Programmable digital centerline tracking threshold apparatus and

Details Programmable digital centerline tracking threshold apparatus and Programmable digital centerline tracking threshold apparatus and

1998-07-15

1999-07-06

Tran, Thang V.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

369 59, 369124, 369 4435, G11B 509

Patent

active

059204389

ABSTRACT:
Disclosed are a programmable digital device and method for generating tracking threshold signals for qualification of input peak signals in response to programmed digital gain signals which control the rate at which the envelope of the qualified input peak signals is followed, and in response to a programmed digital attenuation signal which determines the proportion of the peak envelope at which to generate new tracking threshold signals. The programmable digital device and method also provide a programmed clamp signal to clamp the positive and negative threshold signals to not fall below the programmed values. An anti-hang capability is provided to allow the thresholds to drop after a programmed time period during which no signal is detected. In an alternative arrangement, the centerline of the envelope is followed and used as the threshold.

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