Audio signal processing apparatus

Details Audio signal processing apparatus Audio signal processing apparatus

1975-10-10

1977-02-01

Olms, Douglas W.

179 1SW, 1791004ST, H04R 500

Patent

active

040063062

ABSTRACT:
Improved audio reproduction apparatus permits upgrading a two channel high fidelity ("stereo") system to four channel ("quadraphonic") capability, while flexibly accommodating varying four channel source signal formats, e.g., four channel discrete, or encoded two channel SQ (e.g., tape, FM) or CD-4 (phonograph). The composite arrangement includes demodulation circuitry for the variously formated incoming signals, and plural variable gain amplifier arrays for final signal source selection which is readily effected by off-board minimal, DC switching.

REFERENCES:
patent: 3493681 (1970-02-01), Richards
patent: 3686471 (1972-08-01), Takahashi
patent: 3708631 (1973-01-01), Bauer et al.
patent: 3806820 (1974-04-01), Uchiyama
patent: 3818136 (1974-06-01), Schott

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