Adjustable coring circuit

Facsimile and static presentation processing – Static presentation processing – Attribute control

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Details

358 31, 358 37, H04N 9535, H04N 514

Patent

active

044411219

ABSTRACT:
Signals to be cored are applied to the inputs of a linear signal amplifier, and of a multistage limiting amplifier having cascaded input and output amplifying stages. A cored version of the signals, corresponding to the difference between a linearly translated version of the signals and a doubly clipped version thereof, is developed by a signal combiner responsive to the outputs of both amplifiers. A variable coring level control voltage controls the distribution of gain between the input and output amplifying stages, substantially without disturbing the overall gain of the limiting amplifier, which is set to match the overall gain of the linear amplifier. In an illustrative embodiment, the signals which are adjustably cored are horizontal peaking signals derived from the received luminance signal in a color television receiver. An automatic peaking control system associated with output of the adjustable coring circuit opposes changes in peaking level that might otherwise accompany coring level adjustment.

REFERENCES:
patent: 3984865 (1976-10-01), Avins
patent: 4071782 (1978-01-01), Vidovic
patent: 4325076 (1982-04-01), Harwood

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