FM Receiver equipped with noise pulse supression device

Details FM Receiver equipped with noise pulse supression device FM Receiver equipped with noise pulse supression device

1979-03-15

1981-01-20

Olms, Douglas W.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455223, H04H 500

Patent

active

042464412

ABSTRACT:
An FM receiver including a noise pulse detection circuit which receives an FM detected signal containing a pilot signal and produces a control signal when a noise pulse is detected. A gate is operable to interrupt the transmission of the FM detected signal to the subsequent stage for the duration of the presence of the noise pulse responsive to the control signal and a holding circuit holds the FM detected signal of the level immediately before the interrupting operation of the gate. A multiplex demodulator receives outputs of the gate and the holding circuit for demodulating an applied FM detected signal. A signal generator is provided in the multiplex demodulator for generating a signal whose frequency and phase are same as those of the pilot signal. A superimposing circuit superimposes a signal obtained from the signal generator on the output of the holding circuit for the duration of the presence of the noise pulse.

REFERENCES:
patent: 3739285 (1973-06-01), Hepp
patent: 4066845 (1978-01-01), Kishi
patent: 4195203 (1980-03-01), Sakai et al.

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