Optical read-out audio check disc with semitransparent defects o

Details Optical read-out audio check disc with semitransparent defects o Optical read-out audio check disc with semitransparent defects o

1990-05-23

1993-11-02

Young, W. H.

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

3692753, 430945, 356243, G11B 700

Patent

active

052589749

ABSTRACT:
A check disc on which a single frequency signal is recorded on a check point next to an information signal of each track number and simulated defects such that the reproduction signal obtained by reproducing the disc becomes a defect signal in the case where defects occur on the disc are provided on the check point.

REFERENCES:
Patent Abstracts of Japan, vol. 12, No. 188 (P-711) [3035], Jun. 2, 1988, & JP62-295234.
Patent Abstracts of Japan, vol. 9, No. 177 (P-375) [1900], Jul. 23, 1985 & JP60-50641.
IBM Technical Disclosure Bulletin, vol. 28, No. 4, Sep. 1985.
EBU Review, No. 227, Feb. 1988, pp. 2-6.
Funkschau, vol. 60, No. 23, Nov. 4, 1988, pp. 39-40.

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