Wearable Voice Analysis with Distance-Based Sound Pressure Correction
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Solution Overview
Problem
The accuracy of voice analysis systems degrades due to changes in the distance between sound pressure sensors and the user's mouth, caused by factors like strap twisting, leading to inaccurate sound pressure detection.
Innovation Solution
A sound analysis system that includes sound pressure acquisition means, distance estimation means, and sound pressure correction means to estimate and correct sound pressures based on a distance correspondence map, function, and learning device, ensuring precise voice analysis by adjusting for changes in sensor positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sound pressure sensors are disposed at fixed positions on wearable equipment, then the structure is simple and easy to manufacture, but the distance between sensors and user's mouth changes due to strap twisting, degrading sound pressure detection accuracy
Solution Approach 1:
The system performs preliminary actions by acquiring sound pressures from multiple sensors before analysis, estimates distances based on these sound pressures, and calculates correction amounts in advance. This preliminary distance estimation and correction amount calculation enables the system to compensate for position changes before they significantly degrade measurement accuracy.
Solution Approach 2:
The system changes parameters by introducing distance estimation based on sound pressure ratios and applying correction amounts to compensate for distance variations. Instead of fixing the physical position of sensors, the system dynamically adjusts the acoustic measurement parameters through mathematical correction, maintaining detection accuracy despite physical position changes.
2Ease of operation
If the distance between sound pressure sensors and user's mouth changes, then ease of operation is improved (user can move freely), but sound pressure detection accuracy degrades
Solution Approach 1:
The system implements feedback by using sound pressure acquisition from multiple sensors to estimate distance, then using this distance information to calculate correction amounts that are applied back to the sound pressure measurements. This closed-loop feedback mechanism continuously compensates for distance variations, allowing users to move freely while maintaining measurement accuracy.
Solution Approach 2:
The system dynamically changes measurement parameters by calculating correction amounts based on estimated distances and applying these corrections to sound pressure values. This parameter adjustment allows the system to adapt to varying user positions and movements, maintaining accuracy despite changes in physical configuration.
3Reliability
If multiple sound pressure sensors are used at different distances, then voice analysis accuracy can be maintained through correction, but device complexity increases
Solution Approach 1:
The system applies segmentation by dividing the sound pressure measurement task across multiple sensors positioned at different distances. Each sensor provides partial information that, when combined with distance estimation and correction calculations, contributes to the overall reliable voice analysis result.
Solution Approach 2:
The system achieves universality by designing a multi-functional processing mechanism that handles both sound pressure acquisition and distance estimation using the same sensor array. The sound pressures serve dual purposes: direct voice analysis and distance-based correction, reducing the need for separate dedicated components.
Data Source
AI summary
A sound analysis system includes: first and second sound pressure acquisition means for respectively acquiring a sound pressure of a voice of a user and disposed in an equipment worn by the user at positions that differ in a distance from a mouth of the user under the state in which the user is wearing the equipment; distance estimation means for estimating a distance between either the first or the second sound pressure acquisition means and the mouth of the user based on the acquired sound pressures; and sound pressure correction means for calculating a difference between a reference value of the distance between the first or the second sound pressure acquisition means and the mouth of the user and the estimated distance, and correcting at least one of the sound pressures acquired by the first and the second sound pressure acquisition means based on the calculated difference.