Circuit for detecting noise and producing a squelch signal

Details Circuit for detecting noise and producing a squelch signal Circuit for detecting noise and producing a squelch signal

1993-08-09

1995-08-29

Urban, Edward F.

Telecommunications

Receiver or analog modulated signal frequency converter

Squelch

455222, 455312, 375351, H04B 110

Patent

active

054469210

ABSTRACT:
An apparatus for detecting noise in communications channels in electrical power transmission systems and generating squelch signals, for transfer-trip receivers for performing protection and control functions, detects changes in a period of an analog signal and generates a signal in response to such changes. The apparatus receives an analog signal, generates zero-pulses corresponding to zero-transitions of the analog signal, generates an error pulse when an interval between successive ones of the zero-pulses either exceeds a preselected long window interval or is less than a preselected short window interval, and generates, in response to the error pulse, a squelch signal.

REFERENCES:
patent: 3546607 (1970-12-01), Dixon
patent: 3633112 (1972-01-01), Anderson
patent: 3824470 (1974-07-01), Eastmond
patent: 3904969 (1975-09-01), Eastmond
patent: 4232387 (1980-11-01), Cottatellucci
patent: 4806853 (1989-02-01), Fleischer et al.

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