Apparatus for demodulating digital FM signal in an optical disc

Details Apparatus for demodulating digital FM signal in an optical disc Apparatus for demodulating digital FM signal in an optical disc

1997-10-23

1998-11-17

Neyzari, Ali

Dynamic information storage or retrieval

Signal processing by storage and subsequent retrieval

3692754, H09H 576, G11B 724

Patent

active

058386491

ABSTRACT:
A frequency modulated signal, which is expected to have level inversions at data bit boundaries, and which is produced by the reflection of a laser beam from a wobbled spiral groove on a disk-shaped recording medium is detected. The frequency modulated signal is demodulated and its signal level at the location just after the absence of a level inversion is corrected. The position of a movable recording/reproducing head is determined in response to the demodulated FM signal; and data is recorded on or reproduced from the recording medium at the determined position.

REFERENCES:
patent: 4540947 (1985-09-01), Fujimoto
patent: 4942565 (1990-07-01), Lagadec
patent: 5210738 (1993-05-01), Iwata et al.
patent: 5537373 (1996-07-01), Horikiri

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