Demodulating system for multivoice system

Details Demodulating system for multivoice system Demodulating system for multivoice system

1986-10-01

1988-02-02

Isen, Forester W.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

381 13, 358144, H04H 500

Patent

active

047232870

ABSTRACT:
A demodulating system for the multivoice TV system, which is constituted so that a tuner is tuned to receive the sum signal and the difference signal of an aural signal and a pilot signal which are transmitted together with a video signal, the selected signal is given to an intercarrier demodulator and an aural signal band-pass filter, the intercarrier demodulator provides a beat signal corresponding to the difference between the video carrier and the sound subcarrier, the beat signal is demodulated to obtain the sum signal, and the sound subcarrier provided by the sound signal band-pass filter is demodulated to obtain the difference signal and the pilot signal. The demodulating system is intended to eliminate disturbing signals included in the composite signal and buzzing, and to obviate the malfunction of the MPX decoder due to the disturbing signal having the same frequency as that of the pilot signal.

REFERENCES:
patent: 3659041 (1972-04-01), Kitaoka et al.
patent: 4272788 (1981-06-01), Ogita
patent: 4368354 (1983-01-01), Forihata et al.
patent: 4496979 (1985-01-01), Yu et al.
patent: 4577226 (1986-03-01), Avins
patent: 4603349 (1986-07-01), Robbins
patent: 4611226 (1986-09-01), Buhse et al.
patent: 4646150 (1987-02-01), Robbins et al.

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