Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Patent
1995-12-19
1999-03-02
Faber, Alan
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
369 59, 360 51, G11B 2010
Patent
active
058780092
ABSTRACT:
The disk drive, which is used for performing at least a reproducing operation for a disk-shaped recording medium having a PEP region where information relating to the at least a reproducing operation is recorded, includes: a rotator for rotating the recording medium; a pickup for reading a signal from the recording medium; processing circuits for thresholding a length of a period in which the level of the signal remains unchanged; a demodulating circuit for receiving the thresholding result and for demodulating the signal to reproduce the information based on the thresholding result; a detector for detecting the rotation speed of the recording medium and for outputting a rotation speed signal indicative of it; correcting circuits for receiving the rotation speed signal, and for supplying a discrimination value in accordance with the rotation speed of the recording medium. The discrimination value is used for thresholding the length of the period. In the disk drive of the present invention, the signals are demodulated based on the thresholding result obtained using the discrimination value, whereby allowing the information to be reproduced correctly while the rotation speed of the recording medium changes.
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English Translation of Abstract of Japanese Patent No. 2-189,771 published Jul. 25, 1990.
Translation of a German Office Action dated Dec. 2, 1996.
Conlin David G.
Daley, Jr. William J.
Faber Alan
Sharp Kabushiki Kaisha
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