Multiple channel FM stereo system

Details Multiple channel FM stereo system Multiple channel FM stereo system

1975-12-24

1977-05-31

Olms, Douglas W.

H04H 500

Patent

active

040271072

ABSTRACT:
A transmitter or a receiver processes four-channel stereo frequency-modulation information. The information represents four audio signals A, B, C and D that correspond to sources respectively located at the left-front, right-front, left-rear and right-rear of a listening point. First and second sub-carrier signals .omega..sub.s and .omega..sub.s2 both have frequencies substantially higher than the highest audio signal component. In one disclosed embodiment all of the different signals are combined to develop a signal having a carrier signal frequency that is modulated by double-sideband amplitude-modulated suppressed-carrier sub-carrier signals as expressed by the modulation function

REFERENCES:
patent: 3708623 (1973-01-01), Dorren
patent: 3754099 (1973-08-01), Takaoka
patent: 3787629 (1974-01-01), Limberg
patent: 3814858 (1974-06-01), Parker
patent: 3881063 (1975-04-01), Mawake et al.
patent: 3934092 (1976-01-01), Csicsatka
"Quadrature Ambience", by Gerzon in Radio Electronics, pp. 52, 53, 58, Dec. 1970.
"Multiplex Methods for FM . . . Four Channel Stereo Signals", by Halstead et al., Journal A.E.S., vol. 18, No. 6, Dec. 1970, pp. 624-630.

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