FM receiver

Details FM receiver FM receiver

1996-09-17

1998-03-24

Eisenzopf, Reinhard J.

Telecommunications

Receiver or analog modulated signal frequency converter

Frequency or phase modulation

455221, H04B 116

Patent

active

057323402

ABSTRACT:
An FM receiver capable of instantaneous muting while receiving a broadcast includes a switch circuit provided in series in an audio signal line in the front end of a deemphasizing capacitor, a variable impedance element connected to the capacitor in parallel, and a waveform shaping circuit for smoothing the rise and fall of a muting signal, wherein the muting signal is fed to the switch circuit as a control signal to turn the switch circuit off during the muting signal period, and wherein an output signal of the waveform shaping circuit is fed to the variable impedance element to change the impedance of the variable impedance element correspondingly to the level of output signal of the waveform shaping circuit.

REFERENCES:
patent: 4914715 (1990-04-01), Miyata
patent: 5204973 (1993-04-01), Sugayama
patent: 5255319 (1993-10-01), Nakamura

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