Circuit for reproducing and demodulating modulated digital signa

Details Circuit for reproducing and demodulating modulated digital signa Circuit for reproducing and demodulating modulated digital signa

1981-10-13

1984-09-18

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329106, 329107, 329136, 375 94, 375120, H03K 710

Patent

active

044726864

ABSTRACT:
A circuit for reproducing and demodulating a modulated digital signal which is modulated in a predetermined modulation system such as MFM, EFM and so on. A phase of a clock having a frequency multiplied by an integral number of a bit frequency of the modulated digital signal, is restricted or controlled by a signal showing that a predetermined pattern of the modulated digital signal occurred. The modulated digital signal is demodulated by the thus restricted clock to produce digital informations "0" and "1". A main requirement for detecting the predetermined pattern of the modulated digital signal, is that a reproduced modulated digital signal is reliable. In order to compensate for the drop-out of the modulated digital signal, the demodulation circuit is provided with a modulated digital signal reproducing circuit for complementing a predetermined signal pattern when the drop-out occurred.

REFERENCES:
patent: 4344039 (1982-08-01), Sugiura et al.

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