FM-Receiver having multipath reception detector and noise pulse

Details FM-Receiver having multipath reception detector and noise pulse FM-Receiver having multipath reception detector and noise pulse

1982-11-10

1985-01-01

Hickey, R. J.

Electrical audio signal processing systems and devices

Binaural and stereophonic

Broadcast or multiplex stereo

455334, H04B 110, H04H 500

Patent

active

044919573

ABSTRACT:
FM-receiver comprising an aerial input having connected thereto, in succession, an RF input stage, an IF portion, an FM-detector and a stereo decoder having a mono-stereo control circuit therein, also a control signal generating circuit being connected thereto, the control signal generating circuit comprising a multipath reception detector and being connected to the IF portion via a level detector, the multipath reception detector comprising an amplitude detector connected to the level detector via a bandpass filter. The FM-receiver also comprises a noise pulse suppression circuit arranged between the FM-detector and the stereo decoder for keeping the amplitude of the stereo multiplex signal constant during the occurrence of noise pulses. In order to eliminate the disturbing effect of such noise pulses on the mono-stereo control circuit the bandpass filter has a lower 3 dB cut-off frequency of the order of magnitude of 1 KHz and an upper 3 dB cut-off frequency of not more than of the order of magnitude of 10 KHz.

REFERENCES:
patent: 3921077 (1975-11-01), Suzuki
patent: 3999132 (1976-12-01), Smith
patent: 4191850 (1980-03-01), Tanada
patent: 4408098 (1983-10-01), Kamalski
patent: 4419541 (1983-12-01), Kishi et al.

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