Automatically compensated squelch circuit

Details Automatically compensated squelch circuit Automatically compensated squelch circuit

1992-06-04

1994-04-12

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Squelch

455220, 375104, H04B 110

Patent

active

053034090

ABSTRACT:
A receiver (100) includes an audio section (200) which provides for compensated squelch settings which are automatically adjustable for changes in operating conditions such as changes in temperature or receiver channel spacing. Temperature circuit (128) provides a temperature signal (134) and controller (122) provides a signal indicating the channel spacing being used by receiver (100). The two signals are combined and formed into an address word which is in turn used to look-up a compensation word from memory location (218). The compensation word is then combined to a default squelch word by adder (216) providing for a compensated squelch word. The compensated squelch word automatically adjusts the squelch circuit's threshold level in order to compensate for changes in operational conditions affecting the squelch circuit.

REFERENCES:
patent: 3851253 (1974-11-01), Eastmond
patent: 4267598 (1981-05-01), Palmer
patent: 4411021 (1983-10-01), Yoakum
patent: 4731873 (1988-03-01), Voyce
patent: 4967165 (1990-10-01), Lee et al.
patent: 5041799 (1991-08-01), Pirez
patent: 5063597 (1991-10-01), Seo et al.

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