Ear Contact Detection for Dynamic Speaker Acoustic Adjustment
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Solution Overview
Problem
Existing speaker systems in electronic devices face challenges in accurately distinguishing between sealed and leak conditions, leading to variations in acoustic output and perceived sound quality, especially in miniature speakers like those in mobile devices, where detecting diaphragm movement is difficult.
Innovation Solution
The implementation of touch sensors around the speaker port to detect ear contact and estimate the degree of seal, allowing for dynamic adjustment of acoustic output based on the detected seal condition, thereby enhancing sound quality by attenuating or amplifying specific frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If diaphragm movement detection is used to distinguish sealed and leak conditions, then acoustic output adjustment is possible, but measurement precision deteriorates due to the very slight movement in miniature speakers
Solution Approach 1:
The patent introduces touch sensors as an intermediary element between the ear and the speaker port. Instead of directly measuring the difficult-to-detect diaphragm movement, the system uses touch sensors to detect ear contact and estimate seal degree. This intermediary approach transforms an imprecise measurement problem into a detectable touch contact problem, resolving the contradiction between adaptability and measurement precision.
2Adaptability or versatility
If touch sensors are used to detect ear contact, then seal condition estimation becomes possible, but device complexity increases
Solution Approach 1:
The patent leverages the existing touchscreen display as a multi-functional element. The touchscreen serves both its primary display function and as a touch sensor array for detecting ear contact around the speaker port. By making the existing component perform multiple functions, the patent achieves seal condition estimation without adding separate dedicated hardware, thus minimizing the increase in device complexity.
3Ease of manufacture
If speaker volume is adjusted based on contact pressure, then sound quality improves, but ease of operation deteriorates due to manual pressure application
Solution Approach 1:
The patent implements a self-service mechanism where the system automatically detects ear contact and estimates seal degree without requiring user action. The touch sensors continuously monitor contact conditions, and the processor automatically adjusts acoustic output based on the detected seal condition. This eliminates the need for users to manually apply pressure or interact with controls, resolving the contradiction between sound quality control and ease of 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
This solution effectively improves sound quality by dynamically adjusting the acoustic output to compensate for changes in seal conditions, providing a more consistent audio response across different orientations and environments.
Implementation Method 1
at least one touch sensor in fixed relation to the speaker port... detecting touch contact between an ear and at least one touch sensor
Data Source
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AI summary
A degree of seal of an ear about a speaker port may be estimated by detecting touch contact between the ear and at least one touch sensor in fixed relation to the speaker port. The degree of seal is estimated based on the detected touch contact. Based upon the estimated degree of seal, the acoustic output of the speaker may be adjusted. The adjustment may compensate for perceived changes to the quality of the acoustic output resulting from the degree of seal. The at least one touch sensor may be a plurality of touch sensors spaced around the speaker port. Each sensor may have a truncated wedge shape, with a narrow end closest to the speaker port.