Selective Sound Attenuation for Touch-Input Displays
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Solution Overview
Problem
Touch-sensitive display devices face challenges in minimizing unwanted sounds from input objects like styluses and fingers, which interfere with audio recordings and transmissions by incorporating these sounds into microphone systems.
Innovation Solution
The implementation of a sensing subsystem that detects conditions associated with touch inputs to predict contact times and apply selective sound attenuation, tailored to reduce or eliminate unwanted contact sounds by adjusting frequency-specific gains within the microphone system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If sound attenuation is applied to reduce contact sounds, then contact sound reduction is improved, but desired sound attenuation may also occur
Solution Approach 1:
The system performs preliminary detection of touch input conditions (pressure, location, object type) before the contact sound occurs. Based on this preliminary detection, it predicts the upcoming contact sound characteristics and pre-applies appropriate attenuation parameters, allowing selective reduction of harmful contact sounds while preserving desired sounds.
Solution Approach 2:
The system applies different attenuation characteristics to different frequency ranges and time periods. By analyzing the specific characteristics of contact sounds versus desired sounds, it applies localized attenuation only to the frequency bands and time windows where contact sounds dominate, leaving other frequencies untouched.
2Object-affected harmful factors
If frequency-specific gain adjustment is applied, then contact sound attenuation is improved, but system complexity increases
Solution Approach 1:
The system changes parameters (gain values, attenuation levels) based on detected touch conditions rather than using fixed complex filtering. By dynamically adjusting a limited set of parameters based on simple touch detection inputs, it achieves effective contact sound reduction without requiring complex microphone arrays or processing systems.
3Object-affected harmful factors
If time-limited attenuation is applied based on contact timing, then contact sound reduction is improved, but timing precision requirements increase
Solution Approach 1:
The system detects touch input conditions (pressure, location, object type) before the actual contact occurs. This preliminary detection provides advance notice of the upcoming contact timing, allowing the system to prepare attenuation parameters without requiring ultra-precise real-time timing detection of the contact moment itself.
Data Source
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AI summary
A display device comprises a sensing subsystem configured to detect one or more conditions associated with touch input to the display device occurring via a contact of an input object at a surface of the display device. The display device further comprises a microphone system configured to receive sound, a logic machine, and a storage machine holding instructions. The instructions are executable by the logic machine to determine, based on the one or more conditions, a time of the contact; determine, based on at least the time of the contact, sonic characteristics of the contact; and generate an audio output via applying a selective attenuation to process sound received into the microphone system. The selective attenuation is selected based on the sonic characteristics and applied over a time interval beginning at the determined time of contact.