Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1995-07-28
1999-02-16
Psitos, Aristotelis M.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
G11B 509
Patent
active
058726659
ABSTRACT:
A circuit and method for generating write compensated write data signals in magnetic data recording. The circuitry is programmable to enable generation of write compensation meeting a variety of write compensation specifications. In particular, the circuitry can be programmed to generate extra write pulses, to adjust the pulse width and to adjust the pulse spacing within data cells. In an example embodiment, an input waveform drives a reset input on a state machine. An output waveform shape is stored as a pattern of bits in a register. The state of the state machine determines which register bits are selected by a multiplexer for output as a new write compensated write data signal.
REFERENCES:
patent: 3855616 (1974-12-01), Schneider
patent: 5060089 (1991-10-01), Cleveland
patent: 5184256 (1993-02-01), Chikusa
patent: 5187614 (1993-02-01), Hashimoto et al.
patent: 5241429 (1993-08-01), Holsinger
patent: 5255130 (1993-10-01), Buchan et al.
"Write equalization in high-linear-density magnetic recording", Richard C. Schneider; IBM J. Res. Develop, vol.29, No. 6, Nov. 1985, pp. 563-568.
Earhart Tod
Habbinga Erik
Millican Mark
Hewlett--Packard Company
Neal Regina Y.
Psitos Aristotelis M.
Winfield Augustus W.
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