Method and apparatus for dynamically adjusting receiver squelch

Details Method and apparatus for dynamically adjusting receiver squelch Method and apparatus for dynamically adjusting receiver squelch

1994-11-07

1996-10-08

Urban, Edward F.

Telecommunications

Receiver or analog modulated signal frequency converter

Squelch

455222, 375351, H04B 110

Patent

active

055640907

ABSTRACT:
An adaptive digital squelch system, responsive to ambient RF background noise, that automatically adjusts the receiver squelch level during intervals when no valid signal is being received. A valid signal is considered to be a signal that is greater than the receiver squelch level and which contains an audio signal at a specific frequency; otherwise, the signal is considered noise. When the invention detects the absence of a valid signal, the squelch level is periodically calculated by averaging multiple noise signal levels at multiple frequencies.

REFERENCES:
patent: 3851253 (1974-11-01), Eastmond
patent: 4411021 (1983-10-01), Yoakum
patent: 4430742 (1984-02-01), Milleker et al.
patent: 4718115 (1988-01-01), Inoue
patent: 5020141 (1991-05-01), Meszko
patent: 5161185 (1992-11-01), Hochschild

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