Video signal clamping with clamp pulse width variation with nois

Details Video signal clamping with clamp pulse width variation with nois Video signal clamping with clamp pulse width variation with nois

1986-04-11

1987-11-17

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358167, 358172, 307542, H04N 518, H04N 5213

Patent

active

047077417

ABSTRACT:
A video signal clamping arrangement is provided for periodically clamping a predetermined nonpicture portion of a video signal, having picture portion and predetermined nonpicture portions, to a desired reference level with a clamp time duration varying as a function of noise on the video signal. A noise detector is employed for providing a noise level signal representative of the average noise level on the video signal during a predetermined nonpicture portion thereof. A controllable switch is employed for purposes of completing a clamping circuit for clamping the video signal to a desired signal level. A clamp pulse timing circuit responds to the noise level signal for providing a switch control signal for controlling the switch on time duration as a function of the magnitude of the noise level signal.

REFERENCES:
patent: 4415929 (1983-11-01), Yoshisato
patent: 4516042 (1985-05-01), Nakamura

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