Keyed noise filter in a television receiver

Details Keyed noise filter in a television receiver Keyed noise filter in a television receiver

1980-04-21

1981-10-13

Richardson, Robert L.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358172, 358168, H04N 912

Patent

active

042951615

ABSTRACT:
A video signal channel in a television receiver includes a keyed filter, followed by a keyed automatic brightness control circuit for establishing a desired black or blanking level for the video signal. The brightness control circuit operates during blanking intervals of the video signal to sense the blanking level of the video signal for deriving a control signal which is utilized to maintain a desired blanking level. The filter comprises a high-pass filter circuit which is decoupled for filtering purposes during image intervals, but is coupled to the video channel during the blanking intervals for suppressing high frequency signals including noise, when present, in the video channel during the blanking intervals. The sensed blanking level and the control voltage are therefore unaffected by noise components which would otherwise impair the control signal and thereby the operation of the brightness control circuit.

REFERENCES:
patent: 3544714 (1970-12-01), Stoll
patent: 3927255 (1975-12-01), Yorkanis
patent: 3949165 (1976-04-01), Lynch
patent: 3976836 (1976-08-01), Wheeler
patent: 4044375 (1977-08-01), Norman
patent: 4110790 (1978-08-01), Wheeler
patent: 4197557 (1980-04-01), Tuma et al.

Affiliated with

Also associated with

Rating

Keyed noise filter in a television receiver does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Keyed noise filter in a television receiver, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Keyed noise filter in a television receiver will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-934120