US 5,706,267 A · Method and apparatus for retrieving data from a storage device

Abstract

An apparatus and method for retrieving densely stored data from various types of magnetic media. A medium is scanned to provide an input signal. The input signal is conditioned through differentiation, equalization and partial integration. Positive and negative signal peak detectors are connected to the conditioned signal, and a threshold signal is generating corresponding to an average or midpoint of the measured positive and negative signal peaks. An output signal is generated by comparing the conditioned signal and the threshold signal. The DC component of the input signal is accounted for by feeding back the output signal and adjusting the threshold signal based on the duty cycle of the output signal.

Claims12

Dependent claims

An apparatus for retrieving data stored on a medium, said apparatus comprising:

means for reading said stored data and generating a signal corresponding to said stored data;
a differentiation stage for processing said signal prior to partial integration thereof;
a partial integrator for receiving said signal;
a threshold generator connected to said partial integrator;
a data generator connected to said partial integrator and to said threshold generator, said data generator including a comparator;
and
a feedback path from said comparator to said threshold generator.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application

08/482,997Filed 7 Jun 1995 · division

Priority

6 May 1994

Granted

6 Jan 1998

Term ends

Not estimatedThe source records don’t support an estimate.

Classification15 codes

G11B 20/10203
Filtering or equalising, e.g. setting the tap weights of an FIR filter: baseline correction
G11B 7/0037
Recording, reproducing or erasing systems characterised by the shape or form of the carrier: with discs
G11B 7/0045
Recording, reproducing or erasing methods; Read, write or erase circuits therefor: recording
G11B 7/005
Recording, reproducing or erasing methods; Read, write or erase circuits therefor: reproducing

Method and apparatus for retrieving data from a storage device

Life of this patent

Method and apparatus for retrieving data from a storage device

Life of this patent

Abstract

Claims12