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US 5,963,588 AGranted
Apparatus for modulating/demodulating signals
AssigneeMotorola, Inc.
InventorsDavid Yatim, Jim Girardeau
Life of this patent
Estimating the term…
Abstract
An apparatus connects a data processing system (10) with an analog telephone line and/or an ISDN line. The apparatus modulates and demodulates data from the data processing system (10) to either of the two different telephone protocols without adding unnecessary expense or noise to the system.
Claims13
An apparatus for modulating/demodulating signals of a data stream between a first domain and either a second domain or a third domain, the apparatus comprising:
- a modulator further comprising;
- a first register, an input thereof receiving signals of a data stream;
- a second register, an input thereof coupled to an output of the first register, an output thereof outputting the data stream in a second domain;
- a digital-to-analog converter, an input thereof coupled to the output of the first register, an output thereof outputting the data stream in a third domain;
- and
- a demodulator further comprising;
- an analog-to-digital converter, an input thereof receiving signals from the third domain;
- a multiplexer, a first input thereof coupled to an output of the analog-to-digital converter and a second input thereof coupled to the signals from the second domain;
- a third register coupled to an output of the multiplexer, an output of the third register outputting the signals of the data stream to the first domain.
6 more elements
An apparatus for modulating/demodulating signals of a data stream between a first domain and either a second domain or a third domain, the apparatus comprising:
- a modem further comprising:
- a modulator itself further comprising;
- a first register, an input thereof receiving signals of a data stream;
- a second register, an input thereof coupled to an output of the first register;
- a first digital-to-analog converter, an input thereof coupled to the first register, an output thereof outputting the data stream in a second domain;
- a demodulator itself further comprising;
- a first analog-to-digital converter, an input thereof receiving signals from the second domain;
- a multiplexer, a first input thereof coupled to an output of the first analog-to-digital converter;
- a third register, an input thereof coupled to an output of the multiplexer, an output of the third register outputting the data stream to the first domain;
- and
- a network terminator further comprising:
- a second analog-to-digital converter, an input thereof receiving signals from a third domain;
- a digital signal processing means, a first input thereof coupled to an output of the second analog-to-digital converter, a second input thereof coupled to an output of the second register, a first output thereof coupled to a second input of the multiplexer, the digital signal processing means filtering the data stream;
- a second digital-to-analog converter, an input thereof coupled to a first output of the digital signal processing means, an output thereof outputting the data stream in the third domain.
11 more elements
Dependencies are inferred from the claim text.