Trap circuit apparatus for television receiver

Details Trap circuit apparatus for television receiver Trap circuit apparatus for television receiver

1992-01-29

1995-01-03

Groody, James J.

Television

Receiver circuitry

348736, H04N 544

Patent

active

053790782

ABSTRACT:
A trap circuit apparatus for a television receiver comprising: a first trap circuit for producing a first trapped video signal by reducing a component level of a sound detection signal included in and accompanied with a video detection signal from a tuner of the television receiver, frequencies of the video detection signal and the sound detection signal having a given relation therebetween; and a second trap circuit responsive to the first trapped video signal for producing a second trapped video signal by reducing a component level of a radio detection signal included in the video detection signal, frequencies of the video detection signal and the radio detection signal having a second given relation therebetween. This trap circuit apparatus prevents FM interference radio wave signal in addition to a sound signal accompanied with video detection signal from entering a video processing circuit, etc. In U.S.A., radio waves of FM broadcasting stations of channels CH 201 (carrier frequency: 88.1 MHz) to CH 220 (carrier frequency: 91.9 MHz) are assigned to a frequency band where a television radio wave of CH 6 (video carrier frequency: 83.25 MHz) is assigned, at a frequency interval of 200 KHz.

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patent: 5142371 (1992-08-01), Lehman

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