Digital FM demodulating apparatus

Details Digital FM demodulating apparatus Digital FM demodulating apparatus

1989-05-23

1991-02-19

Pascal, Robert J.

Demodulators

Frequency modulation demodulator

Having specific distortion, noise or other interference...

329320, 329336, H03D 300

Patent

active

049947540

ABSTRACT:
A digital FM demodulating apparatus includes a phase detector for detecting the phase of an input digital FM signal; a differentiator for time differentiating the signal from the phase detector to get an instantaneous frequency of the input FM signal; an over-modulation detector for detecting an over-modulation occurence of the input FM signal according to the instantaneous frequency to generate a detection signal, and an over-modulation corrector for obtaining a demodulated output signal which is corrected so as to have no deterioration due to the over-modulation occurrence according to the detection signal from the over-modulation detector.

REFERENCES:
patent: 4090145 (1978-05-01), Webb
patent: 4096360 (1978-06-01), Takahashi et al.
patent: 4203134 (1980-05-01), Christopher et al.
patent: 4629994 (1986-12-01), Shimotashiro et al.
patent: 4757390 (1988-07-01), Mehrgardt et al.
patent: 4851785 (1989-07-01), Gehrt et al.

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