Truncated Pyramid Speaker Cover for Directivity Control

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Solution Overview

Problem

Large venues face poor room acoustic environments due to long reverberation times and acoustic defects, leading to suboptimal sound quality even with advanced speakers, and outdoor venues suffer from sound energy overflow affecting adjacent performances.

Innovation Solution

A speaker cover with a truncated pyramid shape and hard board side boards incorporating sound absorption material, which directs sound waves to a specific area, reducing interference and sound pressure levels outside the designated zone.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If horn speakers or line array speakers with stronger directivity control are used, then sound directivity is improved, but sound clarity and quality cannot be obtained due to poor room acoustic environment

Engineering Contradiction:

Improvesound directivityVSAvoidsound clarity and quality

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The speaker cover acts as an intermediary device between the speaker and the room acoustic environment. It includes sound absorption material on its inner side walls to reduce reverberation and acoustic defects, while the hard board side boards provide directivity control. This intermediary structure allows the speaker to achieve both good sound clarity/quality and directivity control simultaneously.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The speaker cover applies different properties to different parts: the inner side walls are covered with sound absorption material to reduce reverberation, while the outer side boards are made of hard board material to provide directivity control. This local differentiation allows simultaneous optimization of sound quality and directivity.

Inventive Principle:

Principle #3Local quality

2Area of stationary object

If an array of speakers is used, then sound coverage is improved, but sound quality deteriorates compared with a single speaker

Engineering Contradiction:

Improvesound coverage areaVSAvoidsound quality

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

Instead of using an array of multiple speakers, the invention segments the function of a single speaker by adding a speaker cover with specific structural features (sound absorption material and hard board side boards). This allows one speaker to achieve both good sound quality and adequate sound coverage through the cover's directivity control.

Inventive Principle:

Principle #1Segmentation

3Power

If more sound energy is radiated at outdoor venues, then sound reinforcement is improved, but surrounding acoustic environment and adjacent performances are affected

Engineering Contradiction:

Improvesound energyVSAvoidsound energy overflow

Core Design Contradiction:

PowerVSObject-generated harmful factors

Solution Approach 1:

The speaker cover concentrates sound energy in a specific directional pattern through its hard board side boards, while the sound absorption material prevents unwanted reflections. This localizes the sound radiation to the intended area, preventing sound energy overflow to surrounding environments and adjacent performances.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The sound absorption material converts potentially harmful reverberation and reflected sound into beneficial acoustic damping, reducing unwanted sound energy in the surrounding environment while maintaining useful sound reinforcement in the designated area.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 speaker cover enhances sound clarity and quality by radiating sound waves directly to a designated area, minimizing acoustic defects and preventing sound energy overflow, thus improving sound reinforcement in large venues without affecting adjacent environments.

Implementation Method 1

at least part of an inner side wall of part of the side boards is provided with sound absorption material

Methodology Applied

Scientific EffectSound absorption: Acoustic Absorption

Implementation Method 2

the side boards are made of hard board material... the soundwaves emitted from the speaker are radiated to a designated area

Methodology Applied

Scientific EffectSound reflection: Reflection

Data Source

PatentUS12047736B2Speaker cover enabling directivity control of soundwave radiation

Publication Date: 2024.07.23 ZHU HENG

AI summary

A speaker cover enabling directivity control of soundwave radiation, containing a cover body having a truncated pyramid shape; the cover body is adapted to be provided with a speaker inside; the cover body is hollow, and is provided with an opening; the cover body has a base board and a plurality of side boards extending out from edges of the base board; a fixing unit is provided on the base board to fix the speaker; the side boards are made of hard board material; at least part of an inner side wall of each of the side boards is provided with sound absorption material.