Touch Terminal Scan Frequency Noise Reduction
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Solution Overview
Problem
Existing touch terminals generate noticeable 'hissing' current noise when a user receives a voice call via an earpiece, degrading the user experience due to the cavity effect from the laminated structure of capacitive elements and devices at higher touch scan frequencies.
Innovation Solution
A method and system that detect when a user is receiving a voice call via an earpiece and switch the touch terminal from a higher first touch scan frequency to a lower second touch scan frequency, which may be 0 Hz, to reduce current noise, thereby moving the noise outside the human perceptible frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the touch terminal operates at a higher first touch scan frequency, then the touch response speed and scanning performance are improved, but the current noise becomes audible and degrades the user experience during voice calls
Solution Approach 1:
The patent applies dynamics by making the touch scan frequency adjustable rather than fixed. The system dynamically switches between the first touch scan frequency (higher, for normal operation) and the second touch scan frequency (lower, for noise reduction during voice calls). This allows the system to adapt its operating characteristics based on the current usage scenario, resolving the contradiction between speed and noise by optimizing the parameter for the active context.
Solution Approach 2:
The patent directly changes the touch scan frequency parameter to resolve the contradiction. By switching from the first touch scan frequency to the second touch scan frequency (which is lower), the system moves the noise out of the human perceptible frequency band during voice calls. This parameter change allows the system to maintain high performance during normal use while eliminating audible noise during sensitive operations like voice calls.
2Object-affected harmful factors
If the touch terminal switches to a lower second touch scan frequency during voice calls, then the current noise is reduced below the human perceptible frequency band, but the touch scan speed and response time are reduced
Solution Approach 1:
The system dynamically adjusts the touch scan frequency based on the detected usage scenario. During voice calls, it switches to the lower second frequency to reduce noise. When the voice call ends or the scenario changes, it switches back to the higher first frequency for optimal performance. This dynamic adjustment ensures that the speed reduction only occurs when necessary for noise reduction, minimizing the overall impact on user experience.
Solution Approach 2:
The system employs periodic switching between different operating frequencies based on detected conditions. The touch scan frequency is adjusted periodically according to whether a voice call is active, ensuring that the lower frequency (and associated noise reduction) is applied only during the specific period when it is needed, rather than continuously compromising performance.
3Object-affected harmful factors
If the touch terminal continuously monitors usage scenarios to switch frequencies, then the noise reduction effectiveness is improved, but the system complexity and processing overhead increase
Solution Approach 1:
The system uses feedback from usage scenario detection to control the touch scan frequency switching. By monitoring whether a voice call is active and providing this information to the frequency control logic, the system achieves effective noise reduction without requiring complex continuous analysis. The feedback mechanism allows the system to respond appropriately to changing conditions while maintaining relatively simple control logic.
Data Source
AI summary
A method and a system for reducing current noise of a touch terminal are provided. The method includes: determining that a user receives a voice call via an earpiece of the touch terminal, and controlling the touch terminal to switch from a first touch scan frequency to a second touch scan frequency, where the second touch scan frequency is less than the first touch scan frequency. As can be seen, if the user receives the voice call via the earpiece of the touch terminal, the touch terminal is controlled to switch from the first touch scan frequency to the second touch scan frequency, to effectively reduce the current noise heard by the user by decreasing the touch scan frequency of the touch terminal, so that the periodic current noise is outside a frequency band perceptible to a human ear, thereby improving user experience when receiving the voice call.