Speaker Box Auxiliary Cavity Resonance Control

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Solution Overview

Problem

The existing speaker boxes in portable devices suffer from limited high-frequency acoustic performance, resulting in harsh sound and poor sound quality due to their monotonous structure and restricted cavity space.

Innovation Solution

The speaker box design incorporates an auxiliary sound cavity, a baffle with a penetrating channel, and a sound absorber to increase cavity volume and flexibility, enhancing high-frequency performance by acting as a resonator and adjusting resonance sensitivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If the front cavity space is limited to the area opposite to the dome and the region of the sound guiding channel, then the structure is simple, but the high frequency acoustical performance is limited and sound quality deteriorates

Engineering Contradiction:

Improvestructure simplicityVSAvoidhigh frequency acoustical performance

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The front cavity is segmented into two parts: the original front cavity and an auxiliary front cavity. The auxiliary front cavity is formed by the baffle with the first through hole, which is communicated with the front cavity. This segmentation allows the system to maintain structural simplicity while improving high frequency acoustical performance through the additional cavity space and resonance control.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If the front cavity space is limited, then the manufacturing is easy, but the sound quality becomes poor with harsh sound and sharp lip sound

Engineering Contradiction:

Improvemanufacturing easeVSAvoidsound quality

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The baffle with the first through hole acts as an intermediary structure that connects the front cavity with the auxiliary front cavity. This intermediary element enables sound wave communication between the two cavities, improving sound quality and reducing harshness without complicating the manufacturing process.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Reliability

If excessive high frequency response is produced, then the speaker can reproduce high frequencies, but harsh sound, sharp lip sound and teeth sound occur

Engineering Contradiction:

Improvehigh frequency responseVSAvoidharsh sound and sharp lip sound

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The auxiliary front cavity and its communication channel with the front cavity create a resonance system that converts potentially harmful excessive high frequency responses into beneficial acoustic effects. The resonance controlled by the auxiliary cavity smooths out harsh sounds and sharp lip/teeth sounds, transforming what would be harmful acoustic characteristics into improved sound quality.

Inventive Principle:

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

Solution Approach 2:

The auxiliary front cavity changes the acoustic parameters of the speaker system by adding an additional volume and creating a resonance frequency. This parameter change allows the system to reproduce high frequencies more smoothly by distributing the energy across a broader frequency range, reducing the harshness and sharpness in the high frequency response.

Inventive Principle:

Principle #35Parameter changes

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

This design effectively improves high-frequency acoustic performance, reduces resonance peak sensitivity, and increases the versatility of sound quality, resulting in a more excellent acoustic experience.

Implementation Method 1

a sound absorber (6)

Methodology Applied

Scientific EffectSound absorption: Acoustic Absorption

Implementation Method 2

the auxiliary sound cavity (4) acts as a resonator of the front cavity (102)

Methodology Applied

Scientific EffectResonance: Resonance

Data Source

PatentUS10750274B2Speaker box

Publication Date: 2020.08.18 AAC TECHNOLOGIES PTE LTD

AI summary

A speaker box is provided in the present disclosure. The speaker box comprises a shell, a speaker, a sound guiding channel, an auxiliary sound cavity, a baffle, a cover plate and a sound absorber. The diaphragm of the speaker separates the receiving space into a front sound cavity and a rear cavity, the sound guiding channel communicates the front sound cavity with the outside. The auxiliary sound cavity is provided with the first through hole communicating with the front cavity and the second through hole communicating with the outside, and the baffle completely covers the first through hole. The baffle is provided with a channel, and the auxiliary sound cavity communicates with the front cavity through the channel. The cover plate covers the second through hole. Compared with the related art, the high frequency acoustic performance of the speaker box of the present disclosure is excellent.