Acoustic Sensor Array Noise Elimination via Perpendicular Bisector Alignment
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Solution Overview
Problem
Existing noise elimination devices require a reasonably large interval between acoustic sensors to achieve high noise elimination performance, which increases the device size.
Innovation Solution
A noise eliminating device with an acoustic sensor array where the direction of the perpendicular bisector of a line segment connecting two adjacent sensors coincides with the noise source direction, allowing for high noise elimination performance with a small sensor interval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If acoustic sensors are arranged with a large interval to achieve high noise elimination performance using sound volume difference, then noise elimination performance is improved, but device size increases
Solution Approach 1:
The patent changes the arrangement parameter of acoustic sensors from conventional configurations to a specific configuration where the perpendicular bisector of the line segment connecting adjacent sensors aligns with the noise source direction. This parameter change enables effective noise elimination without requiring large sensor intervals, thus resolving the contradiction between measurement precision and device size
Solution Approach 2:
The patent employs asymmetric sensor arrangement relative to the noise source direction by aligning the perpendicular bisector with the noise source. This asymmetric configuration optimizes the noise elimination capability while maintaining compact dimensions, addressing the trade-off between performance and size
2Length of stationary object
If acoustic sensors are arranged with a small interval to reduce device size, then device size is reduced, but noise elimination performance deteriorates
Solution Approach 1:
By changing the arrangement parameters to the specific configuration where the perpendicular bisector aligns with the noise source direction, the patent achieves effective noise elimination even with small sensor intervals, thus resolving the contradiction between device size and noise elimination performance
Solution Approach 2:
The patent optimizes the local arrangement of acoustic sensors relative to the noise source direction, creating a configuration that maximizes noise elimination effectiveness in the specific region where noise originates, enabling compact device design without sacrificing performance
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 configuration accurately estimates the noise direction and provides enhanced noise elimination performance while minimizing sensor spacing, improving sound clarity and reducing device size.
Implementation Method 1
an acoustic sensor array including two or more acoustic sensors
Implementation Method 2
perform noise elimination using a time difference between observed signals obtained from multiple acoustic sensors
Data Source
AI summary
A noise eliminating device including: an acoustic sensor array including a first acoustic sensor at a vertex forming a vertex angle of an isosceles triangle, and second and third acoustic sensors at the other vertexes of the isosceles triangle, the first sensor being arranged on a bisector between two boundaries between a direction range in which a target sound source can exist and a direction range in which a noise source can exist; and the second and third sensors being arranged so that the boundaries coincide with a direction of a perpendicular bisector of a line segment connecting the first and second sensors, and a direction of a perpendicular bisector of a line segment connecting the first and third sensors; and a processor to use signals output from the sensors to output a signal obtained by enhancing sound from the target sound source and eliminating noise from the noise source.