Plural channel communications system

Details Plural channel communications system Plural channel communications system

1973-12-03

1976-02-17

Libman, George H.

Telegraphy

Systems

Printing

178 67, 179 15BM, H04L 702

Patent

active

039394077

ABSTRACT:
A system for communicating a data channel composed of a multiplicity of telephone-type messages wherein the invention incorporates circuitry for modulating service channel data onto a carrier of the telephone channel data and for demodulating the service data without interfering with the telephone data. An inverse modulator driven by detected telephone data is utilized to recover a carrier which is then tracked by a tracking filter to recover the service data.

REFERENCES:
patent: 3160812 (1964-12-01), Scantlin
patent: 3427543 (1969-02-01), Ito
patent: 3773979 (1973-11-01), Kirk et al.
Bennett et al., Data Transmission, 1965, pp. 252-254.

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