Pulse or digital communications – Repeaters – Testing
Patent
1987-07-20
1989-10-24
Griffin, Robert L.
Pulse or digital communications
Repeaters
Testing
370111, H04J 316
Patent
active
048766968
ABSTRACT:
A transmission system for transmitting modem signals or multifrequency (MF) signals together with speech signals over the same digital transmission line. The system includes a transmitter which has a first coder that efficiently encodes a speech signal to produce a first coded output, a detector for detecting a multifrequency signal or modem signal, a second encoder which produces a second coded output from the multifrequency signal or modem signal, and a selector for selecting either the first or second coded output in response to the output of the detector. The transmission system also includes a receiver which has a separator for separating a signal transmitted from the transmitting means into the first and second coded outputs, a first decoder for decoding the first coded output and a second decoder for decoding the second coded output.
REFERENCES:
patent: 3304372 (1967-02-01), Filipowsky et al.
patent: 3735048 (1973-05-01), Tomsa et al.
patent: 4377860 (1983-03-01), Godbole
patent: 4449218 (1984-05-01), Strehl
Analog/Digital, Bipolar/CMOS Integrated Circuits Data Book, published 1968 by Silicon System, California, pp. 1-26 and 1-31.
Telecommunications Device Data, published 1985 by Motorola Inc., pp. 2-70 to 2-84 and 2-62 to 2-69.
Griffin Robert L.
Huseman Marianne
NEC Corporation
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