1973-09-28
1976-03-16
Olms, Douglas W.
H04H 500
Patent
active
039447472
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: 3679832 (1972-07-01), Halpern
patent: 3708623 (1973-01-01), Dorren
patent: 3754099 (1973-08-01), Takaoka
patent: 3787629 (1974-01-01), Limberg
patent: 3789323 (1974-01-01), Anderson
Quadrature Ambience With Reference Tone by Gerzon Radio-Electronics, Dec. 1970, pp. 52, 53, 58.
"Militplex Methods for FM Broadcast Transmission of Four-Channel Stereo Signals" by Halstead & Feldman, Journal AES Dec. 1970.
O'Connor Cornelius J.
Olms Douglas W.
Zenith Radio Corporation
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