Card Processing Apparatus Noise Filtering via Pattern Matching
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Solution Overview
Problem
Card processing apparatuses in ATMs struggle to read magnetic information transmitted via radio waves due to interference with noise signals, as the card insertion detection sensor treats these signals as invalid data, failing to differentiate between actual magnetic card and radio wave signals.
Innovation Solution
A card processing apparatus equipped with a card insertion opening, a detection sensor, a magnetic head, and a control unit that detects and filters magnetic signals based on predetermined patterns, allowing it to distinguish between magnetic card and radio wave signals, thereby processing both types of information without additional configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the card insertion detection sensor is used to detect magnetic cards, then magnetic card insertion can be detected, but radio wave transmitted magnetic information is misidentified as noise and cannot be read
Solution Approach 1:
The control unit changes the detection parameters by looking for specific predetermined patterns in the magnetic signals. When a signal matches the predetermined pattern, it is identified as valid magnetic information regardless of whether a physical card is detected. This allows the system to accept both contactless radio wave transmissions and traditional magnetic card insertions using the same detection sensor.
2Adaptability or versatility
If the magnetic head continuously reads magnetic signals, then both magnetic cards and radio wave signals can be detected, but noise signals cannot be distinguished from valid signals
Solution Approach 1:
The system performs preliminary action by establishing predetermined patterns before actual signal detection. These patterns serve as validation criteria that must be matched before accepting any magnetic signal as valid. This preliminary setup enables the magnetic head to continuously read signals while the control unit can reliably distinguish between noise and valid magnetic information from either magnetic cards or radio wave transmissions.
3Reliability
If the card processing apparatus processes only inserted magnetic cards, then reliable card reading is achieved, but contactless payment functionality is lost
Solution Approach 1:
The card processing apparatus is designed with universal functionality to handle both traditional magnetic card insertions and contactless radio wave transmissions. The control unit universally applies the predetermined pattern matching approach to validate signals from either source, making the same detection sensor and magnetic head serve multiple functions. This multi-functionality maintains reliability through pattern validation while enabling convenient contactless operation.
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 accurate reading and processing of magnetic information from both inserted magnetic cards and radio wave transmissions, reducing malfunctions and enhancing user convenience by suppressing noise interference and maintaining sensor functionality.
Implementation Method 1
a magnetic head configured to detect a change in an electromagnetic field and output a magnetic signal
Data Source
AI summary
A card processing apparatus includes a card insertion opening, and a card insertion detection sensor. A magnetic card is to be inserted in the card insertion opening. The card insertion detection sensor is configured to detect the magnetic card inserted in the card insertion opening. A magnetic head is provided near the card insertion opening and is configured to detect a change in an electromagnetic field and output a magnetic signal. A control unit is configured to: receive the magnetic signal from the magnetic head when the card insertion detection sensor detects the magnetic card; receive magnetic signal from the magnetic head when the card insertion detection sensor does not detect the magnetic card; acquire the magnetic signal when the magnetic signal includes a predetermined pattern; and discard the magnetic signal when the magnetic signal does not include the predetermined pattern.