Noise reducing apparatus

Details Noise reducing apparatus Noise reducing apparatus

H - Electricity

04

N

H04N 9/64 (2006.01) H04N 5/21 (2006.01)

Patent

CA 2132142

A noise reducing apparatus includes a delay device for delaying a first video signal by one horizontal period. Also included is a first subtracter for subtracting the output of the delay device from an input video signal and a limiter for clipping the output of the first subtracter at a designated level. A variable coefficient multiplier is also provided for multiplying the output of the limiter by a variable coefficient k where 0<k<1. A second subtracter subtracts the output of the variable coefficient multiplier from the input video signal and an adder adds the output of the first subtracter and the output of the limiter. A coefficient multiplier is also provided for multiplying the output of the adder by a fixed value 0.5. A third subtracter subtracts the output of the coefficient multiplier from the input video signal and a correlation detector provides a signal to control the coefficient value of the variable coefficient multiplier in response to the output of the first subtracter.

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