Non-linear dynamic coring circuit for video signals

Details Non-linear dynamic coring circuit for video signals Non-linear dynamic coring circuit for video signals

H - Electricity

04

N

350/81

H04N 5/14 (2006.01) H04N 5/20 (2006.01) H04N 5/21 (2006.01)

Patent

CA 1216665

Abstract In a television receiver, a horizontal peaking signal produced by a peaking signal generator is added to a luminance signal to accentuate its horizontal detail. The peaking signal is subject to a coring action from a control voltage source with the amount of coring subject to dynamic control as a function of luminance signal content. The sense of coring control is such that a greater amount of coring is associated with dark portions of a scene to be reproduced than is associated with bright portions thereof. The coring control is non-linear and exhibits one control characteristic over a first range of luminance signal levels between a white image limit and a threshold level in the black image direction, and a different control characteristic over a second range of signal levels between the threshold level and the black image limit for restricting the amount of coring produced as the black limit is approached.

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