Television sound signal processor

Details Television sound signal processor Television sound signal processor

1985-10-23

1987-01-27

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

455307, H04N 562

Patent

active

046397868

ABSTRACT:
An IF signal filter in the IF sound channel of a television receiver exhibits peak amplitude responses which are unsymmetrical and slightly offset from the nominal picture and sound carrier frequencies by an amount dictated by the amount of tilt introduced by the tuner and the IF signal processing section. As a result, a filtered IF signal applied to a sound demodulating system exhibits a substantially symmetrical characteristic with respect to both the sound and picture carrier frequencies, yielding reduced audio buzz and harmonic distortion.

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M. Rehak, H. Kriedt, A Quasi-Parallel Audio Channel for Interference-Free Television Audio Signals, Mar. 30, 1979, 349-352.
J. Yamada, M. Uematsu, New Color TV Receiver with Composite SAW IF Filter Separating the Sound and Picture Signals, Aug. 1982, 192-194.
Service Data for RCA Color Television Receiver CTC-131 (file 1984, CTC-131, RCA Corp., Indianapolis, Indiana).

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