Circuit for increasing a signal slope of a periodically occurrin

Details Circuit for increasing a signal slope of a periodically occurrin Circuit for increasing a signal slope of a periodically occurrin

1978-11-14

1980-12-23

Murray, Richard

Facsimile and static presentation processing

Static presentation processing

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358164, 307229, 328142, H04N 953

Patent

active

042413621

ABSTRACT:
A circuit for increasing, mainly near a reference level, a signal slope of a periodically occurring signal, particularly at the black level of a television picture signal. To this end the gamma-corrected and limited luminance signal is applied in a color television camera to a first input of a differential amplifier, a second input of which is connected to a reference potential, the amplifier output being connected via a signal limiting circuit arranged in series with a first and a second resistor, respectively, to the first amplifier input and the reference potential, respectively. The junction of the resistors supplies the correction signal which increases the signal slope but does not effect either the black level or the peak-white value.

REFERENCES:
patent: 3793480 (1974-02-01), Waehner
patent: 4018988 (1977-04-01), Seer, Jr.
patent: 4041531 (1977-08-01), Bingham

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