Dual Speaker Bass Reproduction with Phase Control

Solution Overview

Problem

Existing speaker apparatuses face challenges in reproducing bass without increasing size or weight, and in complex installation spaces where secure attachment is difficult due to vibration issues and space constraints.

Innovation Solution

A speaker apparatus comprising a first speaker and a second speaker, both with specific surfaces communicating or not communicating with the interior or exterior, integrated within a cabinet forming an enclosed space, along with a phase control unit generating sound signals of different phases to suppress vibration and enhance bass reproduction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a large enclosure is used to reproduce bass, then bass reproduction quality is improved, but installation space requirements increase

Engineering Contradiction:

Improvebass reproduction qualityVSAvoidenclosure volume

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The speaker system is divided into two separate speakers (first speaker and second speaker) with opposite orientations. Each speaker handles different aspects of sound reproduction, allowing bass reproduction without requiring a large single enclosure. The segmentation enables compact installation while maintaining bass quality.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The second speaker is inverted relative to the first speaker, with its sound-emitting surface facing the interior of the enclosure rather than the exterior. This inverted configuration allows the back surface of the first speaker and the sound-emitting surface of the second speaker to face each other, creating a compact bass reproduction system without large enclosure requirements.

Inventive Principle:

Principle #13The other way round (Inversion)

2Adaptability or versatility

If the enclosure thickness is reduced to fit complex installation spaces or reduce weight, then installation flexibility is improved, but attachment security deteriorates

Engineering Contradiction:

Improveinstallation flexibilityVSAvoidattachment security

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The opposite-oriented speakers are configured to counterbalance each other's vibrations. The first speaker and second speaker, facing opposite directions, create opposing vibration forces that cancel each other out, reducing overall vibration and improving attachment security even in thin enclosures with reduced attachment area.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

3Volume of moving object

If speakers are mounted with back surfaces facing each other in a compact enclosure, then enclosure size is reduced, but vibration increases

Engineering Contradiction:

Improveenclosure sizeVSAvoidvibration

Core Design Contradiction:

Volume of moving objectVSObject-generated harmful factors

Solution Approach 1:

The opposite-oriented speakers are configured to counterbalance each other's vibrations. The first speaker and second speaker, facing opposite directions, create opposing vibration forces that cancel each other out, reducing overall vibration and improving attachment security even in thin enclosures with reduced attachment area.

Inventive Principle:

Principle #8Anti-weight (Counterweight)

Solution Approach 2:

The second speaker is inverted relative to the first speaker, with its sound-emitting surface facing the interior of the enclosure rather than the exterior. This inverted configuration allows the back surface of the first speaker and the sound-emitting surface of the second speaker to face each other, creating a compact bass reproduction system without large enclosure requirements.

Inventive Principle:

Principle #13The other way round (Inversion)

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 effective bass reproduction without a large enclosure, reduces vibration, and facilitates secure attachment in limited spaces by using phase-controlled sound signals to manage diaphragm movement and air condensation within the cabinet.

Implementation Method 1

a phase control unit that generates first and second sound signals having different phases and supplies the first sound signal and the second sound signal to the first speaker and the second speaker, respectively

Methodology Applied

Scientific EffectPhase control:

Data Source

PatentUS11553271B2Speaker apparatus and acoustic system

Publication Date: 2023.01.10 YAMAHA CORP

AI summary

Provided is a speaker apparatus including a first speaker having a first surface communicating with an interior and a second surface not communicating with the interior; a second speaker having a first surface communicating with an exterior and a second surface not communicating with the exterior; and a cabinet having boundary surfaces that form an enclosed space. The second surface of the first speaker and the second surface of the second speaker are arranged on the boundary surfaces and are facing the enclosed space.