squelch

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squelch

Electronics a circuit that cuts off the audio-frequency amplifier of a radio receiver in the absence of an input signal, in order to suppress background noise
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

squelch

[skwelch]
(electronics)
To automatically quiet a receiver by reducing its gain in response to a specified characteristic of the input.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

squelch

squelchclick for a larger image
A simple squelch circuit.
A circuit in a radio receiver that keeps the volume down when no signal is being received, but the volume builds up as soon as a signal is received. The function of a squelch is to adjust the sensitivity of the receiver by eliminating unwanted weak signals that cause background noise such as static, hash, or hiss. Most squelch controls are automatic, but there are a few manual squelch controls, too. Squelch circuits are used in communications equipment, which have long periods of silence between transmissions.
An Illustrated Dictionary of Aviation Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved
References in periodicals archive ?
Then I felt my foot was damp and squelching and I thought I had stepped into some water.
Squelching recurring rumors that Dayton Hudson would unload its department store division, a company official said that the unit is "definitely not for sale."
"While some may claim victory in squelching dissent, only time will tell as to Log Cabin's fate if some changes are not made soon."
The government set rules that kept monopolists from squelching new competitors.
Or could it be performance and installation art, whose recent proliferation he rather puckishly attributes to the aforementioned squelching of rhetoric in painting?
RELENTLESS rain Brought grief and pain Its deadly sound Heard constantly on saturated, squelching ground.
And security forces engaged in a thorough crackdown after the death of leader Zhao Ziyang, squelching any real discussion of his legacy.
A hormone known to suppress appetite is more abundant in seniors than in young adults and has a greater effect in squelching hunger in elderly people, scientists report.
He had barely finished repeating the oath of office in 1994 when he famously started squelching a panoply of "quality of life" crimes: turnstile jumping, panhandling, street vending, drinking alcohol on the street from open containers, marijuana possession, unlicensed dancing in clubs, and the like.
Advocates hope this will diminish the power of the insurance companies and banks, paper mills and shipbuilding industries that exercise unseemly influence over Maine's legislature, squelching consumer protection efforts and tough environmental laws.
Ironically, the squelching of moderates may turn out to be a loss for the Republican party.