Speaker Array Wave Front Reproducibility via Listener-Driven Selection
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Solution Overview
Problem
In sound field formation using speaker arrays, wave fronts generated for different listeners interfere, reducing reproducibility and causing sound leakage, while increased numbers of speakers increase computation requirements for convolution processing.
Innovation Solution
A sound field forming apparatus that selects and drives only necessary speakers based on listener positional information to form a wave front, using wave front synthesis and filter coefficients, reducing interference and computation by optimizing speaker selection and signal generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If more speakers are used to increase sound field reproducibility, then wave front reproducibility is improved, but the amount of computation for convolution processing increases
Solution Approach 1:
The patent segments the speaker array into multiple groups, where each group is responsible for forming wave fronts for specific listener positions. By dividing the speaker array into segments and assigning different drive speakers to different listener regions, the system achieves good wave front reproducibility for multiple listeners simultaneously while reducing the number of speakers that need to perform convolution processing for each listener, thus lowering overall computation requirements.
2Area of stationary object
If more speakers are driven to form wave fronts for multiple listeners, then sound field coverage is improved, but wave front interference increases and reproducibility decreases
Solution Approach 1:
The patent applies local quality by assigning different drive speaker configurations to different spatial regions and listener positions. Each listener position has its own optimized set of drive speakers selected from the speaker array, allowing the system to provide high-quality wave front reproduction locally for each listener while maintaining overall sound field coverage across the entire listening area.
3Adaptability or versatility
If more speakers are used to serve multiple listeners, then directivity control flexibility is improved, but sound leakage between listeners increases
Solution Approach 1:
The patent extracts and utilizes the directional characteristics of individual speakers within the array by selectively designating specific speakers as drive speakers for each listener position. By taking out and optimizing the contribution of specific speakers rather than using all speakers uniformly, the system achieves flexible directivity control for each listener while reducing sound leakage to other listeners through more focused and efficient speaker utilization.
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
Improves wave front reproducibility by minimizing interference and computation, allowing for precise sound field formation with fewer speakers, thus enhancing sound quality and reducing processing load.
Implementation Method 1
The speaker drive signal may be a signal for forming the sound field by wave front synthesis.
Implementation Method 2
wave fronts generated to allow each listener to hear sound interferes with each other to decrease reproducibility of the wave front
Data Source
AI summary
Provided is a sound field forming apparatus and method to improve reproducibility of a wave front by using a smaller amount of computation. The sound field forming apparatus includes a listener position acquisition section that acquires listener positional information indicating a position of a listener, a drive speaker selection section that selects one or a plurality of speakers, as a drive speaker, used to form a sound field, among the speakers configuring a speaker array on the basis of the listener positional information, and a drive signal generation section that drives the drive speaker and generates a speaker drive signal for forming the sound field in accordance with a selection result of the drive speaker.