Copyright © Philip M. Parker, INSEAD. Terms of Use.
| Domain | Definition |
Aerospace | A process by which gain is automatically adjusted as a function of input or other specified parameter.Abbreviation AGC. (references) |
Computing | An electronic or mechanical system in radar and the visual section of television receivers which controls the amplification of forward end tubes. Source: European Union. (references) |
Electrical Engineering | The circuits incorporated in the receiver actuated by the received signal which cause the gain of the receiver to vary substantially, inversely as the magnitude of the radio-frequency input, so as to maintain the output level substantially constant for a given modulation factor. Source: European Union. (references) |
Source: compiled by the editor from various references; see credits. | |
(From Wikipedia, the free Encyclopedia)
A very common and typical example is the AGC used in AM radio. Such a receiver is essentially linear - that is, the output is proportional to the input. This is a necessary requirement because the information content of the signal is carried by the changes of amplitude of the carrier frequency. If the circuit were not linear, the modulation could not be recovered with reasonable fidelity. However, the strength of the signal received will vary widely, depending on the range to the transmitter, signal path attenuation, and so on. Clearly it is undesirable that the output volume of the receiver varies accordingly - a listener would not wish to strain to hear a distant signal or to have damage to their hearing if the transmitter was in the next street. AGC solves this problem by measuring the overall strength of the signal and automatically adjusting the gain of the receiver to maintain a constant level of output. When the signal is strong, the gain is reduced, and when weak, the gain is increased, or allowed to reach its normal maximum.
It is usually advantageous to reduce the gain of the front end of the receiver, which has benefits for both the amount of noise in the signal, and performance in the presence of strong signals, such as blocking rejection.
AGC is also found in many types of tape recorder, including basic cassette decks and VCRs, the object being to record to tape a good quality signal but one that does not saturate the tape and cause distortion and other problems, even if the signal to be recorded varies in level. Video copy control schemes such as Macrovision exploit this, inserting signal spikes which will are ignored by most televisions but cause the deck's AGC to overcorrect and corrupt the recording.
Source: adapted by the editor from Wikipedia, the free encyclopedia under a copyleft GNU Free Documentation License (GFDL) from the article "Automatic gain control."
Crosswords: AUTOMATIC GAIN CONTROL |
| Specialty definitions using "AUTOMATIC GAIN CONTROL": error signal ♦ pilot wave ♦ receiver desensitisation, receiver desensitization. (references) |
Source: compiled by the editor from various references; see credits. |
| The following statistics estimate the number of searches per day across the major English-language search engines as identified by various trade publications. Hyperlinks lead to commercial use of the expression at Amazon.com. |
| Expression | Frequency per Day |
automatic gain control | 12 |
automatic gain control circuit | 2 |
| Source: compiled by the editor from various references; see credits. | |
| Language | Translations for "AUTOMATIC GAIN CONTROL"; alternative meanings/domain in parentheses. | ||||||||||||||||||||||
Danish | genindvindingstid for automatisk niveauregulering (recovery period of an automatic gain control), forstærket automatisk niveauregulering (amplified automatic gain control). (various references) | ||||||||||||||||||||||
Dutch | versterkte automatische versterkingsregeling (amplified automatic gain control), uitgestelde automatische versterkingsregeling (biased automatic gain control, delayed automatic gain control (deprecated)), hersteltijd van een automatische versterkingsregeling (recovery period of an automatic gain control), . vertraagde automatische volumeregeling (biased automatic gain control, delayed automatic gain control (deprecated)). (various references) | ||||||||||||||||||||||
Finnish | automaattisen vahvistuksensäädön elpymisjakso (recovery period of an automatic gain control), vahvistettu automaattinen tasonsäätö (amplified automatic gain control). (various references) | ||||||||||||||||||||||
French | temps de réponse de la commande automatique de gain (recovery period of an automatic gain control), commande automatique de gain amplifiée (amplified automatic gain control), commande automatique de gain seuil (biased automatic gain control, delayed automatic gain control (deprecated)), CAG amplifiée (amplified automatic gain control). (various references) | ||||||||||||||||||||||
German | AVR (amplified automatic gain control), automatische Verstarkungsregelung mit verzogertem Einsatz (biased automatic gain control, delayed automatic gain control (deprecated)), automatische Verstärkungsregelung (amplified automatic gain control), Antwortzeit einer automatischen Gewinnkontrolle (recovery period of an automatic gain control). (various references) | ||||||||||||||||||||||
Greek | χρόνος ανάκτησης αυτόματου ελέγχου απολαβής (recovery period of an automatic gain control), ενισχυμένος αυτόματος έλεγχος απολαβής (amplified automatic gain control). (various references) | ||||||||||||||||||||||
Hungarian | automatikus erõsítésszabályozás (agc). (various references) | ||||||||||||||||||||||
Italian | tempo di risposta del controllo automatico di guadagno (recovery period of an automatic gain control), regolatore automatico dell'amplificazione (amplified automatic gain control), controllo automatico del guadagno amplificato (amplified automatic gain control). (various references) | ||||||||||||||||||||||
Pig Latin | automaticay aingay ontrolcay tempo de recuperação do controlo automático de ganho (recovery period of an automatic gain control). (various references) tiempo de recuperación del control automático de ganancia (recovery period of an automatic gain control), control automático de ganancia amplificada (amplified automatic gain control). (various references) förstärkt AVC (amplified automatic gain control), förstärkt automatisk volymkontroll (amplified automatic gain control). (various references) | ||||||||||||||||||||||
| 1. Synonyms 2. Crosswords 3. Expressions: Internet 4. Translations: Modern | 5. Bibliography |
Copyright © Philip M. Parker, INSEAD. Terms of Use.
