Clock detection device of information recording/reproducing appa

Details Clock detection device of information recording/reproducing appa Clock detection device of information recording/reproducing appa

1993-09-13

1996-09-24

Psitos, Aristotelis

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 48, 369 59, 369124, G11B 700

Patent

active

055597750

ABSTRACT:
A clock detection device, for an information recording/reproducing apparatus, which detects whether or not data is present on a recording medium with the edge of a data reproduction clock, which is obtained by reproducing clock information for use in synchronizing with the data recorded on the recording medium to reproduce data on the medium. A plurality of read-clock generating cell groups for generating reading clocks and write-clock generating cell groups for generating writing clocks are disposed in such a manner that the reading clocks and writing clocks have a phase difference of 90 degrees. Among the write-clock generating cell group, reproduction signals having phases which are different from each other by 180 degrees can be obtained from even-numbered cells and odd-numbered cells. By obtaining the sum of the reproduction signals from the odd-numbered cells and that of the reproduction signals from the even-numbered cell, and by subtracting the two sum signals, a writing clock is obtained.

REFERENCES:
patent: 4918415 (1990-04-01), Hashimoto et al.
patent: 4949325 (1990-08-01), Tsuyoshi et al.
patent: 4982110 (1991-01-01), Yokogawa et al.
patent: 5062091 (1991-10-01), Araeda et al.
patent: 5111443 (1992-05-01), Yokogawa et al.
patent: 5172357 (1992-12-01), Taguchi

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