Read circuit providing two different reference levels for readin

Details Read circuit providing two different reference levels for readin Read circuit providing two different reference levels for readin

1992-10-23

1994-04-19

Hajec, Donald

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data verification

360 67, G11B 509, G11B 502

Patent

active

053051572

ABSTRACT:
A hard disk drive is disclosed in which the disk has tracks each divided into alternating data sectors and servo sectors, with the control data such as track addresses on the servo sectors being normally recorded more stably than the main data on the data sectors. In order to obtain read pulses representative of the peaks of the output waveform of a transducer, this waveform is directed on one hand into a differentiator circuit and thence into a wave shaping circuit for the provision of data pulses which rise and decay in synchronism with the peaks of the transducer output waveform. On the other hand, the transducer output waveform is sent into a gate pulse circuit, in which the waveform is compared with a reference signal in order to provide gate or window pulses. A logic circuit is provided for ascertaining whether the data pulses rise and decay within the durations of the gate pulses and, if they do, for producing read pulses indicative of the rises and decays of the data pulses. The duration of the gate pulses is made shorter for recovery of the control data than for main data recovery, with a view to more precise detection of the peaks of the transducer output waveform representative of the control data.

REFERENCES:
patent: 4313140 (1982-01-01), Keidl
patent: 4318141 (1982-03-01), Haynes
patent: 4392164 (1983-05-01), Lequien
patent: 4646175 (1987-02-01), Sokolik et al.
patent: 4722010 (1988-01-01), Suzuki et al.
patent: 4724495 (1988-02-01), Hedberg et al.
patent: 4729045 (1988-03-01), Baugh
patent: 4907100 (1990-03-01), Nishiyama et al.
patent: 5079654 (1992-01-01), Uno et al.

Affiliated with

Also associated with

Rating

Read circuit providing two different reference levels for readin does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Read circuit providing two different reference levels for readin, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Read circuit providing two different reference levels for readin will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-24609