Production of modulation signals from audio frequency sources to

Details Production of modulation signals from audio frequency sources to Production of modulation signals from audio frequency sources to

1977-05-02

1978-12-05

Martin, John C.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 81, 340148, 340171A, H04N 146, H04N 902, H04Q 902

Patent

active

041288467

ABSTRACT:
Disclosed are apparatus and method for modulating color contributions in visual displays with audio modulating signals. Particular embodiments disclosed separate input audio frequency signals into modulating signals characterized by particular frequency ranges. At least one such modulating signal is operated on by a gating circuit controlled by enabling signals from a voltage controlled oscillator. A level detector samples the modulating signal and feeds control signals to the voltage controlled oscillator in response to values of amplitude detected in the modulating signal. Generation and processing of the modulating signals may be provided as part of a visual display system such as a color television receiver or eidophor system, or such signals may be transmitted through the antenna input of such a system. Each electron gun in the visual display system is then modulated by a different modulating signal, resulting in varied color displays in response to the frequency and magnitude of the input audio frequency signals.

REFERENCES:
patent: 2804500 (1957-08-01), Giacoletto
patent: 2982814 (1961-05-01), Fine et al.
patent: 3604852 (1971-09-01), Weintraub
patent: 3723652 (1973-03-01), Alles et al.
patent: 3969972 (1976-07-01), Bryant
patent: 3990105 (1976-11-01), Fast

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