Suppressed carrier communications system

Details Suppressed carrier communications system Suppressed carrier communications system

1982-09-29

1984-01-03

Masinick, Michael A.

Telecommunications

Transmitter and receiver at separate stations

Single or vestigial sideband system

455 63, 455 71, 455263, H04B 168

Patent

active

044245939

ABSTRACT:
A radio transmission system of the suppressed carrier type incorporating means for correcting frequency errors. The transmission circuit can include the usual components which first produce a carrier wave, an upper sideband, and a lower sideband. The carrier wave and one of the sidebands are eliminated and only the desired sideband is radiated. The transmitter also incorporates a highly selective circuit which substantially reduces the amplitude of all audio frequencies below about 350 hertz. This frequency characteristic is used as a frequency reference to regenerate the carrier wave in the receiving system. Since low frequencies of 350 hertz are not present in voice waves at all instances, a storage circuit is employed to store a control voltage during the absence of low frequency sounds which would have the identifying frequency step.

REFERENCES:
patent: 3147437 (1964-09-01), Crafts et al.
patent: 3271602 (1966-09-01), Bucher, Jr.
patent: 3271681 (1966-09-01), McNair
patent: 3286183 (1966-11-01), Bergemann
patent: 3634766 (1972-01-01), Boyer

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