Disk drive servo demodulation system which suppresses noise on t

Details Disk drive servo demodulation system which suppresses noise on t Disk drive servo demodulation system which suppresses noise on t

1996-05-28

1998-09-01

Sniezek, Andrew L.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

369 4426, 360 7704, G11B 5596

Patent

active

058018956

ABSTRACT:
A disk drive servo system which provides a position error signal with an increased signal to noise ratio. Mixing waveforms are generated for mixing with dibit burst signals created when a transducer on a recording head of a disk drive magnetically couples to reference position dibits located on a magnetic surface of the disk drive. The mixing waveforms are formed from a finite integer number of sine waves which are coherent with the dibit burst signals. The mixed dibit burst signal are integrated and summed to create the position error signal. Customizing the mixing waveforms allows the signal to noise ratio of the position error signal to be maximized when a magneto-resistive transducer within the disk drive servo system has one of several non-ideal characteristics.

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Hiroaki Yada and Toru Takeda, "A Coherent Maximum Likeihood Head Position Estimator for Perm Disk Drives", APMRC '95, Nov. 29-Dec. 1, 1995, FB-04-1-FB-04-1.
A. J. Betts, "Null Servo Pattern", IBM Technical Disclosure Bulletin, vol. 18, No. 8, Jan., 1976, pp. 2656-2657.
G. Tyson Tuttle, "A 130 Mb's PRML Read/Write Channel with Digital-Servo Detection", ISSCC '96, Feb. 8, 1996, pp. 48-49/64-65.
J. M. Mendel, Lessons in Digital Estimation Theory:, pp. 89-99, Prentice Hall, 1987.

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