Automatic Gain Control
automatic electronic regulation by recording devices of video and audio signals at a predetermined level (by electronic control), AGC | ||||
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Automatic gain control Definition from Science & Technology Dictionaries & Glossaries
| Telecommunication Standard Terms |
automatic gain control (AGC)
A process or means by which gain is automatically adjusted in a specified manner as a function of a specified parameter, such as received signal level. (188 )
A process or means by which gain is automatically adjusted in a specified manner as a function of a specified parameter, such as received signal level. (188 )
| Abbreviation Airbus A340 |
AGC
Automatic Gain Control: It reduces automatically the background noise.
Automatic Gain Control: It reduces automatically the background noise.
Automatic gain control Definition from Entertainment & Music Dictionaries & Glossaries
| English to Federation-Standard Golic Vulcan |
Automatic gain control
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Automatic gain control Definition from Computer & Internet Dictionaries & Glossaries
| Video Essentials Glossary of Terms |
AGC (Automatic Gain Control)
Automatic gain can be applied ahead of almost any circuit that requires specific levels to operate. As an example, the color decoder needs to see a particular level of color subcarrier at its input in order to display the correct color at the output. There is a reference burst of color subcarrier at the beginning of each horizontal line of known original amplitude. The AGC circuit looks at the incoming signal level and applies what ever gain correction necessary to make that burst correct in amplitude. In the process of doing that, it also corrects the amplitude of the color information in the active picture area. There are certain limits in the accuracy of this circuit. If the incoming burst amplitude is really low, the AGC circuit might not function at all or amplify the signal more than it should. This is of particular concern when attenuation in the cable delivering the video signal to the set reduces the color information much more than it should. The AGC circuit will actually cause the color to look high, if it has over amplified the weak signal, or the set may only display a black and white picture if it doesn’t amplify the signal at all. Several S-Video cable manufacturers have been know to play this game, claiming their cable delivers richer color quality.
Automatic gain can be applied ahead of almost any circuit that requires specific levels to operate. As an example, the color decoder needs to see a particular level of color subcarrier at its input in order to display the correct color at the output. There is a reference burst of color subcarrier at the beginning of each horizontal line of known original amplitude. The AGC circuit looks at the incoming signal level and applies what ever gain correction necessary to make that burst correct in amplitude. In the process of doing that, it also corrects the amplitude of the color information in the active picture area. There are certain limits in the accuracy of this circuit. If the incoming burst amplitude is really low, the AGC circuit might not function at all or amplify the signal more than it should. This is of particular concern when attenuation in the cable delivering the video signal to the set reduces the color information much more than it should. The AGC circuit will actually cause the color to look high, if it has over amplified the weak signal, or the set may only display a black and white picture if it doesn’t amplify the signal at all. Several S-Video cable manufacturers have been know to play this game, claiming their cable delivers richer color quality.
Automatic gain control Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
Automatic gain control
Automatic gain control (AGC) is an adaptive system found in many electronic devices. The average output signal level is fed back to adjust the gain to an appropriate level for a range of input signal levels. For example, without AGC the sound emitted from an AM radio receiver would vary to an extreme extent from a weak to a strong signal; the AGC effectively reduces the volume if the signal is strong and raises it when it is weaker.
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