AGC apparatus concurrently satisfying sufficient impedance match

Details AGC apparatus concurrently satisfying sufficient impedance match AGC apparatus concurrently satisfying sufficient impedance match

1995-10-30

1998-04-07

Burgess, Glenton B.

Television

Image signal processing circuitry specific to television

Gray scale transformation

348255, 348685, 4552341, 4552401, 330129, H04N 552

Patent

active

057370338

ABSTRACT:
An inexpensive AGC apparatus capable of concurrently satisfying a sufficient impedance matching characteristic and a linear AGC characteristic is provided. The AGC apparatus is provided with a linear correction circuit. The linear correction circuit corrects a control voltage from a control voltage generator circuit, and outputs a corrected control voltage to a variable gain amplifier circuit. The above-mentioned correction is such a correction that a variation of a decibel value of an AGC gain relative to a variation of the control voltage is linearized.

REFERENCES:
patent: 4517526 (1985-05-01), Di Cicco
patent: 4546326 (1985-10-01), Van Uffelen et al.
patent: 4591796 (1986-05-01), Muller-Girard et al.
patent: 4799106 (1989-01-01), Moore et al.
patent: 4970594 (1990-11-01), Kitaura et al.
patent: 4989074 (1991-01-01), Matsumoto
patent: 5089890 (1992-02-01), Takayama
patent: 5194822 (1993-03-01), Bureau et al.

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