Speaker Boundary Detection Using Microphone Feedback Equalization

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Solution Overview

Problem

Nearby boundaries, such as walls or shelves, negatively affect the sound quality and response of compact loudspeakers, TV speakers, and soundbars by deteriorating their performance.

Innovation Solution

A speaker system equipped with a microphone detects nearby boundaries and adjusts its output to compensate for their influence, using impulse response analysis and equalization filters to maintain optimal sound quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If a compact loudspeaker is placed near boundaries (walls, shelves), then the speaker can be positioned in space-efficient locations, but the sound quality and response deteriorate due to boundary effects

Engineering Contradiction:

Improvespeaker placement flexibilityVSAvoidboundary effect on sound quality

Core Design Contradiction:

Volume of moving objectVSObject-affected harmful factors

Solution Approach 1:

The system uses a microphone to capture the actual acoustic response of the speaker in its environment, processes this feedback signal through an impulse response analyzer to detect boundaries, and automatically adjusts equalization filters to compensate for detected boundary effects, creating a closed-loop system that adapts to placement conditions

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system dynamically changes the frequency response parameters of the speaker output by applying equalization filters that adjust gain at different frequencies based on detected boundary conditions, transforming the acoustic characteristics to compensate for proximity effects without requiring physical repositioning

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If traditional speaker calibration methods are used, then manual adjustment can be performed, but the process is time-consuming and requires user intervention

Engineering Contradiction:

Improvecalibration accuracyVSAvoidcalibration time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The speaker system performs autonomous boundary detection and self-calibration using its built-in microphone and processing capabilities, automatically detecting boundaries through impulse response analysis and adjusting its own equalization parameters without requiring external measurement equipment or user intervention, thereby achieving both high precision and time efficiency

Inventive Principle:

Principle #25Self-service

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 system effectively improves sound quality by adapting to the speaker's surroundings, compensating for the negative effects of nearby boundaries on sound output.

Implementation Method 1

detecting, by a speaker system, including a microphone, one or more boundaries within a proximity to the speaker system

Methodology Applied

Scientific EffectSound wave reflection: Reflection

Implementation Method 2

The speaker system adjusts an output of the speaker system based on the one or more detected boundaries

Methodology Applied

Scientific EffectAcoustic equalization:

Data Source

PatentEP3827602B1Method and system for autonomous boundary detection for speakers

Publication Date: 2025.12.03 SAMSUNG ELECTRONICS CO LTD

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AI summary

A method includes detecting, by a speaker system including a microphone, one or more boundaries within a proximity to the speaker system. The speaker system adjusts an output of the speaker system based on the one or more detected boundaries. A sound quality of the speaker system is improved based on adjusting the output.