Digital automatic gain control apparatus

Facsimile and static presentation processing – Static presentation processing – Attribute control

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Details

358 27, 358174, 455234, 455240, H04N 964, H04N 552, H04B 106, H04B 700

Patent

active

049890743

ABSTRACT:
A digital automatic gain control apparatus is provided which controls gain such that when an analog video signal is converted into digital signals for processing, the input of the A-D converter is maintained at a fixed level, and after the analog signal has been converted into digital form, the output of the digital system circuit is also maintained at a fixed level. In this apparatus, an input signal is passed through an analog variable gain amplifier, the signal is converted into digital form, and the output of an A-D converter is passed through a digital variable gain amplifier. The amplitude level of the output of the digital variable gain amplifier is detected by an amplitude detecting unit and is controlled so as to be equal to a specified reference value. At this time, the analog variable gain amplifier is controlled so that the level of the control signal for controlling the digital variable gain amplifier is equal to a specified reference value, thereby maintaining the signal of the A-D converter at a fixed level. Gain control of the analog signal system and the digital signal system, before and after the A-D converter, is effected by a single amplitude detecting unit.

REFERENCES:
patent: 4625240 (1986-11-01), Yablonski et al.
patent: 4673970 (1987-06-01), Matsumoto et al.
patent: 4829593 (1989-05-01), Hara

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