Dynamically controlled horizontal peaking system

Details Dynamically controlled horizontal peaking system Dynamically controlled horizontal peaking system

H - Electricity

04

N

350/83

H04N 5/14 (2006.01) H04N 5/208 (2006.01)

Patent

CA 1201801

Abstract of the Disclosure In a system for enhancing horizontal detail of a luminance signal, a horizontal peaking signal to be added to the luminance signal is cored with the depth of coring varied in accordance with a coring control potential. To develop the coring control potential, the input luminance signal is capacitively coupled to the input of a signal translator comprising an inverting amplifier with a frequency selective negative feedback path providing the translator with a low pass characteristic and a signal delay substantially equal to the delay of a delay line employed in peaking signal formation. An additional feedback path is provided by the emitter-collector path of a clamping transistor that conducts in response to sync pulse appearances to readjust the charge on the input capacitor, clamping the sync pulse peaks to a potential selected to establish a desired coring depth for black scene regions. Amplifier gain is set to provide translator output swing establishing a desired minimum coring depth (e.g., zero) for peak white scene regions.

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