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By adding a simple resistor / capacitor timing circuit to our squelch, we can keep it from opening on short bursts of noise that would be distracting. This still leaves one problem. You can't have the squelch circuit close the audio immediately either.
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www.seits.org/repeater/bilevel.htm
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Squelch is a circuit that acts to suppress the audio (or video) output of a receiver in the absence of a sufficiently strong desired input signal. This squelch ... The exit with empty collector of the squelch circuit can be used for suppress AF signal output of the receiver. The current consumption is ... audio amplifier...
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electroschematics.com/368/squelch-schematic/
electroschematics.com/368/squelch-schematic/
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A squelch circuit (111) that is contained in an communications receiver (100) estimates (403, 405) the energy of an input signal in an audio band and in a first portion of the audio band. ... By determining the energy in the audio band ofthe squelch circuit's input signal in this manner, the present invention...
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www.patentgenius.com/patent/5649321.html
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A squelch circuit for a radio transmitter/receiver includes an amplifier, a digitally-controlled electronic volume control, a volume adjusting variable resistor, and a volume controller. The amplifier amplifies a received audio signal input and provides the received audio signal to a loudspeaker.
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www.patentgenius.com/patent/5355531.html
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Squelch - Wikipedia, the free encyclopedia
In telecommunications, squelch is a circuit function that acts to suppress the audio (or video) output of a receiver in the absence of a sufficiently strong desired input signal. Squelch excludes un...
en.wikipedia.org/wiki/Squelch
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and a squelch circuit (210). As determined by the user, the squelch circuit (210) is either in an enabled or in an disabled mode. In the enabled mode, the amplifier (203) receives the audio signal only in presence of the RF signal.
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www.freepatentsonline.com/EP1139562.html
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The simplest form of squelch circuit monitors the RF input signal to the receiver and mutes the audio output if the signal level drops below that necessary to obtain satisfactory audio.
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www.audio-technica.com/cms/site/557bfecb9ab0cfee/index....
www.audio-technica.com/cms/site/557bfecb9ab0cfee/index.html
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3350650 Noise and audio controlled squelch circuit October 1967 Kemper ... Another object of the invention is to provide a squelch circuit operating from the detected audio signal of a receiver and which has channels responsive to two frequency ranges of the signal, with the responses to the two channels being summed...
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freepatentsonline.com/3873926.html
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The M6709 / M7716 is a complete bi-level or switched hysteresis squelch circuit on a chip. It is found only in the Micor radio on the Audio & Squelch board. The schematic shows the M6709 as a complete squelch circuit.
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www.repeater-builder.com/rbtip/micorsquelch.html
www.repeater-builder.com/rbtip/micorsquelch.html
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