Telecommunications – Receiver or analog modulated signal frequency converter – Squelch
Patent
1980-09-02
1984-01-17
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Squelch
455208, 455213, 455263, H04B 110, H04B 126
Patent
active
044267355
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: 4117410 (1978-09-01), Bender
patent: 4283792 (1981-08-01), Hongu
Bookbinder Marc E.
Briody Thomas A.
Goodman Edward W.
Streeter William J.
U.S. Philips Corporation
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