Elimination of inter symbol interference-induced timing phase st

Details Elimination of inter symbol interference-induced timing phase st Elimination of inter symbol interference-induced timing phase st

1995-09-15

1997-02-04

Kim, W. C.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 45, G11B 509

Patent

active

056005024

ABSTRACT:
A method is provided for elimination of periodic inter symbol interference (ISI) resulting in timing phase steps and channel amplitude control steps occurring following a periodic preamble pattern, such as a 1/4 T sine wave pattern and at the beginning of a random pattern user data field in a partial response, maximum likelihood digital magnetic data storage channel. The method comprises the steps of: determining a periodicity of periodic ISI events in relation to main magnetic flux transitions during playback of a periodic signal waveform thereof, writing a new preamble field to the magnetic data storage channel of a periodic signal waveform preceding the user data field in which the phase of the periodic signal waveform is shifted, e.g. 180 degrees, at the determined periodicity of undershoot events, and locking a digital data sampling timing loop and a digital channel gain control circuit to the new preamble field, whereby undershoot-induced ISI timing phase steps and amplitude control steps at the preamble-to-user data field transition region are eliminated.

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