Dictionary:Automatic gain control (AGC)

From SEG Wiki
Revision as of 12:40, 17 October 2016 by FuzzyBot (talk | contribs) (Updating to match new version of source page)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search
Other languages:

A system in which the output amplitude is used for automatic control of the gain of an amplifier. Seismic amplifiers used to have individual AGC for each channel, although multichannel control was sometimes used. See Figure A-25 and gain control. Also called automatic volume control (AVC).

FIG. A-25. Automatic gain control (AGC) action. (a) Input; (b) output. AGC gradually restores the output to the same level after an increase or decrease in input amplitude.