Video signal processing circuit for noise reduction
AssigneeU.S. Philips Corporation
InventorsJohannes G. Raven, Marinus C. W. Van Buul
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Abstract
In a noise suppression circuit for a video signal the number of elements required can be reduced when a separation circuit (3) for a high-frequency and a low-frequency component is used and the noise suppression is effected in the low-frequency component by means of a comb filter (19) which, in order to realize a still further savings in components, may comprise a delay circuit having a delay (103, 105, 107) which is switchable between a field period plus half a line period and a field period minus half a line period. The noise suppression circuit is therefore particularly suitable for use in television receivers.
Claims5
A video signal processing circuit comprising a separation circuit having two outputs for providing separately a high-frequency and a low-frequency signal component from an input video signal to be processed and a noise suppression circuit which operates on one of the separated video signal components received from said separation circuit, characterized in that the noise suppression circuit is coupled to the low-frequency signal component output of said separation circuit and comprises a comb filter having a delay circuit and a combining circuit, an output signal of said delay circuit being added to said low-frequency video signal component in said combining circuit.
Dependencies are inferred from the claim text.