Disc-shaped recording medium, cutting apparatus for same,...

Details Disc-shaped recording medium, cutting apparatus for same,... Disc-shaped recording medium, cutting apparatus for same,...

2006-11-13

2009-02-03

Dinh, Tan X (Department: 2627)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S047220

Reexamination Certificate

active

07486607

ABSTRACT:
There is provided an optical disc having preformed thereon a spiral wobbled track as a grove and/or land along with data is to be recorded. The track is wobbled for a series of predetermined signal units each composed of an FSK information bit part based on a waveform resulted from FSK modulation of information bit and a singe-frequency part based on a waveform of a single frequency. The FSK modulation uses two different frequencies of which the one is the same as the single frequency and the other is different from the single frequency. These different frequencies are in such a relation that each of them has an even number of wobbles and an odd number of wobbles alternately in a predetermined cycle.

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