Audio multiplex television tuner

Details Audio multiplex television tuner Audio multiplex television tuner

1986-05-09

1988-04-12

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

H04H 500

Patent

active

047379910

ABSTRACT:
In a sound multiplex television tuner, when the input field strength becomes smaller than a certain value, a level control means continuously attenuates the sub signal demodulation output with the aid of the field strength detection signal which a field strength detector circuit provides according to the input field strength. The characteristic of response to input field strength of the level control means is switched, according to a given sound multiplex mode, so that its operation becomes most suitable for the sound multiplex mode, thereby to suppress the noise without causing the television viewer to feel a sense of incongruity in the perceived sound.

REFERENCES:
patent: 4032717 (1977-06-01), Mallon
patent: 4157455 (1979-06-01), Okatani et al.
patent: 4379207 (1983-04-01), Kubota
patent: 4408098 (1983-10-01), Kamalski

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