Sound Emission Control Device With Variable Waveguide Openings

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Solution Overview

Problem

Conventional sound emission control devices struggle to adjust sound in a specific frequency range to achieve desired sound pressure.

Innovation Solution

A sound emission control device with a diffuser having a tapered shape and waveguides with varying opening distances around the diaphragm's central axis, allowing for adjustable sound propagation and diffusion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a conventional diffuser is placed in front of the speaker, then sound diffusion is achieved, but the ability to adjust sound pressure in a specific frequency range is lost

Engineering Contradiction:

Improvesound pressure adjustment capabilityVSAvoiddiffuser structure simplicity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The waveguide's opening portion has a distance from the central axis that varies in the circumferential direction, creating local variations in sound propagation paths. This allows different regions of the waveguide to affect different frequency components, enabling sound pressure adjustment in specific frequency ranges while maintaining a relatively simple overall structure.

Inventive Principle:

Principle #3Local quality

2Manufacturing precision

If the waveguide opening portion is positioned at a fixed distance from the central axis, then manufacturing is simplified, but sound pressure control in specific frequency ranges becomes difficult

Engineering Contradiction:

Improveopening position controlVSAvoidfrequency range adjustment

Core Design Contradiction:

Manufacturing precisionVSAdaptability or versatility

Solution Approach 1:

The opening portion of the waveguide is designed with asymmetric positioning relative to the central axis, with the distance varying in the circumferential direction. This asymmetric configuration enables control over sound pressure in specific frequency ranges by creating non-uniform sound propagation paths, while still allowing for precise manufacturing through defined geometric relationships.

Inventive Principle:

Principle #4Asymmetry

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 precise control of sound pressure in a specific frequency range, enhancing sound quality and efficiency of sound propagation.

Implementation Method 1

a diffuser having a tapered shape... configured to face a sound emitting surface of a diaphragm

Methodology Applied

Scientific EffectSound diffusion: Scattering

Implementation Method 2

a first waveguide having a first opening portion... to pass a sound emitted from the diaphragm, and to propagate the sound toward the diffuser

Methodology Applied

Scientific EffectSound propagation: Acoustics

Data Source

PatentUS20250330746A1Sound emission control device

Publication Date: 2025.10.23 YAMAHA CORP

AI summary

A sound emission control device includes: a diffuser having a tapered shape. The diffuser has a front end portion configured to face a sound emitting surface of a diaphragm. The sound emission control device further includes a first waveguide having a first opening portion. The first opening portion is configured to surround a central axis of the diaphragm, to pass a sound emitted from the diaphragm, and to propagate the sound toward the diffuser. The distance between an edge of the first opening portion and the central axis changes along a circumferential direction around the central axis.