Dynamic threshold updating circuit for a maximum likelihood dete

Details Dynamic threshold updating circuit for a maximum likelihood dete Dynamic threshold updating circuit for a maximum likelihood dete

1993-12-01

1994-12-13

Shepperd, John

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

375 94, 327 62, 327 74, G11B 509, H03K 5153, H03D 100, H04L 2706

Patent

active

053734009

ABSTRACT:
A maximum likelihood detector for a continuous time disk drive read channel includes a dynamic threshold updating circuit for a maximum likelihood detector using both positive and negative comparators for detecting the positive and negative peaks of an input signal; this includes comparing the input signal with at least one present dynamic threshold to produce positive and negative binary gating signals; a control circuit responsive to the binary gating signals, to the input signal, and to the peak detector circuit which identifies qualified input signal peaks; and a threshold update circuit responsive to the identification of qualified input signal peaks, which adjusts the present dynamic threshold by the difference between the input signal and the present dynamic threshold to obtain the next dynamic threshold.

REFERENCES:
patent: 3593334 (1971-07-01), Bickel
patent: 3921210 (1975-11-01), Halpern
patent: 4346411 (1982-08-01), Buhler et al.
patent: 4504872 (1985-03-01), Petersen
patent: 4634896 (1987-01-01), Shrinkle
patent: 4965811 (1990-10-01), Sparks
patent: 5121263 (1992-06-01), Kerwin et al.

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