Constant linear velocity recording servo circuit for write-once

Details Constant linear velocity recording servo circuit for write-once Constant linear velocity recording servo circuit for write-once

1990-04-26

1992-11-10

Chin, Tommy P.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 50, 369 32, 369 4413, G11B 509, G11B 1552, G11B 2010, G11B 2722

Patent

active

051630354

ABSTRACT:
A carrier frequency extracted as a tracking error signal from a disk with an optical pickup by a push-pull method is passed either through a high-pass filter having its cut-off frequency changing proportionally with the disk revolution number or corresponding to the carrier frequency at the disk ordinary revolution, or through a band-pass filter having its center frequency changing proportionally with the disk revolution number or corresponding to the carrier center frequency at the disk ordinary revolution. Therefore, the carrier frequency can be efficiently separated from the EFM signal during recording while allowing to use one beam in reading a tracking error signal and recording an EFM signal, and allowing a compatibility with presently used CD players. Further, the carrier frequency is used for the revolution control of a spindle motor during the revolution start and end, so that even while the tracking servo is not effected the revolution of the spindle motor can be controlled to enter into a fine control capture range.

REFERENCES:
patent: 4353089 (1982-10-01), Winslow et al.
patent: 4603412 (1986-07-01), Yamazaki
patent: 4646280 (1987-02-01), Toyosawa
patent: 4675855 (1987-06-01), Iso et al.
patent: 4855978 (1989-08-01), Kanamaru
patent: 5023856 (1991-06-01), Raaymakers et al.

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