Detecting circuit which reduces buzz in a sound signal

Details Detecting circuit which reduces buzz in a sound signal Detecting circuit which reduces buzz in a sound signal

1989-06-14

1991-05-21

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358167, H04N 562

Patent

active

050180169

ABSTRACT:
A television receiver includes a correction filter (10) having an inclination characteristic opposite to a slope of a video intermediate frequency signal. The video intermediate frequency signal correction by the correction filter is applied to a PLL circuit (11) and the PLL circuit generates a carrier signal of a video intermediate frequency locked to the video intermediate frequency signal. A synchronous detecting circuit (16) detects the video intermediate frequency signal before the correction in response to the signal output from the PLL circuit and outputs a video signal. At the same time, it generates a sound FM signal corresponding to a beat of the carrier signal of the video intermediate frequency and a carrier signal of a sound intermediate frequency. A sound detecting circuit (20) detects the sound FM signal and outputs a sound signal.

REFERENCES:
patent: 4253118 (1981-02-01), Flasza
patent: 4511924 (1985-04-01), Griffis et al.
patent: 4513323 (1985-04-01), Patel
patent: 4551756 (1985-11-01), Ogawa et al.
patent: 4602287 (1986-07-01), Fockens
patent: 4630119 (1986-12-01), Okuno
patent: 4716464 (1987-12-01), Parker
patent: 4811096 (1989-03-01), Gakumura
patent: 4933767 (1990-06-01), Hyakutake

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