Information recording and reproducing device providing faster ac

Details Information recording and reproducing device providing faster ac Information recording and reproducing device providing faster ac

1993-07-29

1994-05-24

Psitos, Aristotelis

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 4428, 369 4426, 369 47, G11B 700

Patent

active

053155718

ABSTRACT:
An information recording and reproducing device has a first recording clock generation circuit which generates a clock based on pre-recorded information on a magneto-optical disk, a second recording clock generation circuit and a switching circuit The switching circuit selects a first recording clock when recording information is of discrete information and selects a second recording clock when recording information is of successive information. Moreover, in the present device, a first reading clock is used as well as a second clock as a clock for reading out the reproduced data from the magneto-optical disk, which had been once stored in memory. The second reading clock having a reference frequency is generated by a second clock generation circuit and is used for reading out successive information such as music information. The first reading clock in synchronization with the reproduced signal is generated by a first reading clock generation circuit and is used for reading out discrete information such as computer-use data. In addition, in the case of discrete information, it is possible to start recording/reproducing operation immediately after an optical head reaches a desired position, thereby permitting to shorten an access time.

REFERENCES:
patent: 4611319 (1986-09-01), Naito
patent: 4907216 (1990-03-01), Rijnsburger
patent: 4977550 (1990-12-01), Furuya et al.
patent: 5093820 (1992-03-01), Maeda et al.
patent: 5182741 (1993-01-01), Maeda et al.
J. Watkinson, The Art of Digital Audio, Focal Press, pp. 440-487, Jan. 1988.

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