Pneumatic Sound Isolation Testing for Microphones

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Solution Overview

Problem

Current sound isolation testing methods for microphones are inefficient, requiring significant setup time and environmental control, and are prone to misjudgment due to background noise and poor assembly gaps.

Innovation Solution

A sound isolation testing system using a gas pressure detector to inflate or deflate the microphone's sound hole to a target pressure, measuring the gas pressure change rate to calculate the sound isolation value, thereby reducing testing time and eliminating the need for extensive setup and background noise consideration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If traditional sound isolation testing method using sound signals and voltage measurement is employed, then sound isolation performance can be evaluated, but testing time is excessively long (around one hour) and requires complex device setup and environmental control

Engineering Contradiction:

Improvesound isolation evaluation accuracyVSAvoidtesting time

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent replaces the traditional acoustic testing system (sound source, microphone, voltage measurement) with a pneumatic system (gas pressure detector). Instead of using sound waves and electrical voltage measurements, the invention uses gas pressure changes to detect sound isolation performance, fundamentally substituting the measurement domain from acoustics/electrics to pneumatics

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention introduces a gas pressure detector to measure gas pressure changes within the microphone casing when the sound hole is blocked. By inflating or deflating the internal cavity and measuring the pressure change rate, the system evaluates sound isolation performance without requiring external sound sources or complex acoustic environments, reducing testing time from one hour to a few minutes

Inventive Principle:

Principle #29Pneumatics and hydraulics

2Measurement precision

If traditional sound isolation testing method is used, then sound isolation can be measured, but extensive device setup and environmental control are required

Engineering Contradiction:

Improvesound isolation measurementVSAvoidtesting system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces the complex acoustic measurement system (sound source, acoustic chamber, microphone, voltage signal processing) with a simple pneumatic system. The gas pressure detector directly measures pressure changes inside the microphone casing, eliminating the need for external acoustic equipment and complex signal processing chains

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention extracts the core measurement function from the complex acoustic testing environment and relocates it inside the microphone casing. By measuring gas pressure changes within the sealed cavity, the system removes the dependency on external sound sources, acoustic chambers, and background noise control, simplifying the entire testing setup

Inventive Principle:

Principle #2Taking out (Extraction)

3Measurement precision

If sound hole is blocked with clay and sound signals are emitted, then sound isolation can be tested, but background noise requirements and environmental control are necessary

Engineering Contradiction:

Improvesound isolation test accuracyVSAvoidbackground noise interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent replaces acoustic wave-based measurement with pressure-based measurement. Instead of emitting sound signals and measuring voltage responses that are susceptible to background noise, the system uses gas pressure changes to detect sound isolation, making the measurement immune to acoustic environmental interference

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention introduces gas as an intermediary medium to transfer the sound isolation effect into a measurable parameter. By filling the microphone casing with gas and measuring pressure changes when the sound hole is blocked, the system converts the acoustic isolation property into a pneumatic measurement, eliminating direct exposure to background noise

Inventive Principle:

Principle #24Intermediary (Mediator)

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 method allows for quick and accurate determination of sound isolation performance without the need for complex setup or environmental control, significantly reducing testing time and improving efficiency.

Implementation Method 1

The gas pressure detector determines a gas pressure change rate in the sound hole and calculates a sound isolation value of the product according to the gas pressure change rate

Methodology Applied

Scientific EffectGas pressure change rate measurement:

Implementation Method 2

The detection device includes a gas cover, wherein the sound hole is sealed by the gas cover

Methodology Applied

Scientific EffectGas sealing:

Data Source

PatentUS12117335B2Sound isolation testing system and sound isolation testing method

Publication Date: 2024.10.15 PEGATRON

AI summary

A sound isolation testing system and a sound isolation testing method are provided. The sound isolation testing system is adapted to test a product having a sound hole, and includes a detection device and a gas pressure detector. The detection device includes a gas cover, and the sound hole is sealed by the gas cover. The gas pressure detector is electrically connected to the detection device. The gas pressure detector determines a gas pressure change rate in the sound hole, and calculates the sound isolation value of the product according to the gas pressure change rate.