Signal to noise ratio of a multiple layer optical disk with modu

Details Signal to noise ratio of a multiple layer optical disk with modu Signal to noise ratio of a multiple layer optical disk with modu

1992-04-28

1993-11-02

Dzierzynski, Paul M.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 94, 369107, 369284, G11B 700

Patent

active

052589692

ABSTRACT:
The invention relates to the reading of optical disks in which the recording is performed in volume in separate layers. Reading a bit recorded within the layers gives a signal with a background noise from all the adjacent bits illuminated by the read beam. In order to eliminate this background noise, the read beam is modulated in position about the bit to be read, either horizontally or vertically with respect to a recording level. The background noise remains unchanged but the signal from the bit being read becomes a periodic signal.

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