Speaker Array Acoustic Radiation Control via Transfer Function Optimization
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Solution Overview
Problem
Existing sound bar systems fail to effectively control acoustic radiation directivity, leading to high sidelobe levels and a narrow sweet spot, requiring numerous speakers and not considering speaker orientation for enhanced listening surround experience.
Innovation Solution
A method and system that configure a speaker array by calculating transfer functions based on directivity and configuration, applying source strength to maximize acoustic radiation in desired zones while minimizing it in undesired zones, using an acoustic contrast control method and Finite Impulse Response filters to optimize sound pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If Delay and Sum methods are used to enhance listening surround experience, then virtual surround sound effect is generated, but sidelobe level cannot be restrained
Solution Approach 1:
The patent changes the parameters of acoustic radiation control by calculating transfer functions that incorporate speaker directivity characteristics and applying source strength optimization. This transforms the acoustic field distribution to maximize mainlobe levels while minimizing sidelobe levels, resolving the contradiction between generating virtual surround sound and restraining sidelobe levels.
2Quantity of substance
If a great number of speakers are used to enhance listening surround experience, then sound distribution is improved, but the sweet spot becomes narrower
Solution Approach 1:
The patent optimizes the acoustic radiation parameters by calculating transfer functions based on speaker configuration and directivity, and determining optimal source strength distribution. This enables effective sound distribution with fewer speakers while expanding the sweet spot width through controlled acoustic field manipulation.
3Device complexity
If existing methods are used without considering speaker directivity, then system complexity is reduced, but acoustic radiation control precision deteriorates
Solution Approach 1:
The patent performs preliminary calculation of transfer functions that incorporate speaker directivity characteristics before actual acoustic radiation control. By pre-computing the transfer functions based on speaker configuration and directivity measurements, the system achieves high precision acoustic radiation control without adding significant operational complexity.
Data Source
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AI summary
Acoustic radiation control method and system are provided. The acoustic radiation control method includes: configuring a speaker array； obtaining transfer functions of speakers in the speaker array based on configuration of the speaker array and directivity of the speakers； obtaining, based on the transfer functions of the speakers, source strength of the speakers which enables acoustic radiation of the speaker array in a first zone greater than acoustic radiation of the speaker array in a second zone； and applying the source strength of the speakers to the speaker array. By the method, acoustic radiation may be controlled more accurately, a sidelobe level may be constrained more effectively, and the number of speakers in the speaker array may be reduced.