Apparatus for eliminating a noise signal
First Claim
Patent Images
1. A circuit for eliminating a noise from a video signal comprising:
- first means for eliminating a noise from the video signal, said first means having a first-order circuit configuration;
detecting means for detecting a level in a relatively high frequency portion of the video signal, said detecting means generating a control signal during an interval in which said level is greater than a predetermined first threshold level; and
averaging means controlled by said control signal for averaging said video signal over a plurality of lines of the video signal during said interval.
1 Assignment
0 Petitions
Accused Products
Abstract
An apparatus for eliminating a noise from a video signal, employs a first-order type noise eliminating section, for example, a limiter or the like. Such noise eliminating section, by utilizing line correlation, eliminates noise from the video signal in a high frequency region where the signal component level is large, for example, at the portion of a video signal corresponding to an edge portion of the display or picture.
24 Citations
17 Claims
-
1. A circuit for eliminating a noise from a video signal comprising:
-
first means for eliminating a noise from the video signal, said first means having a first-order circuit configuration; detecting means for detecting a level in a relatively high frequency portion of the video signal, said detecting means generating a control signal during an interval in which said level is greater than a predetermined first threshold level; and averaging means controlled by said control signal for averaging said video signal over a plurality of lines of the video signal during said interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A circuit for eliminating a noise from an incoming video signal comprising:
-
means for delaying an incoming video signal by a predetermined number of horizontal lines to form a delayed video signal; means for deriving a difference signal corresponding to a difference between the incoming video signal and the delayed video signal; limiting means for limiting said difference signal to produce a limited difference signal; means for subtracting the limited difference signal from the incoming video signal; detecting means for detecting a level change of the incoming video signal and a line correlation of said level change is adjacent lines of the incoming video signal, said detecting means generating a control signal when the level change exceeds a predetermined level and the level changes in the adjacent lines indicate the line correlation; and means for changing the limiting level of said limiting means in accordance with said control signal. - View Dependent Claims (13, 14, 15, 16, 17)
-
Specification