Radio receiver comprising a frequency locked loop with audio fre

Details Radio receiver comprising a frequency locked loop with audio fre Radio receiver comprising a frequency locked loop with audio fre

1983-08-10

1985-04-02

Bookbinder, Marc E.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455212, 455256, 455264, 455265, H04B 110, H04B 126

Patent

active

045092052

ABSTRACT:
Radio-receiver having a frequency-locked loop which comprises, arranged one after the other, a tunable voltage-controlled oscillator, a mixer stage, a filtering element, as well as a frequency-voltage converter which is connected to the tunable voltage-controlled oscillator, several stable tunings being possible for each transmitter. An unambiguous selection is made from these stable tunings of a tuning to a desired station by muting the radio receiver in the other stable tuning frequency ranges. To this end the radio receiver according to the invention comprises a muting circuit as well as a control circuit for the muting circuit in which use is made of a further frequency voltage converter comprising an all-pass frequency-dependent 180.degree. phase shifting network, a phase detector and a limiter. By adjusting the muting circuit of the radio receiver to the quiescent condition only in the desired tuning range and by activating it outside this range, a suppression of interstation noise is obtained at the same time.

REFERENCES:
patent: 2177713 (1939-10-01), Granqvist
patent: 2831106 (1958-04-01), Clark
patent: 3619492 (1971-11-01), Evans
patent: 4087756 (1978-05-01), Rogers, Jr.
patent: 4232393 (1980-11-01), Kumaoka et al.

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