Signal recording layer recognition method in digital disk and ap

Details Signal recording layer recognition method in digital disk and ap Signal recording layer recognition method in digital disk and ap

1996-04-10

1997-09-23

Hindi, Nabil

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369112, 369 4427, G11B 700

Patent

active

056712030

ABSTRACT:
A digital disk player recognizes a signal recording layer in a loaded disk, which includes a pickup for converting an optical signal read from the loaded digital disk into an electrical signal, a converter for converting the electrical signal output from the pickup into an electrical pulse signal of which the number of pulses varies according to the number of the signal recording layers in the loaded disk, and a controller for controlling an initial focusing operation of the pickup based on a position corresponding to focus position and determining whether the signal recording layer of the loaded disk is a multilayer or a single layer recording layer based on the number of the pulses contained in the electrical pulse signal input to the converter. The controller controls a display such as a digitron to display the number of the layers which corresponds to the number of the pulses.

REFERENCES:
patent: 5263011 (1993-11-01), Maeda et al.
patent: 5408453 (1995-04-01), Holtslag et al.

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