Coaxial Sound Diffuser for Multi-Driver Loudspeaker
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Solution Overview
Problem
Loudspeakers with multiple drivers face space constraints when each driver requires separate sound production spaces, leading to inefficient use of space and suboptimal acoustic characteristics.
Innovation Solution
A coaxially located sound diffuser with distinct diffusion surfaces for each driver, including a circular protrusion and concave ring regions, reduces mutual impact between sound fields and minimizes space requirements while maintaining effective sound diffusion across frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate sound production spaces are designed for each driver, then acoustic characteristics are optimized, but space occupation increases significantly
Solution Approach 1:
The patent merges multiple sound production spaces into a single shared cavity. The sound diffuser is positioned at one end of the box body, serving as a common diffusion structure for both the first and second drivers. The first and second sound production spaces are integrated within the same box body, sharing the enclosed space rather than requiring separate enclosures.
Solution Approach 2:
The sound diffuser is segmented into distinct diffusion surfaces: a first diffusion surface facing the first driver and a second diffusion surface facing the second driver. Each diffusion surface has specific geometric features (concave and convex portions) tailored to the characteristics of the corresponding driver, allowing optimized acoustic diffusion for each frequency range within the shared space.
2Volume of stationary object
If a shared sound diffuser is used to reduce space, then space efficiency improves, but mutual impact between sound fields increases
Solution Approach 1:
Different regions of the sound diffuser have different geometric properties optimized for specific frequency ranges. The first diffusion surface has concave and convex portions designed for low-frequency diffusion from the first driver, while the second diffusion surface has different geometric features optimized for high-frequency diffusion from the second driver. This local differentiation reduces interference between frequency bands.
Solution Approach 2:
The sound diffuser employs curved geometric surfaces including concave portions and convex portions. These curved surfaces effectively diffuse sound waves in multiple directions, breaking up standing waves and reducing mutual interference between sound fields from different drivers within the shared enclosure space.
3Reliability
If separate sound diffusers are designed for each driver, then sound diffusion is optimized, but device complexity increases
Solution Approach 1:
The sound diffuser is designed as a multi-functional structure that serves both the first driver and the second driver simultaneously. A single sound diffuser component provides diffusion surfaces for both drivers, eliminating the need for separate diffuser structures and reducing overall device complexity while maintaining effective sound diffusion across different frequency ranges.
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
The sound diffuser enables smaller sound production spaces for multiple drivers, reducing intermodulation distortion and achieving optimal acoustic characteristics by diffusing sound waves efficiently across 360 degrees, thereby improving sound pressure levels and radiation efficiency.
Implementation Method 1
A sound diffuser is used for a driver of a loudspeaker, and is used to change sound transmission paths that are various of frequency ranges and that are generated by different drivers. It helps better radiating sounds to a free field around a loudspeaker, thereby increasing sound pressure levels and sound radiation efficiency in various frequency bands with 360 degrees directions.
Implementation Method 2
The first diffusion surface faces toward a first driver, and has a first central area that is a circular protrusion, a first outer ring region, and a first concave ring region located between the first central area and the first outer ring region. The second diffusion surface faces toward a second driver, and is a circular dish surface protuberant from center outwards.
Data Source
AI summary
This application provides a speaker and a sound diffuser thereof. The sound diffuser includes a first diffusion surface and a second diffusion surface. The first diffusion surface faces toward a first driver, and has a first central area that is a circular protrusion, a first outer ring region, and a first concave ring region located between the first central area and the first outer ring region. The second diffusion surface faces toward a second driver, and is a circular dish surface protuberant from center outwards. The sound diffuser is coaxially located between the first driver and the second driver, and the first driver and the second driver respectively generate different sound production frequencies.