Jitter measurement apparatus detecting amplitude of phase errors

Details Jitter measurement apparatus detecting amplitude of phase errors Jitter measurement apparatus detecting amplitude of phase errors

1995-04-27

1997-09-02

Tran, Thang V.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 50, 369 4434, 369 4436, 369 59, G11B 700, G11B 509

Patent

active

056639422

ABSTRACT:
A read-out information signal read out from an optical disk carrier is digitized, thereby detecting an amplitude of an absolute value of a phase error between the read-out information signal and a synchronized clock signal. The synchronized clock signal is obtained by using a phase locked loop constituted by a phase detector having two outputs, that is, a phase lead and a phase lag, and a VCO operating at an average value of a differential signal representing a difference between the two outputs. A phase error amplitude is detected from a sum signal representing a sum of the two outputs of this phase detector. By appropriately displacing a focus actuator in a state where a focus control is performed, an offset compensation amount where the phase error amplitude becomes minimum is obtained.

REFERENCES:
patent: 5065384 (1991-11-01), Yokogawa
patent: 5090003 (1992-02-01), Watanabe et al.
patent: 5111443 (1992-05-01), Yokogawa
patent: 5353271 (1994-10-01), Abe
patent: 5475664 (1995-12-01), Shimizume et al.

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