Magnetic Stripe Reader Using Timing Detection to Reduce Power
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Solution Overview
Problem
Conventional magnetic card readers face issues with high cost, large hardware footprint, and high power consumption due to the need for multi-bit analog-to-digital converters and large memory, especially in low-power applications.
Innovation Solution
A magnetic stripe reader that uses simple analog and digital signal processing techniques to directly extract binary information from a magnetic stripe, eliminating the need for a multi-bit ADC and large memory, and employing current-mode techniques to reduce power consumption and hardware requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a multi-bit ADC and large memory are used to process the F-2F waveform, then the measurement precision and data storage capacity are improved, but the device complexity, power consumption, and cost increase
Solution Approach 1:
The patent extracts only the essential binary information (zero-crossing events and peak/valley timing) from the F-2F waveform, rather than digitizing the entire waveform with high precision. This selective extraction eliminates the need for multi-bit ADCs and large memory while preserving the critical data needed for magnetic stripe decoding.
Solution Approach 2:
The patent replaces expensive, high-resolution ADCs with simple, low-cost timing detection circuits that only need to identify zero-crossing events and peak/valley occurrences. These simplified components consume less power and occupy less area while sufficient for the application.
2Adaptability or versatility
If high-resolution ADCs are applied to accommodate large amplitude variations, then the adaptability is improved, but the power consumption and hardware area increase
Solution Approach 1:
The patent changes the detection parameter from amplitude measurement (which would require high-resolution ADCs) to timing measurement (zero-crossing and peak/valley timing). This parameter transformation allows the system to accommodate large amplitude variations without using high-resolution converters, thereby reducing power consumption and hardware area.
3Productivity
If additional external components and quiet power supplies are used in analog solutions, then the signal processing capability is improved, but the device complexity and power consumption increase
Solution Approach 1:
The patent merges the signal processing functions into a simplified digital implementation that uses timing detection and counter-based frequency analysis. This integration eliminates the need for multiple external analog components and quiet power supplies, reducing device complexity while maintaining signal processing capability.
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
The solution enables a compact, cost-efficient, and low-power magnetic stripe reader that effectively extracts binary data from magnetic stripes with reduced power consumption and improved cost efficiency.
Implementation Method 1
When the magnetic stripe 102 is swiped through a magnetic reader head (MRH) 104, the MRH 104 detects variation of the magnetic field associated with the magnetic stripe 102.
Data Source
AI summary
The invention relates to a magnetic stripe reader, and more particularly, to systems, devices and methods of directly extracting binary information embedded in a magnetic stripe using simple analog and digital signal processing techniques. Once information stored in the magnetic stripe is extracted as a F-2F waveform by the magnetic stripe reader, peaks, valleys and mid-level transition points between every consecutive peak and valley are detected. A peak-to-peak period and an average time are directly derived to determine whether the corresponding peak-to-peak transition is associated with a binary bit of “1” or “0”. This magnetic stripe reader spares a need for a multi-bit analog-to-digital converter (ADC) and a large memory, and thus, constitutes a simple and self-contained solution that may read out the binary information stored on the magnetic stripe with reduced power consumption and improved cost efficiency.