Recursive noise-reducer

Details Recursive noise-reducer Recursive noise-reducer

H - Electricity

03

H

350/81, 328/0.5

H03H 17/02 (2006.01) H04N 5/21 (2006.01)

Patent

CA 1291540

ABSTRACT OF THE DISCLOSURE A recursive noise-reducer for a high-definition TV system. The noise-reducer includes an interpolation device for performing two-frame interframe interpolation on the input digital signal. A delay device delays the input digital signal by one frame period and two frame period. An output signal from the delay device is separated into a one-frame-preceding signal component and a two-frame-preceding signal component. A first subtracter derives a difference between the input digital signal and the one-frame-preceding signal component. A filter filters an output signal from the first subtracter and passes a signal component having a recursion with a period corresponding to one frame. A second subtracter derives a difference between the input digital signal and the two-frame-preceding signal component. An adder adds the input digital signal, an output signal from the filter, and an output signal from the second subtracter. The interpolation device operates to alternately select an output signal from the adder and the one-frame-preceding signal component and thereby to generate the interpolated signal from which noise components are effectively reduced.

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