Information recording and read device, information recording dev

Details Information recording and read device, information recording dev Information recording and read device, information recording dev

1990-05-08

1991-11-12

Canney, Vincent P.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 59, G11B 509, G11B 13/04

Patent

active

050653890

ABSTRACT:
The present Patent Application relates to an information recording and read device for recording and reading information on/from an inscribable record carrier, (4; 11) of a write-once type, in which the recorded information includes redundancy for the purpose of error correction. The device comprises recording means (1, 2, 3; 12,15,16) for recording an information pattern which is representative of the information to be recorded in a track on the record carrier (11), read means (5, 6, 7; 12,14, 16) for converting the information pattern into an information signal (Vi), and control means for controlling the recording and/or read process on the basis of the control information in the track. The read means comprises a correction circuit (7; 17) for correcting errors in the information signal on the basis of the redundancy in the information and for suppressing the information signal if the correction circuit is not capable of correcting the errors. The device further comprises means (8; 24, 25) for partly mutilating the recorded information pattern in a selected part of the track in such a manner that in the selected part of the track portions with a mutilated information pattern and portions with an undamaged information pattern alternate with each other in a manner such that control on the basis of the control information in the track remains possible but the error correction circuit (7; 17) is no longer capable of correcting the errors.

REFERENCES:
patent: 4817077 (1989-03-01), Ono
patent: 4916680 (1990-04-01), Oldham

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