Inversion phenomenon preventing circuit

Details Inversion phenomenon preventing circuit Inversion phenomenon preventing circuit

1989-05-11

1993-02-09

Wolfe, John H.

Dynamic magnetic information storage or retrieval

Modulating or demodulating

Frequency

360 331, G11B 2006, H04N 5178

Patent

active

051856794

ABSTRACT:
An FM signal which is partly missing zero crossing points is supplied to an input terminal, to which a second polarity discriminating circuit and a lower side band suppressing circuit followed by a first polarity discriminating circuit are coupled together. A pulse extracting circuit receives the outputs of the first polarity discriminating circuit and a second polarity discriminating circuit to produce pulses corresponding only to portions of the FM signal at which the zero crossing points are absent. The pulses thus obtained are subsequently combined in a waveform reforming circuits with the FM signal from the input terminal, thereby permitting the FM signal to regain the zero crossing points.

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patent: 4597021 (1986-06-01), Yamamitsu et al.
patent: 4737862 (1988-04-01), Koga
patent: 4994928 (1991-02-01), Honjo et al.

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