Decimation DC offset control in a sampled amplitude read channel

Details Decimation DC offset control in a sampled amplitude read channel Decimation DC offset control in a sampled amplitude read channel

1994-11-17

1996-12-10

Kim, W. Chris

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 51, 360 65, G11B 509

Patent

active

055837069

ABSTRACT:
In a sampled amplitude read channel for magnetic recording, a nonlinear discrete time decimation filter in a negative feed back loop adjusts a DC offset in an analog read signal from a magnetic read head without distorting the read signal. In sampled amplitude recording, adding the samples of an isolated positive pulse to the samples of an isolated negative pulse generates the DC offset of the discrete time sample values. A decimation filter adds the sample values from a positive pulse to the sample values of a negative pulse in order to detect and pass the DC offset in the read signal. The detected discrete time DC offset from the discrete time decimation filter is converted into an analog DC offset signal and subtracted from the analog read signal in a negative feedback loop. A running average decimation filter removes the DC offset during acquisition, and a decision-directed decimation filter removes the DC offset during tracking.

REFERENCES:
patent: 3819864 (1974-06-01), Carroll et al.
patent: 5331583 (1994-07-01), Hara et al.
patent: 5341249 (1994-08-01), Abbot et al.
patent: 5459679 (1995-10-01), Ziperovich
Schmerback, Richetta, Smith, "A27Mhz Mixed Analog/Digital Magnetic Recording Channel DSP Using Partial Response Signaling with Maximum Likelihood Dectection", IEEE International Solid-State Circuits Conference, pp. 136-137, 1991.
Cideciyan, Dolivo, Hermann, Hirt, Schott, "A PRML System for Digital Magnetic Recording", IEEE Journal on Selected Areas in Communication vol. 10, No. 1, pp. 38-56, Jan. 1992.

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