Asynchronous gain adjustment for PRML disk drive systems

Details Asynchronous gain adjustment for PRML disk drive systems Asynchronous gain adjustment for PRML disk drive systems

1994-05-23

1995-08-01

Epps, Georgia Y.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 32, 341139, G11B 509

Patent

active

054384605

ABSTRACT:
Apparatus and method for asynchronous gain adjustment are provided for data detection in a partial-response maximum-likelihood (PRML) data channel. The PRML data channel includes an analog to digital converter (ADC) having a normal operating range and a filter, gain and timing control coupled to the ADC. A plurality of samples are detected from the ADC. Each of the detected samples are sequentially compared with predetermined threshold values. The predetermined threshold values include a zero value, and a minimum value and a maximum value of the normal operating range of the ADC. An absolute value of each of the detected samples are sequentially compared with a forth predetermined threshold value. A gain adjustment correction value is determined utilizing the sequentially compared values.

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