Optical memory disc driving apparatus

Details Optical memory disc driving apparatus Optical memory disc driving apparatus

1988-08-26

1991-12-17

Envall, Jr., Roy N.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4429, 369 4436, 369 54, G11B 7085

Patent

active

050738852

ABSTRACT:
An optical disc driving apparatus is provided for the access control system with respect to the optical disc, comprising emphasizing circuits which compensate for a decrease in the frequency response of a reproduced signal from an optical head and further comprising peak detection circuits for detecting envelopes of the output signals. The emphasizing circuits and peak detection circuits are not used for processing of the tracking servo sensor signal, therefore the compensation amount need not be accurately controlled. The characteristic of the reproduced signal of the optical disc is effectively utilized, thereby enabling the compensation amount to be used over a wider range from about a proper value to an excessive value. In addition, being able to use the compensation amount over a wider range results in a reduction in the number of separate stages of compensation.

REFERENCES:
patent: 4563760 (1986-01-01), Maeda et al.
patent: 4701897 (1987-10-01), Nakagawa
patent: 4743774 (1988-05-01), Maeda et al.
patent: 4764860 (1988-08-01), Takao
patent: 4788421 (1988-11-01), Ogawa et al.
patent: 4817069 (1989-03-01), Shigemori
patent: 4853913 (1989-08-01), Maeda
patent: 4866687 (1989-09-01), Kasai et al.

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