Video signal processing system with offset sound trap

Details Video signal processing system with offset sound trap Video signal processing system with offset sound trap

1986-02-28

1987-04-21

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358196, H04N 562

Patent

active

046600876

ABSTRACT:
A first sound filter in a video IF channel of a television receiver exhibits a null response at a frequency slightly less than the 41.25 MHz sound IF carrier signal frequency. A demodulated baseband video signal is filtered by a second sound filter which exhibits a null response at a frequency slightly less than the 4.5 MHz intercarrier sound frequency. The first sound filter provides a nominal amount of attenuation of the sound carrier signal in the video IF channel, while conserving high frequency information as ultimately manifested in the demodulated baseband video signal. The second sound filter assists the first sound filter to assure that sound information is adequately attenuated in the baseband video signal.

REFERENCES:
patent: 4490743 (1984-12-01), Mycynei
patent: 4551756 (1985-11-01), Ogawa
patent: 4562472 (1985-11-01), Carlson
patent: 4602287 (1986-07-01), Fockens
Technical data sheet for Sanyo SAW filter type TSB 2201.

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