Automatic FM sideband level control for video recorders

Details Automatic FM sideband level control for video recorders Automatic FM sideband level control for video recorders

1986-05-01

1989-01-03

Richardson, Robert L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358330, 360 25, 360 67, 360 68, H04N 578, G11B 504

Patent

active

047961015

ABSTRACT:
The invention relates to a circuit arrangement for a video playback apparatus, comprising a band-pass filter arranged after the video heads in the luminance-signal playback channel. The frequency characteristic of the band-pass filter is variable in order to influence the amplitude characteristic of the FM sideband spectrum. The band-pass filter is followed by an FM demodulator and a crispening circuit. The frequency characteristic of the band-pass filter is controlled automatically depending on the level of the high-frequency components in the demodulated luminance signal in that the frequency characteristic of the band-pass filter is varied by means of a pre-emphasised luminance signal taken from the crispening circuit in such a way that a luminance signal whose FM spectrum in substantially amplitude-symmetrical relative to the FM carrier frequency is produced on the output of the band-pass filter.

REFERENCES:
patent: 4303952 (1981-12-01), Yamamitsu et al.
patent: 4370681 (1983-01-01), Akagiri
patent: 4484237 (1984-11-01), Muto

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