Four-channel stereo receiver

Details Four-channel stereo receiver Four-channel stereo receiver

1975-07-21

1977-03-22

Olms, Douglas W.

1791004ST, H04H 500

Patent

active

040138410

ABSTRACT:
A four-channel stereo receiver capable of making the four-channel indication, and automatically changing over the four-channel mode operation and the two-channel mode operation or muting the monaural and the two-channel signal, based on the presence or absence of at least one of the second and the third sub-channel signals, and the second pilot signal included in the four-channel composite signal but not in the two-channel composite signal.

REFERENCES:
patent: 3569633 (1971-03-01), Brahman
patent: 3573382 (1971-04-01), Feit et al.
patent: 3617641 (1971-11-01), Feit et al.
patent: 3662113 (1972-05-01), Vonrecklinghausen
patent: 3679832 (1972-07-01), Halpern
patent: 3708623 (1973-01-01), Dorren
patent: 3711652 (1973-01-01), Metro
patent: 3721766 (1973-03-01), Hilbert
patent: 3754099 (1973-08-01), Takaoka
patent: 3787629 (1974-01-01), Limberg

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