Microphone Acoustic Resonance Frequency Division

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Solution Overview

Problem

Traditional signal filtering and frequency division techniques in acoustic devices are complex, require high computational resources, and are affected by sampling frequency, leading to issues like signal distortion and noise introduction.

Innovation Solution

A microphone design incorporating an acoustoelectric transducer and an acoustic structure with a sound guiding tube and acoustic cavity, where the acoustic structure's resonance frequency differs significantly from the transducer's, allowing for efficient signal frequency division and improved sensitivity without complex hardware or software.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional hardware circuits are used for signal filtering or frequency division, then the filtering function can be achieved, but the hardware circuit structure becomes complex and is easily affected by electronic element characteristics

Engineering Contradiction:

Improvesignal filtering reliabilityVSAvoidhardware circuit structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces traditional electronic hardware filtering circuits with a mechanical acoustic structure consisting of a sound guiding tube and acoustic cavity. The acoustic structure uses physical acoustic resonance and impedance matching to achieve signal filtering and frequency division, eliminating the need for complex electronic circuits and improving reliability by removing sensitivity to electronic element characteristics.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Reliability

If software algorithms are used for signal filtering or frequency division, then filtering can be achieved, but computational complexity increases and high computing resources are required

Engineering Contradiction:

Improvesignal filtering reliabilityVSAvoidcomputational resources

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent substitutes software-based digital signal processing with a passive acoustic structure that performs filtering and frequency division through physical acoustic mechanisms. The sound guiding tube and acoustic cavity naturally filter frequencies through acoustic resonance and impedance effects, requiring no computational resources or energy consumption for processing.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Productivity

If traditional signal filtering techniques are used, then signal processing can be performed, but sampling frequency limitations cause signal distortion and noise introduction

Engineering Contradiction:

Improvesignal processing efficiencyVSAvoidsignal distortion and noise

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent applies acoustic filtering and frequency division before the signal is converted to electrical form by the acoustoelectric transducer. The acoustic structure pre-processes the sound signal in the acoustic domain, separating frequency components and filtering noise before transduction, thereby avoiding sampling-related distortion and noise that would occur in digital processing.

Inventive Principle:

Principle #10Preliminary action

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 proposed microphone achieves efficient signal frequency division, improves sensitivity and quality factor (Q value), and reduces complexity and production costs by utilizing structural parameters of the acoustic structure to filter and divide signals in real-time.

Implementation Method 1

The acoustic structure has a first resonance frequency, the at least one acoustoelectric transducer has a second resonance frequency, and an absolute value of a difference between the first resonance frequency and the second resonance frequency is not less than 100 Hz

Methodology Applied

Scientific EffectAcoustic resonance: Resonance

Implementation Method 2

The at least one acoustoelectric transducer is configured to convert a sound signal to an electrical signal

Methodology Applied

Scientific EffectAcoustoelectric transduction:

Data Source

PatentUS12207041B2Microphones

Publication Date: 2025.01.21 SHENZHEN SHOKZ CO LTD

AI summary

The present disclosure provides a microphone including at least one acoustoelectric transducer and an acoustic structure. The acoustoelectric transducer is configured to convert a sound signal to an electrical signal. The acoustic structure includes a sound guiding tube and an acoustic cavity. The acoustic cavity is in acoustic communication with the acoustoelectric transducer, and is in acoustic communication with outside of the microphone through the sound guiding tube. The acoustic structure has a first resonance frequency, the acoustoelectric transducer has a second resonance frequency, and an absolute value of a difference between the first resonance frequency and the second resonance frequency is not less than 100 Hz. By disposing different acoustic structures, resonance peaks in different frequency ranges may be added to the microphone, which improves a sensitivity of the microphone near multiple resonance peaks, thereby improving a sensitivity of the microphone in the entire wide frequency band.