Wobble demodulator and wobble demodulation method

Details Wobble demodulator and wobble demodulation method Wobble demodulator and wobble demodulation method

2006-08-29

2006-08-29

Young, Wayne (Department: 2627)

Dynamic information storage or retrieval

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

Control of information signal processing channel

C369S044130, C369S047220, C369S053340, C369S053220

Reexamination Certificate

active

07099244

ABSTRACT:
A wobble demodulator for reproducing digital information from an optical recording medium in which a track is formed in accordance with a wobble signal that is MSK-modulated so as to contain the digital information by a carrier signal with a predetermined frequency and a sine wave signal with a frequency different from that of the carrier signal, includes: a wobble signal detector for detecting a wobble signal of the track from the optical recording medium; a wobble PLL for detecting the carrier signal based on the wobble signal detected by the wobble signal detector; a multiplier for multiplying the carrier signal detected by the wobble PLL by the wobble signal detected by the wobble signal detector and outputting a multiplied output; a MSK detector for detecting a MSK modulation mark having a phase or a frequency different from that of the carrier signal, based on an integrated value obtained by integrating the multiplied output from the multiplier on a predetermined section basis; and a MSK synchronization detector for detecting a synchronization position with respect to the digital information, based on the MSK modulation mark detected by the MSK detector, wherein the MSK detector compares a continuous predetermined number of the integrated values with a first threshold value for detecting a central portion of the MSK modulation mark, a second threshold value for detecting leading and trailing edges of the MSK modulation mark, and a third threshold value for detecting non-modulated portions before and after the MSK modulation mark, and detects the MSK modulation mark based on a pattern of a comparison result.

REFERENCES:
patent: 5999504 (1999-12-01), Aoki
patent: 6345018 (2002-02-01), Maegawa et al.
patent: 2003/0112725 (2003-06-01), Kobayashi et al.
patent: 2003/0165095 (2003-09-01), Iimura et
patent: 2005/0088885 (2005-04-01), Kobayashi
patent: 10-69646 (1998-03-01), None
patent: 2001-126413 (2001-05-01), None
patent: 2001-143404 (2001-05-01), None
patent: 2002-342941 (2002-11-01), None
patent: 2002-352521 (2002-12-01), None

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