Single PLL demodulation of pre-formatted information...

Details Single PLL demodulation of pre-formatted information... Single PLL demodulation of pre-formatted information...

2004-12-14

2008-07-15

Feild, Joseph (Department: 2627)

Dynamic information storage or retrieval

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

Control of information signal processing channel

C369S059200, C369S044130

Reexamination Certificate

active

07400561

ABSTRACT:
A method and apparatus demodulate pre-formatted information embedded in an optical recording medium. The demodulation includes (a) receiving a wobble signal representing data symbols frequency-modulated on a carrier frequency, (b) generating a phase delta signal representing a phase difference between the wobble signal and a corresponding locked signal having the carrier frequency, (c) first sampling the phase delta signal at a data sampling interval to produce first values, (d) second sampling the phase delta signal at each halfway of the data sampling interval to generate second values, (e) determining, based on a difference between two successive second values, if the first sampling is performed at timing corresponding to an end of each data symbol, and (e) adjusting sampling timing of the first sampling towards the timing corresponding to each end of the data symbols, if the sampling timing does not corresponds to the end of each data symbol.

REFERENCES:
patent: 5506824 (1996-04-01), Fairchild et al.
patent: 7138840 (2006-11-01), Serrano et al.
patent: 2004/0202079 (2004-10-01), Oki

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