Disc recording and/or reproducing apparatus having an enlarged l

Details Disc recording and/or reproducing apparatus having an enlarged l Disc recording and/or reproducing apparatus having an enlarged l

1994-02-10

1995-07-25

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 59, 369 59, G11B 2710, G11B 502, H04N 576

Patent

active

054367700

ABSTRACT:
A recording and/or reproducing device for detecting the servo pattern pre-recorded at a pre-set, interval on a disc-shaped recording medium, and for generating channel clocks, that is, clock signals for sampling data used during recording or reproduction on the basis of the detected information on the servo pattern, is disclosed. For providing the correctly phased channel clocks, a voltage controlled oscillator employed in the phase-locked loop of a channel clock forming unit, of the recording and/or reproducing device for generating the channel clocks is controlled not only by phase error data but also by positive phase error data and negative phase error data for enlarging the locking range for enabling correct phase locking. Besides, for providing correctly phased channel clocks for the disc-shaped recording medium of the constant angular velocity (CAV) system, the pickup position on the recording medium is detected so that the phase error detection data is corrected on the basis of the detected pickup position for providing the channel clocks phased in correspondence with the recording/replay position on the recording medium.

REFERENCES:
patent: 4688205 (1987-08-01), Abiko
patent: 5170383 (1992-12-01), Yonezawa et al.

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