Frequency demodulation circuit

Details Frequency demodulation circuit Frequency demodulation circuit

1989-09-18

1990-09-25

Grimm, Siegfried H.

Demodulators

Frequency modulation demodulator

Input signal split into plural signals

329336, 329342, 329343, 360 30, H03D 302

Patent

active

049596209

ABSTRACT:
A frequency demodulation circuit disclosed superposes pulses on an input frequency-modulated (FM) signal at substantially peaks of the FM signal before demodulating the FM signal so that zero cross points of the FM signal can be correctly restored. A peak detection circuit detects peaks of the FM signal or peaks of the fundamental wave of the FM signal, which substantially correspond to the peaks of the FM signal. A pulse generating circuit generates, from the peak detection result, a train of pulses respectively occurring at the same timings as those of the detected peak occurrance timings. The generated train of pulses and the FM signal are respectively fed to differential inputs of a differential input type limiter. An output signal of the limiter is fed to a pulse count circuit to obtain a frequency demodulated signal.

REFERENCES:
patent: 3701030 (1972-10-01), Gocho et al.
patent: 3748586 (1973-07-01), Johnson et al.
patent: 4064361 (1977-12-01), Kustka et al.

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