Data recording and/or reproducing method and apparatus

Details Data recording and/or reproducing method and apparatus Data recording and/or reproducing method and apparatus

1993-06-29

1995-03-21

Epps, Georgia Y.

Dynamic information storage or retrieval

Information location or remote operator actuated control

Selective addressing of storage medium

369 47, 369 48, G11B 7085

Patent

active

054003091

ABSTRACT:
A method and apparatus is provided for reproducing data using a disc-like recording medium having a plurality of zones divided radially thereof. Different frequencies are set for the zones each of which includes a plurality of data blocks disposed in a predetermined order. A signal with the set frequency is recorded on the data blocks in the respective zone. The data blocks are scanned by a head to read out the recorded signal while moving the head radially over the recording medium. A clock generating circuit generates a clock signal with a frequency set for the zone to which the data block being scanned by the head belongs. The data is reproduced from the signal read out by the head using a reproduction circuit, on the basis of the clock signal. When the head reads out the signals over two continuous zones, the head position of the last data block of the zone from which the signals are read out earlier is detected and a detection signal is outputted. In response to the detection signal, a control circuit instructs the clock generating circuit to change the frequency of the clock signal.

REFERENCES:
patent: 5138599 (1992-08-01), Fukushima et al.
patent: 5175654 (1992-12-01), Saito et al.
patent: 5182740 (1993-01-01), Mizokami et al.
patent: 5210733 (1993-05-01), Yamaguchi et al.
patent: 5278703 (1994-01-01), Rub et al.
Patent Abstracts of Japan, Abstract of Japanese Patent No. JP-A-2,023,552, vol. 14, No. 167, (p. 1031) Publication Date: Mar. 30, 1990.

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