrier frequency rotator responsive to the two Hilbert passband receiver filters, an equalizer responsive to the receiver carrier frequency rotator, and a carrier phase corrector responsive to the equalizer, THE IMPROVEMENT COMPRISING:

• an analog signal mapper responsive to applied analog signals for applying a first input signal to the transmitter carrier frequency rotator,
• a digital signal mapper responsive to applied digital signals for applying a second input signal to the transmitter carrier frequency rotator,
• a digital signal detector responsive to output signals of said carrier phase corrector for developing a digital output signal and subtraction signals,
• means for combining the subtraction signals with the output signals of the carrier phase corrector, and
• a de-mapper responsive to the means for combining, for developing analog output signals.