Magnetic Head Device Real-Time Gain Control for Output Fluctuation
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Solution Overview
Problem
Existing magnetic head devices require repeated card insertion to set gain, are unable to handle output variations, and are prone to reading errors due to magnetic head wear and changing card transfer speeds.
Innovation Solution
A magnetic head device with an amplifier section, A/D converter section, signal comparator section, and gain control section that adjusts gain in real-time to match a predetermined criterion value, allowing for one-time gain setting and stable output waveform maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If repeated card insertion is used to set gain, then gain setting accuracy is improved, but operation complexity and time consumption increase
Solution Approach 1:
The system performs preliminary detection of the magnetic card during the initial card insertion, measuring the output waveform characteristics before actual data reading. This preliminary action captures the gain setting information in the first card insertion, eliminating the need for repeated insertions while maintaining accurate gain calibration based on the detected output characteristics.
2Ease of operation
If standard card is used for gain setting, then gain setting process is simplified, but adaptability to different magnetic cards decreases
Solution Approach 1:
The system measures the actual output waveform from each magnetic card during initial insertion and uses this feedback information to dynamically adjust the gain setting. By comparing the measured output characteristics with expected values, the system automatically calibrates the gain for each specific card, adapting to variations in magnetic properties, wear conditions, and card characteristics without requiring repeated manual adjustments.
3Device complexity
If gain is not adjusted for magnetic head wear, then device complexity is reduced, but reading reliability decreases
Solution Approach 1:
The magnetic head device performs self-diagnosis and self-adjustment by detecting its own output waveform characteristics during normal card insertion. The system automatically measures the output level, compares it with reference values, and adjusts the gain setting to compensate for magnetic head wear without requiring external calibration equipment or complex manual intervention, thereby maintaining reading reliability while keeping the device structure relatively simple.
4Stability of the object's composition
If gain adjustment is made for changing card transfer speed, then output stability is improved, but control complexity increases
Solution Approach 1:
The system performs preliminary measurement of the output waveform characteristics during the initial card insertion before actual data reading occurs. By detecting the output level and characteristics in advance, the system pre-adjusts the gain setting to account for variations in card transfer speed, ensuring output stability during the critical data reading phase without requiring continuous real-time control adjustments.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables simple and effective gain setting, suppresses output fluctuations, and improves reading performance by adjusting gain proportionally with output differences, reducing the likelihood of reading errors.
Implementation Method 1
a magnetic head for reproducing information recorded in a magnetic information recording medium
Data Source
AI summary
A magnetic head device which suppresses output fluctuation even though the output changes in part of an output waveform from the magnetic head. The magnetic head device includes a magnetic head for reproducing information recorded in a magnetic information recording medium; an amplifier section for amplifying a reproduced signal that the magnetic head has reproduced, by using a gain; an A/D converter section for converting the reproduced signal that has been amplified, to a digital signal, by sampling the signal at predetermined intervals, in order to output the converted digital signal; a signal comparator section for comparing a digital signal output value with a predetermined output criterion value; and a gain control section for adjusting the gain in such a way as to make the output value closer to the output criterion value, in the case where the output value is either greater or smaller than the output criterion value.