Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1989-01-24
1990-08-28
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 65, G11B 509
Patent
active
049530410
ABSTRACT:
A read channel detector circuit for recovery of digital data from a readback waveform produced by a magnetic recording head is disclosed. The detector circuit includes a forward filter for slimming the rising edge and slurring the falling edge of an isolated input magnetic pulse. Quantized feedback techniques are then used to produce a compensating waveform which is substantially complimentary to the slurred falling edge of the isolated magnetic pulse. The complimentary waveform is added to the forward filter output to produce a waveform which is substantially a step function. This step function corresponds to a single digital transition, either positive-going or negative-going in a digital output sequence. The equalized waveform is then limited by a comparator to produce the desired digital output sequence. By slimming only the rising edge of the input magnetic pulse and by using quantized feedback techiques, the overall bandwidth of the system is conserved resulting in an increased binary signalling capability without substantial intersymbol interference.
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Canney Vincent P.
Maxtor Corporation
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