Amplitude sensor with adaptive threshold generation

Details Amplitude sensor with adaptive threshold generation Amplitude sensor with adaptive threshold generation

1983-11-22

1987-01-06

Eisenzopf, Reinhard J.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Head amplifier circuit

307358, 324103P, 360 66, 360 67, G11B 502, G11B 503

Patent

active

046351426

ABSTRACT:
An improved amplitude sensing system for detecting the signal amplitude from the read head in a magnetic storage device wherein the signal amplitude is compared to a threshold voltage. When the signal amplitude is greater than the threshold voltage, the amplitude sensor output is high, indicating sufficient amplitude, and when the signal amplitude is less than the threshold voltage, the amplitude sensor output is low, indicating insufficient amplitude. The threshold voltage is selected to be the higher of a fixed minimum voltage, the minimum long term acceptable read head signal level, or an adaptive voltage derived from the peak voltages of the read head signal amplitude, which is a fixed percentage of the long term read head signal level. When the read head signal is not present for a long time, or while tape motion is starting, the fixed minimum voltage prevents invalid amplitude sensor output. When the read head signal is present, the adaptive voltage allows the threshold to vary with the characteristic signal output of the read head signal and the signal amplitude produced by different magnetic media.

REFERENCES:
patent: 3225213 (1965-12-01), Hinrichs et al.
patent: 3502993 (1970-03-01), Schurzinger et al.
patent: 3638183 (1972-01-01), Progler et al.
patent: 4132977 (1979-01-01), Nagano
patent: 4375037 (1983-02-01), Ikushima
patent: 4385328 (1983-05-01), Tanaka

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