Circuit and method for demodulating a servo position burst

Details Circuit and method for demodulating a servo position burst Circuit and method for demodulating a servo position burst

2008-09-30

2008-09-30

Feild, Joseph (Department: 2627)

Dynamic magnetic information storage or retrieval

Modulating or demodulating

C360S077080

Reexamination Certificate

active

09993986

ABSTRACT:
A new technique for Hard Disk Drive (HDD) servo-burst demodulation is provided. A 4-samples per dibit Discrete Fourier Transform (DFT) amplitude estimation is used to calculate the read-head servo-position error signal. Comparatively, the conventional method of burst demodulation—called burst integration—typically uses more than 8 samples/dibit. Consequently, the new 4-samples/dibit DFT burst-demodulation scheme requires fewer samples per dibit than does burst integration, thus reducing the disk space occupied by the burst data while increasing the performance as compared to burst integration. Furthermore, the DFT scheme does not require the samples to be synchronized to any particular points of the servo burst, and can include an averaging algorithm that further improves performance for a given Signal to Noise Ratio (SNR). Moreover, the same sample-clocking circuit that detects the Gray Code servo information can also implement the DFT burst-demodulation scheme to demodulate the servo burst.

REFERENCES:
patent: 5375145 (1994-12-01), Abbott et al.
patent: 5381359 (1995-01-01), Abbott et al.
patent: 5384671 (1995-01-01), Fisher
patent: 5576904 (1996-11-01), Behrens
patent: 5661760 (1997-08-01), Patapoutian et al.
patent: 5796535 (1998-08-01), Tuttle et al.
patent: 5812336 (1998-09-01), Spurbeck et al.
patent: 5818659 (1998-10-01), Cheung et al.
patent: 5862005 (1999-01-01), Leis et al.
patent: 5909336 (1999-06-01), Schaffner et al.
patent: 6122117 (2000-09-01), Aikawa
patent: 6233715 (2001-05-01), Kuki et al.
patent: 2003/0002189 (2003-01-01), Ozdemir
patent: 2003/0048560 (2003-03-01), Ozdemir
patent: 2003/0048562 (2003-03-01), Heydari et al.
patent: 2003/0053245 (2003-03-01), Ozdemir
patent: 0 341 852 (1989-11-01), None
patent: WO 99/60566 (1999-11-01), None
European Search Report for EP 02 25 3882 dated Aug. 28, 2003.
European Search Report for EP 02 25 3883 dated Aug. 28, 2003.
Partial European Search Report, from European Application No. EP 02 25 3868, dated Apr. 2, 2007.
European Search Report for EP 02 25 3885 mailed Nov. 7, 2006.

Affiliated with

Also associated with

Rating

Circuit and method for demodulating a servo position burst does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Circuit and method for demodulating a servo position burst, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Circuit and method for demodulating a servo position burst will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3906554