Thermal asperity compensation for PRML data detection

Details Thermal asperity compensation for PRML data detection Thermal asperity compensation for PRML data detection

1991-07-31

1993-08-03

Mis, David

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

360 32, G11B 509

Patent

active

052334821

ABSTRACT:
Apparatus and method of thermal asperity compensation 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. When a thermal asperity is detected, a thermal asperity recovery mode is established responsive to the detected thermal asperity. The gain and timing control are held and the normal operating range of the ADC is adjusted responsive to the thermal asperity recovery mode. Also an AC coupling pole frequency is elevated responsive to the thermal asperity recovery mode.

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