Carrier frequency sound transmission system

Details Carrier frequency sound transmission system Carrier frequency sound transmission system

1978-05-04

1980-06-24

Moffitt, James W.

Multiplex communications

Wide area network

Packet switching

370 74, H04J 100

Patent

active

042096642

ABSTRACT:
A carrier frequency sound transmission system which utilizes sound channels which correspond approximately to the bandwidth of three separate telephone channels and wherein a pilot tone is added to each of the sound channels and four sound channels are transmitted on a suitable carrier to a receiver where the pilot tone is utilized as an automatic frequency control signal to control a local injection oscillator for demodulating the four incoming sound channels.

REFERENCES:
patent: 2613279 (1952-10-01), Hurault
"Transmission Systems for Communications," Bell Telephone Laboratories, 1970, pp. 123-139.

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