Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1991-01-28
1993-07-27
Pascal, Robert J.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 51, 360 40, G11B 509
Patent
active
052315444
ABSTRACT:
A signal detection circuit of a magnetic recording and reproducing apparatus generates a clock signal synchronized with peaks of a reproduced signal read from a magnetic recording medium on which data have been recorded by a (d, k) run-length code, and determines "1" or "0" with respect to a discrimination threshold based on an absolute value of a peak of the reproduced waveform at a timing synchronized with the clock signal. The signal detection circuit comprises a quantizer for quantizing the reproduced signal in synchronism with the clock signal to produce a quantized signal, a multi-stage shift register for delaying the clock signal in synchronism with the clock signal, and threshold generation means for comparing the quantized signal supplied from the final stage of the multi-stage shift register and the quantized signal representing the current threshold to dynamically generate a new relevant threshold in accordance with the difference in the comparison.
REFERENCES:
patent: 4571575 (1986-02-01), McCullough
patent: 4667318 (1987-05-01), Sugiyama et al.
patent: 5089821 (1992-02-01), Mori
Hitachi , Ltd.
Neyzari Ali
Pascal Robert J.
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