Amplitude modulated telephone carrier systems

Details Amplitude modulated telephone carrier systems Amplitude modulated telephone carrier systems

1977-01-28

1978-05-02

Stewart, David L.

179 15AN, 179 15FD, 179 15FE, H04J 112

Patent

active

040876390

ABSTRACT:
A plural channel amplitude modulated telephone carrier system having a plurality of transmitters to provide for the transmission of a like plurality of frequency division multiplexed, amplitude modulated carrier signals in a common direction along a transmission line to a remote termination of the transmission line, and an automatic carrier level coordination control circuit having a first circuit means for developing a d.c. control signal that varies as a predetermined function of the transmission line length, and a second circuit means connected to the first circuit means for controlling the transmit power of each of the aforesaid carrier signals as a function of its own carrier frequency and as a function of the d.c. control signal. The telephone carrier system may be of the station carrier type and may have two or more plural channel amplitude modulated carrier sub-systems, each having its own transmission line. The automatic carrier level coordination control circuit is designed to be common to two or more of the carrier sub-systems.

REFERENCES:
patent: 2034857 (1936-03-01), Black
patent: 2695332 (1954-11-01), Caruthers
patent: 3103556 (1963-09-01), Nicholls
patent: 3475561 (1969-10-01), Krasin
patent: 3768021 (1973-10-01), Ramaswamy
SGA Station Carrier, Description and Application Manual, Published by Anaconda Wire and Cable Company, Copyright 1970.
Transmission Systems for Communications by Staff, Bell Telephone Laboratories; vol. 1, pp. 13-1 to 13-26; Copyright 1959.

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