Noise reduction system for color television

Details Noise reduction system for color television Noise reduction system for color television

H - Electricity

04

N

350/81

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

Patent

CA 1078057

ABSTRACT OF THE DISCLOSURE A system for reducing noise in a color video signal which utilizes frame store integration and includes a delay or storage device for storing a single television frame, a summing device for adding a fractional amplitude portion of the signal stored in the storage device to a fractional amplitude portion of the present video signal, and a chromin- ance corrector circuit for altering the chrominance component of the stored signal so as to be in the proper phase relation- ship to be summed with the chrominance component of the present video signal. The system is operative automatically to change the fractional amplitude portion of the stored signal fed back to the summing device as a function of the difference between stored and present signals thereby to change the integration time constant of the system to accommodate for motion between the present signal and the stored frames. The system functions as a comb filter whose tines are very narrow when there is little or no motion between the present and stored frames and which are automatically widened to allow motion to be portrayed when there is relative motion between past and present signals.

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