US 5,400,082 A · Device for reducing noise in a composite video signal

Abstract

A device for reducing noise includes a first delay circuit for producing a first delay signal which is spacewise continuous to a current signal, a second delay circuit for producing a second delay signal which is timewise continuous to the current signal, first and second signal coincidence judging circuits for comparing the current signal with the first and second delay signals at a smapling period and judging whether or not difference in level between the current signal and the first and second delay signals is below a predetermined value continuously for a predetermined number of samples, and a conditional averaging circuit for providing, when it has been judged by the first or second signal coincidence judging circuit that the condition that difference in level between the current signal and the first or second delay signals is below the predetermined value continuously for the predetermined number of samples has been satisfied, an output signal which is an average value of one or both of the delay signals satisfying said condition and the current signal and providing, when there is no delay signal satisfying said condition, the current signal as an output signal thereof. Video S/N and color S/N of signals reproduced from video disc player etc. can be improved in the stage of a composite video signal.

Claims15

Dependent claims

A device for reducing noise in a composite video signal comprising:

first delay means for producing a first delay signal which is spacewise continuous to a current signal;
second delay means for producing a second delay signal which is timewise continuous to the current signal;
first correlation detection means for detecting a correlation between the current signal and the first delay signal;
second correlation detection means for detecting a correlation between the current signal and the second delay signal;
conditional averaging means for providing, when a correlation is detected by at least one of said first and second correlation detection means, an output signal which replaces said current signal with an average value of a corresponding delay signal and the current signal and, when no correlation is detected, the current signal as an output signal thereof.

2 more elements

A device for reducing noise in a composite video signal comprising:

first delay means for producing a first delay signal which is spacewise continuous to a current signal;
second delay means for producing a second delay signal which is timewise continuous to the current signal;
first correlation detection means for detecting a correlation between the current signal and the first delay signal;
second correlation detection means for detecting a correlation between the current signal and the second delay signal;
conditional averaging means for providing, when a correlation is detected by at least one of said first and second correlation detection means, an output signal which replaces said current signal with an average value of a corresponding delay signal and the current signal and, when no correlation is detected, the current signal as an output signal thereof;
wherein said first correlation detection means comprises first signal coincidence judging means for comparing the current signal with the first delay signal and for judging whether or not different in level between the current signal and the first delay signal is below a predetermined value, said first correlation detection means detecting the correlation when it is judged by said first signal coincidence judging means that a condition that difference in level between the current signal and the first delay signal is below the predetermined value is satisfied;
and
said second correlation detection means comprises second signal coincidence judging means for comparing the current signal with the second delay signal and for judging whether or not difference in level between the current signal and the second delay signal is below a predetermined value, said second correlation detection means detecting the correlation when it is judged by said second signal coincidence judging means that a condition that difference in level between the current signal and the second delay signal is below the predetermined value is satisfied.

5 more elements

Dependencies are inferred from the claim text.

Device for reducing noise in a composite video signal

Life of this patent

Device for reducing noise in a composite video signal

Life of this patent

Abstract

Claims15