Optical memory system for generating a timing control signal for

Details Optical memory system for generating a timing control signal for Optical memory system for generating a timing control signal for

1990-08-09

1992-07-28

Levy, Stuart S.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369121, 369 32, 369 13, G11B 700

Patent

active

051346079

ABSTRACT:
An optical memory device for recording, reproducing, or erasing information applies an optical beam such as a laser beam onto a recording medium. The optical memory device includes a recorded region detecting circuit for detecting information recorded region formed in the recording medium. In the optical memory device, a timing control for recording, reproducing, or erasing is performed with the use of a result obtained through detection of a synchronizing signal, such as a sector mark, indicative of a starting point of an information block and another result obtained through detection in the recorded region detecting circuit. The recorded region detecting circuit includes either at least one peak hold circuit for detecting a peak level of the playback signal or a low pass filter for smoothing the playback signal, and a comparator for comparing an output obtained through the peak hold circuit or through the low pass filter with a reference voltage.

REFERENCES:
patent: 4385328 (1983-05-01), Tanaka
patent: 4418406 (1983-11-01), Ogawa
patent: 4646281 (1987-02-01), Verboom

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