Recording state detection system for use in a disk drive

Details Recording state detection system for use in a disk drive Recording state detection system for use in a disk drive

2005-08-09

2005-08-09

Bayard, Emmanuel (Department: 2631)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

Reexamination Certificate

active

06928125

ABSTRACT:
A recording state detection system includes a Viterbi detection unit, an error calculation unit for calculating error data series representing a difference between each sample data of the reproduced data series and a corresponding data of the data series output from the Viterbi detection unit, a normal level judgement unit for judging the normal level of each sample data, and a state calculation unit for calculating the amplitude data and the asymmetry of the sample data series based on the error data series and the normal level. The disk drive unit corrects a recording optical power based on the calculated amplitude and the asymmetry.

REFERENCES:
patent: 5530708 (1996-06-01), Miya
patent: 5838697 (1998-11-01), Abe
patent: 5938790 (1999-08-01), Marrow
patent: 6029268 (2000-02-01), Kong et al.
patent: 6108384 (2000-08-01), Okumura et al.
patent: 6118826 (2000-09-01), Zehavi et al.
patent: 6459669 (2002-10-01), Fujita et al.
patent: 6704154 (2004-03-01), Hirano et al.
patent: 06195713 (1994-07-01), None
patent: 07141659 (1995-06-01), None
patent: 07153078 (1995-06-01), None
patent: 09204665 (1997-08-01), None
patent: 10055540 (1998-02-01), None
Viterbi, Andrew J., “Convolutional Codes and Their Performance in Communication Systems”,IEEE Transactions On Communications Technology, vol. COM-19, No. 5, pp 751-772, Oct. 1971.
Itoi S. et al., “A PRML System on the Optical Video Disk Recorder”, 1994 ITEE Annual Convention, pp 287-288.

Affiliated with

Also associated with

Rating

Recording state detection system for use in a disk drive does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Recording state detection system for use in a disk drive, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Recording state detection system for use in a disk drive will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3465567