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AGC - Automatic Gain Control
By: Christine Martz
Meaning of AGC – “Automatic Gain Control”, A circuit which automatically normalizes the the output of an electronic component by boosting or lowering incoming signals to match a preset level so that that the output signal level is virtually constant.
If someone was singing into a microphone, the person's voice might vary from very loud at some moments, producing a stronger signal. Other parts of the song might require singing in a softer voice, which would produce a weaker signal. AGC would give weaker signals more gain and stronger signals either less gain or none at all.
ACG is used in modems, faxes, multiplexers as well as radios, CDROM drives, amplifiers and video.
Other Related Definitions:
“…In digital AGC systems, it is relatively easy to provide a variable threshold or "knee." Input signals below the threshold do not actuate the digital AGC and are not compressed. At thresholds well above the receiver noise floor, a receiver therefore gets quiet when only puny input signals are present in the passband. At thresholds near the noise floor, all signals are boosted to meet the output-level criterion. The net effect of a variable threshold is very much like that of an IF gain control.” [Adaptive Digital Technologies]
“… In audio recording, a circuit used to automatically control the volume of the recorded signal without distortion due to overload. An AGC-defeat control permits manual volume control for wide ranges and other special recording purposes. It is sometimes called automatic level control (ALC), or automatic volume control (AVC).” [Extron Electronics]
“…Automatic Gain Control (AGC) is a feature that adjusts the level of the recorded data to some nominal level. The AGC algorithm is implemented in the encoder subcomponent and is parameterized using a set of standard parameters.” [Dialogic Corporation]
“…Cisco Unity automatic gain control (AGC) gives subscribers consistent message playback levels through the normalization of recordings. AGC affects recordings only. It is on by default, is controlled by registry settings, and is applied to voice samples after they have passed through all external hardware. AGC does not improve the quality of recordings; it only addresses volume issues. For example, it cannot improve garbled incoming messages.” [Cisco Systems]
Related Links:
VIDEO 101: Sound - Automatic Gain Control.
Digital ACG for Radio Transceivers - Digital gain-control algorithms in a modern transceiver.
Wideband AGC has 60-dB dynamic input range - maintaining signals at fixed levels.
Technical Resources:
Understanding AFC/AGC - AGC lowers signal levels when powerful signals are hit.
A Design for Testability - Study on a High Performance Automatic Gain Controlhttp
AGC Loop Simulation - Shows simulations of a basic AGC loop.
Products and Solutions:
3-V IR Receiver Module
AGC Devices
Blogs, News, Feeds, Discussion Lists:
Books About:
Automatic gain control optimization in a radar tracking system - by by Richard Randolph Gillock.
Automatic gain control for an HF Doppler radar receiver - by J. D Forberg.
See Also:
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