Noise suppression circuit

Details Noise suppression circuit Noise suppression circuit

1988-02-09

1991-07-02

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Squelch

455 50, 455 63, 455296, H04B 1500

Patent

active

050292382

ABSTRACT:
To reduce noise-ups, a radio receiver includes a comparator which is electrically connected to a variable potential to set a threshold voltage and connected to the IF circuit of the radio for comparison. The output of the comparator is applied to voltage controlled resistance circuits so that as the strength of the signal drops below the threshold value, the resistances are reduced. These reduced resistances are in shunt with a filter resistor so that as the resistance drops, the frequency response of the filter is lowered. Signals from the IF stage are passed through the filter before being transmitted to the audio stage so that as the signal strength drops below the threshold value but before a complete dropout, the frequency response is lowered.

REFERENCES:
patent: 3911776 (1975-10-01), Beigel
patent: 4035730 (1977-07-01), Clayton
patent: 4085370 (1978-04-01), van der Poel et al.
patent: 4207543 (1980-06-01), Izakson et al.
patent: 4484358 (1984-11-01), Iwahashi
patent: 4731873 (1988-03-01), Voyce

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