Auto-pedestal level clamp circuit

Details Auto-pedestal level clamp circuit Auto-pedestal level clamp circuit

1986-05-20

1988-03-01

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358172, H04N 518, H04N 520

Patent

active

047290269

ABSTRACT:
An auto-pedestal level clamp circuit, which clamps a pedestal level of a television signal input through a DC blocking capacitor using a pedestal level clamp switch to automatically adjust the pedestal level, includes a level detecting circuit for detecting a luminance signal level of the television signal, and an A/D converter for judging a luminance of a frame based on the output from the level detecting circuit. The level detecting circuit includes first and second gates, first and second switches controlled by the first and second gates, and a smoothing circuit. The pedestal level of the television signal input to the level detecting circuit through the pedestal level clamp switch is adjusted based on an integral potential level of the output from the A/D converter.

REFERENCES:
patent: 4013833 (1977-03-01), Zimmerman
patent: 4369466 (1983-01-01), Matsuzaki
patent: 4403254 (1983-09-01), Okada
patent: 4473846 (1984-09-01), Mackereth

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