US 6,307,900 B1 · Method and apparatus for recovering digital data by employing asynchronous data sampling techniques

Abstract

A digital data detection system, equipped with an interpolation apparatus, for generating decoded data by detecting information stored on a magnetic storage medium by interpolating sampled data using a phase difference signal and an interpolation coefficient is provided. The digital data detection system includes a magnetic storage medium, an analog signal acquisition circuit, a pre-amplifier, an A/D converter, an interpolation circuit, an equalizer filter, a data decoder, and a phase error detector. The interpolation circuitry includes an accumulation block, a filter coefficient generation block, a HOLD signal generation block, and an interpolator. The interpolation circuitry generates interpolated data using a phase error signal and an interpolation coefficient provided from a MCU (Main Control Unit).

Claims11

Dependent claims

A digital data detection system, including a simplified gate structural interpolation apparatus, for generating decoded data by detecting data stored on a magnetic storage medium by interpolating sampled data using a phase error signal and an interpolation coefficient, wherein the sampled data is sampled based on a sampling clock, comprising:

means of a magnetic medium, for storing the data;
means for detecting the stored data in the form of analog signals from the storing means;
means for amplifying the detected analog signals;
means for sampling the amplified analog signals in accordance with the sampling clock fed thereto from a MCU (main control unit) and generating sampled digital data;
means for interpolating the sampled digital data, in order to generate interpolated data, using the phase error signal and the interpolation coefficient;
means for equalizing the interpolated data;
means for generating decoded data by using a Viterbi algorithm employing maximum likelihood sequence detection;
and
means for detecting the phase error signal and transmitting the detected phase error signal to the interpolating means.

6 more elements

A simplified gate structural interpolation apparatus for generating interpolated data by detecting data stored on a magnetic storage medium by sampling the data using a phase error signal and an interpolation coefficient, wherein the sampled data is sampled based on a sampling clock fed from a MCU (Main Control Unit), comprising:

means for adding the phase error signal to the interpolation coefficient;
means for accumulating an output signal of the adding means;
means for generating a filter coefficient corresponding to the accumulated signal;
means for interpreting the accumulated signal to thereby generate a HOLD signal;
and
a filter means for generating interpolated data by processing the sampled data together with the corresponding filter coefficient.

3 more elements

Dependencies are inferred from the claim text.

Method and apparatus for recovering digital data by employing asynchronous data sampling techniques

Life of this patent

Method and apparatus for recovering digital data by employing asynchronous data sampling techniques

Life of this patent

Abstract

Claims11