Frequency demodulation circuit

Details Frequency demodulation circuit Frequency demodulation circuit

1988-05-02

1991-02-19

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

Modulating or demodulating

Frequency

360 331, G11B 2006

Patent

active

049949284

ABSTRACT:
A frequency demodulation circuit superposes pulses on an input frequency-modulated (FM) signal at substantially the 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, pulses respectively occurring at the same timings as those of the detected peak occurrance timings. The generated pulses are added to the FM signal to obtain the pulse-superposed FM signal.

REFERENCES:
patent: 4470080 (1984-09-01), Kimura

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