Disc-shaped recording medium, disc-state recording medium...

Details Disc-shaped recording medium, disc-state recording medium... Disc-shaped recording medium, disc-state recording medium...

2006-12-19

2006-12-19

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

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

Control of information signal processing channel

C369S047280, C369S275400

Reexamination Certificate

active

07151727

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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