Acoustic System Correction Filter for Transmitted Sound Reduction

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Solution Overview

Problem

Existing acoustic systems, such as those described in PTL 1, can be improved in terms of reducing transmitted sound through vibration members.

Innovation Solution

The proposed acoustic system includes a sound generation device, a vibrator attached to a vibration member, and a correction filter that corrects the acoustic signal to reduce transmitted sound. The correction filter's filter property is derived based on the transfer characteristic of the transmitted sound, and it outputs the corrected acoustic signal to the vibrator.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a correction filter with filter property derived from transfer characteristic is used, then transmitted sound reduction is improved, but device complexity increases

Engineering Contradiction:

Improvetransmitted soundVSAvoidcorrection filter complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent replaces complex mechanical sound insulation structures with an acoustic signal processing system. Instead of relying solely on physical barriers to block sound, the system uses a correction filter that processes acoustic signals electronically to cancel transmitted sound waves, thereby reducing the need for complex mechanical structures.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The correction filter operates by measuring the transmitted sound through the vibration member and using this feedback information to generate an anti-phase signal. The filter property is derived from the transfer characteristic between the sound generation device and the measurement device, creating a closed-loop system that continuously adjusts to minimize transmitted sound.

Inventive Principle:

Principle #23Feedback

2Object-affected harmful factors

If active sound wave blocking is implemented, then sound insulation performance is improved, but energy consumption increases

Engineering Contradiction:

Improvetransmitted soundVSAvoidenergy consumption

Core Design Contradiction:

Object-affected harmful factorsVSUse of energy by moving object

Solution Approach 1:

The system converts the transmitted sound waves, which are normally considered harmful, into useful information for control. By measuring the transmitted sound and using it to generate anti-phase signals through the correction filter, the system turns the harmful transmitted sound into the basis for active noise cancellation, effectively converting the harm into a beneficial control mechanism.

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

This solution effectively reduces the amount of sound waves generated by the sound generation device that pass through the vibration member, enhancing sound insulation performance.

Implementation Method 1

a sound generation device that generates a sound wave based on an acoustic signal

Methodology Applied

Scientific EffectSound wave generation: Sound

Implementation Method 2

a vibrator that applies vibration to a vibration member to which the vibrator is attached

Methodology Applied

Scientific EffectVibration: Vibration

Implementation Method 3

a correction filter that (i) corrects the acoustic signal to reduce transmitted sound that has changed from the sound wave by transmitting through the vibration member

Methodology Applied

Scientific EffectAcoustic signal filtering: Filter (electronic)

Data Source

PatentUS20250193585A1Acoustic system, acoustic system control method, and acoustic system manufacturing method

Publication Date: 2025.06.12 PANASONIC AUTOMOTIVE SYST CO LTD

AI summary

An acoustic system includes: a sound generation device that generates a sound wave based on an acoustic signal; a vibrator that applies vibration to a vibration member to which the vibrator is attached; and a correction filter that (i) corrects the acoustic signal to reduce transmitted sound that has changed from the sound wave by transmitting through the vibration member, and (ii) outputs the acoustic signal corrected to the vibrator. The correction filter has a filter property derived based on the transfer characteristic of the transmitted sound.