ADC Sample Inter-Track Interference Compensation

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Solution Overview

Problem

As data storage density increases, inter-track interference leads to recovery errors, limiting the ability to store more information per unit area effectively in storage systems.

Innovation Solution

The implementation of a data processing system comprising an analog to digital converter circuit, an inter-track interference compensation circuit, and an equalizer circuit to convert analog input data into digital samples, reduce inter-track interference, and equalize the output, respectively, thereby mitigating interference and improving data recovery accuracy.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If data storage density is increased, then more information can be stored per unit area, but inter-track interference increases leading to recovery errors

Engineering Contradiction:

Improveinformation storage densityVSAvoiddata recovery accuracy

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The data processing is segmented into distinct functional stages: analog-to-digital conversion, inter-track interference compensation, and equalization. Each stage handles specific aspects of signal processing independently, allowing targeted mitigation of interference effects while maintaining high storage density capabilities.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Inter-track interference compensation is performed in advance before final data recovery and equalization. By compensating for interference from adjacent tracks early in the processing chain, the system prevents interference errors from propagating through subsequent processing stages, thereby maintaining reliability at high storage densities.

Inventive Principle:

Principle #10Preliminary action

2Quantity of substance

If data storage density is increased, then more information can be stored per unit area, but interference between distinct portions of information increases

Engineering Contradiction:

Improveinformation storage densityVSAvoidinter-track interference

Core Design Contradiction:

Quantity of substanceVSObject-generated harmful factors

Solution Approach 1:

The inter-track interference compensation circuit extracts and removes interference components from the read signal that originate from adjacent tracks. By identifying and subtracting the interference portions corresponding to neighboring track data, the system eliminates harmful interference effects while preserving the desired high-density storage capability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The system converts the harmful inter-track interference into a measurable and compensatable effect. By using known patterns of interference from adjacent tracks and actively subtracting them, the previously harmful interference becomes a controlled parameter that can be corrected, thereby enabling higher storage densities without sacrificing data integrity.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS8848308B2Systems and methods for ADC sample based inter-track interference compensation

Publication Date: 2014.09.30 AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE LTD

AI summary

Various embodiments of the present invention provide systems and methods for mitigating inter-track interference using pre-equalized data samples.