Auto-master pedestal control circuit

Details Auto-master pedestal control circuit Auto-master pedestal control circuit

1989-02-13

1990-06-12

Shepperd, John W.

Facsimile and static presentation processing

Static presentation processing

Attribute control

358 32, H04N 972

Patent

active

049337505

ABSTRACT:
An auto-master pedestal control circuit is provided in which a master pedestal detector includes an amplifier, clamping circuit and integration circuit. The master pedestal detector detects a NAM video signal applied through an input terminal, and produces a direct current signal with a constant level. A logic operator (MICOM) compares a detected pedestal level with an internal predetermined reference level. A master pedestal controller adjusts a gain of a video signal which is composed of outputs of the logic operator and an amplifier. The amplifier is used for amplifying the inputted video signal.

REFERENCES:
patent: 3283067 (1966-11-01), Bazin et al.
patent: 3548083 (1970-12-01), Cahen
patent: 3651248 (1972-03-01), Schnerder
patent: 4489349 (1984-12-01), Okada

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