Squelch detector

Telecommunications – Receiver or analog modulated signal frequency converter – Squelch

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Details

455225, 375104, H04B 110

Patent

active

053034082

ABSTRACT:
A communication device (100) having a receiver (106) and an audio output device (116) is provided. The communication device (100) includes a digital signal processor DSP (110) for measuring the level of signal energy in a first segment of the frequency spectrum of the received signal to dynamically establish a squelch threshold. The DSP (110) is also used to measure the level of signal energy in a second segment of the frequency spectrum of the received signal. The communication device (100) also includes audio gates (114). The audio gates (114) provides for the unmuting of the audio output device (116) when the signal energy contained in the second segment of the frequency spectrum of the received signal is below the squelch threshold.

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patent: 5151922 (1992-09-01), Weiss

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