Moving Microphone Array for Sound Source Direction Estimation
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Solution Overview
Problem
Existing information processing devices require a high density of sound collection portions to achieve high resolution in estimating sound source directions, leading to increased costs and device weight, while also being inefficient in terms of maintenance and wiring costs.
Innovation Solution
An information processing device that reduces the number of sound collection portions by using a single sound collection portion with positional information changes, estimating sound source directions based on frequency changes caused by the Doppler effect when the sound collection portion moves along a predetermined path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If many sound collection portions are installed with high density, then resolution in estimation of sound source direction is improved, but device weight and costs increase
Solution Approach 1:
The patent applies the dynamics principle by making the sound collection portion movable instead of using multiple fixed portions. The sound collection portion moves along a predetermined path to collect sounds from different positions, and the control unit processes these dynamic collection results to estimate sound source direction. This dynamic approach replaces the static multi-microphone array, reducing device weight while maintaining estimation resolution.
Solution Approach 2:
The patent changes the parameter of sound collection from spatial distribution (multiple fixed microphones) to temporal-spatial sequence (single moving microphone). By changing how positional information is gathered - through movement along a predetermined path rather than through simultaneous spatial distribution - the system achieves the same directional estimation capability with fewer components, thereby reducing weight.
2Measurement precision
If many sound collection portions are installed with high density, then resolution in estimation of sound source direction is improved, but costs increase
Solution Approach 1:
The patent applies the dynamics principle by making the sound collection portion movable instead of using multiple fixed portions. The sound collection portion moves along a predetermined path to collect sounds from different positions, and the control unit processes these dynamic collection results to estimate sound source direction. This dynamic approach replaces the static multi-microphone array, reducing device weight while maintaining estimation resolution.
Solution Approach 2:
The patent changes the parameter of sound collection from spatial distribution (multiple fixed microphones) to temporal-spatial sequence (single moving microphone). By changing how positional information is gathered - through movement along a predetermined path rather than through simultaneous spatial distribution - the system achieves the same directional estimation capability with fewer components, thereby reducing weight.
3Measurement precision
If many sound collection portions are installed with high density, then resolution in estimation of sound source direction is improved, but wiring and maintenance costs increase
Solution Approach 1:
The patent applies the dynamics principle by making the sound collection portion movable instead of using multiple fixed portions. The sound collection portion moves along a predetermined path to collect sounds from different positions, and the control unit processes these dynamic collection results to estimate sound source direction. This dynamic approach replaces the static multi-microphone array, reducing device weight while maintaining estimation resolution.
Solution Approach 2:
The patent changes the parameter of sound collection from spatial distribution (multiple fixed microphones) to temporal-spatial sequence (single moving microphone). By changing how positional information is gathered - through movement along a predetermined path rather than through simultaneous spatial distribution - the system achieves the same directional estimation capability with fewer components, thereby reducing weight.
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 approach allows for improved sound source direction estimation resolution while reducing the number of sound collection portions, thereby lowering costs and device weight, while maintaining effective noise suppression and target sound emphasis.
Implementation Method 1
estimating sound source directions based on frequency changes caused by the Doppler effect when the sound collection portion moves along a predetermined path
Data Source
AI summary
An information processing device including an acquisition unit that acquires a sound collection result of a sound from each of one or more sound sources obtained by a sound collection portion of which positional information indicating at least one of a position and a direction is changed and an estimation unit that estimates a direction of each of the one or more sound sources on a basis of a change in a frequency of a sound collected by the sound collection portion in association with a change in the positional information of the sound collection portion.