Digital MRA Compensation for Signal Asymmetry Correction
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Solution Overview
Problem
Magneto-resistive heads introduce non-linear distortion that degrades data detection circuit performance, requiring costly and ineffective compensation methods to correct analog signals.
Innovation Solution
The implementation of data processing systems that include an analog to digital converter circuit and a magneto-resistive adjustment circuit, which reduces signal asymmetry through filtering and digital compensation, using finite impulse response filters and inverse filtering to minimize inter-symbol interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magneto-resistive head compensation is applied to analog signals, then signal distortion is reduced, but circuit complexity and cost increase
Solution Approach 1:
The patent replaces complex analog compensation circuitry with digital signal processing. The analog-to-digital converter converts the magneto-resistive head output to digital samples, which are then processed using digital filters and algorithms to compensate for distortion. This substitution of digital processing for analog circuitry reduces hardware complexity while maintaining or improving compensation effectiveness.
Solution Approach 2:
The patent applies digital filtering operations that modify signal parameters in the digital domain. By using finite impulse response (FIR) filters and other digital processing techniques, the system adjusts signal characteristics to compensate for magneto-resistive distortion without requiring complex analog compensation circuits.
2Measurement precision
If existing compensation methods are used, then some distortion is corrected, but effectiveness is limited
Solution Approach 1:
The patent converts the analog signal to digital samples before processing, allowing preliminary digital filtering and compensation operations to be applied. This preliminary digital processing enables more effective distortion correction by applying sophisticated algorithms that can operate on the full dynamic range of the signal without the limitations of analog circuit bandwidth and noise constraints.
Solution Approach 2:
The patent creates a digital copy of the analog signal through analog-to-digital conversion. This digital replica allows for multiple processing operations to be applied without degrading the original signal, enabling more comprehensive compensation techniques including filtering, equalization, and distortion correction that would be difficult or impossible to implement in the analog domain.
3Object-affected harmful factors
If analog filtering is applied before conversion, then some noise is reduced, but inter-symbol interference increases
Solution Approach 1:
The patent replaces analog filtering operations with digital filtering in the digital domain. By converting the signal to digital samples first, the system can apply digital filters that provide superior noise rejection without introducing the inter-symbol interference problems associated with analog filtering. Digital filters offer precise control over frequency response and can be designed to minimize distortion and interference.
Solution Approach 2:
The patent performs noise reduction through digital filtering after conversion rather than before. This preliminary conversion to digital allows for more effective noise filtering operations that can distinguish between noise and signal components more accurately, reducing noise without causing the signal degradation and inter-symbol interference that plagues analog filtering approaches.
Data Source
AI summary
Various embodiments of the present invention provide systems and methods for data processing. For example, a data processing system is discussed that includes: an analog to digital converter circuit, and a magneto-resistive adjustment circuit. The analog to digital converter circuit is operable to convert an input signal into corresponding digital samples. The magneto-resistive adjustment circuit is operable to reduce signal asymmetry in the digital samples due to sensing by a magneto-resistive head to yield a corrected output.