Method and apparatus for reading and writing information on a re

Details Method and apparatus for reading and writing information on a re Method and apparatus for reading and writing information on a re

1988-05-05

1990-06-05

Richardson, Robert L.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

G11B 700

Patent

active

049320173

ABSTRACT:
A method and device are disclosed for recording information represented by a code signal Vd on an optically readable record carrier (1) by means of optically detectable recording marks (8). Outside the areas (30) of the record carrier (1) which are used for recording the information signal reference marks (33) are formed. When the record carrier is read a detection signal Vd is generated, from which the code signal is derived by comparison of the detection signal Vd with a decision level Vref. The decision level Vref is derived from those portions (34) of the detection signal Vd which are representative of the reference marks (33).

REFERENCES:
patent: 4569038 (1986-02-01), Nagashima et al.

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