Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the head
Patent
1994-10-07
1997-02-11
Sniezek, Andrew L.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the head
360 7702, G11B 5596
Patent
active
056026927
ABSTRACT:
A servo signal demodulator for a banded data disk drive system includes a single data sampling clock for both the data channel sampling and the servo data sampling. The demodulator includes an analog-to-digital converter that receives a readback signal from a read/write head of the disk drive system and generates samples of the readback signal in accordance with a repeating sampling clock signal whose frequency changes as a function of a data band of the disk drive over which the read/write head is positioned, an adder that sums the readback signal samples from the analog-to-digital converter to thereby produce an integrated readback signal value, and a servo signal decoder circuit that latches the adder sum to a register after the adder has summed a sufficient number of readback signal samples to comprise a servo burst, in accordance with a data channel sampling clock signal, and provides demodulated signal information to a servo controller.
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Freitas David A.
Shih Shih-Ming
International Business Machines - Corporation
Neal Regina Y.
Sniezek Andrew L.
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