Radio receiver comprising a frequency locked loop with audio frequency feedback, and a muting circuit
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United States of America Patent
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Oct 15, 1985
Issued Date -
N/A
app pub date -
Aug 10, 1983
filing date -
Sep 4, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Radio-receiver having a frequency-locked loop which comprises, 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 are 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. A further frequency voltage converter comprising an all-pass frequency-dependent 180.degree. phase shifting network, a phase detector and a limiter detects a tuning error. 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.
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