Dynamic magnetic information storage or retrieval – General processing of a digital signal – Head amplifier circuit
Patent
1990-06-21
1992-04-21
Canney, Vincent P.
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Head amplifier circuit
360 67, G11B 509, G11B 502
Patent
active
051073790
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 portion of the filtered waveform occurring after T.sub.min. The complimentary waveform is then 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 techniques, the overall bandwidth of the system is conserved resulting in an increased binary signalling capability without substantial intersymbol interference.
REFERENCES:
patent: 4595959 (1986-06-01), Bailey
Canney Vincent P.
Maxtor Corporation
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