Loudspeaker Array Arrangement for Wave Field Synthesis
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Solution Overview
Problem
Wave Field Synthesis (WFS) reproduction schemes require a large number of loudspeakers, making it difficult to install in limited spaces like homes, and struggle to provide stereophonic wave field reproduction suitable for large displays.
Innovation Solution
A loudspeaker array is arranged in two rows in front of and one row behind the listener, with sound source position analysis and rendering units to generate wave field synthesis signals, allowing for three-dimensional wave field localization and improved reproduction performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large number of loudspeakers are used for Wave Field Synthesis reproduction, then wave field reproduction performance is improved, but device complexity and installation difficulty increase in limited spaces
Solution Approach 1:
The loudspeaker array is segmented into multiple rows (front rows and back rows) with different functions. Front rows handle direct sound reproduction while back rows provide ambient/reverberant sound, allowing effective wave field synthesis with fewer total loudspeakers compared to traditional omnidirectional arrangements.
Solution Approach 2:
The patent transitions from traditional 2D horizontal loudspeaker arrangements to a 3D spatial configuration with multiple rows at different depths (front and back rows). This dimensional change enables effective wave field synthesis by utilizing both horizontal and depth dimensions, improving reproduction performance without proportionally increasing loudspeaker count.
2Reliability
If loudspeakers are arranged to surround the listener for optimal wave field reproduction, then reproduction performance is improved, but ease of installation deteriorates in narrow spaces
Solution Approach 1:
The patent extracts and separates different acoustic functions into different spatial locations. Front rows are positioned for direct sound reproduction while back rows are positioned for ambient sound, eliminating the need for complete 360-degree surrounding arrangements and simplifying installation in narrow spaces.
3Ease of operation
If traditional loudspeaker arrangements are used, then installation is simple, but stereophonic wave field reproduction performance suitable for large displays is not achieved
Solution Approach 1:
The system employs dynamic signal processing with different rendering techniques for different loudspeaker rows. Front rows use direct sound rendering while back rows use ambient sound rendering, with dynamic adjustment based on sound source position and listener characteristics, achieving high-fidelity reproduction for large displays while maintaining reasonable installation complexity.
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
Enables easy installation in homes and enhances stereophonic wave field reproduction for large displays by optimizing loudspeaker arrangement and directivity, improving the overall wave field reproduction performance.
Implementation Method 1
a rendering unit to output a wave field synthesis signal by performing a wave field synthesis rendering for the sound source based on the determined position of the sound source
Implementation Method 2
a plurality of loudspeakers to reproduce the wave field synthesis signal and to be arranged in two front rows
Data Source
AI summary
Provided is an apparatus and method for reproducing a wave field using a loudspeaker array. A loudspeaker array may be configured in front of and behind a listener, and a wave field synthesis rendering and a three-dimensional sound image localization rendering may be performed based on a position of a sound source.