Microphone Acoustic Resonance Matching for Higher Sensitivity
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Solution Overview
Problem
Microphones exhibit limited sensitivity at their resonant frequency due to the intensity of resonance being relatively low for acoustoelectric transducers.
Innovation Solution
The microphone design incorporates an acoustic structure with a sound guiding tube and acoustic cavity, where the resonant frequencies of the acoustic structure and acoustoelectric transducer are aligned within 1000 Hz, allowing for enhanced sensitivity by amplifying frequency components near the resonant peaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an acoustoelectric transducer is used to convert sound signals, then the microphone can function as a transducer, but the sensitivity at resonant frequency remains low due to limited resonance intensity
Solution Approach 1:
The patent merges the acoustic resonance function with the acoustoelectric transducer by integrating an acoustic cavity and sound guiding tube directly into the transducer structure. The acoustic cavity is acoustically coupled to the diaphragm, allowing the mechanical vibration to be amplified through acoustic resonance before being converted to electrical signal, thus combining acoustic amplification with electroacoustic conversion in a single integrated structure.
Solution Approach 2:
The patent utilizes mechanical vibration resonance by designing an acoustic cavity with specific dimensions and a sound guiding tube that creates acoustic resonance at frequencies matching the transducer's resonant frequency. This resonance amplifies the mechanical vibration amplitude of the diaphragm, thereby increasing the output electrical signal strength and improving sensitivity at the resonant frequency.
2Reliability
If the resonant frequency of the acoustic structure is aligned with the acoustoelectric transducer, then sensitivity is improved, but the device complexity increases due to additional acoustic components
Solution Approach 1:
The patent implements nesting by placing the sound guiding tube and acoustic cavity within or integrated with the housing structure of the microphone. The acoustic components are nested within the existing device boundaries, sharing space with other microphone components, thereby reducing overall device volume and minimizing the addition of external structural elements.
Solution Approach 2:
The housing structure serves multiple functions: it provides mechanical protection, defines the acoustic cavity volume, supports the sound guiding tube, and facilitates acoustic coupling. By making the housing multi-functional, the patent avoids adding separate dedicated structures for each function, thereby reducing overall device complexity while achieving the desired acoustic resonance and sensitivity improvement.
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 alignment of resonant frequencies improves microphone sensitivity by amplifying frequency components near the resonant peaks, enhancing the Q value and overall performance.
Implementation Method 1
the acoustic structure has a first resonant frequency, the acoustoelectric transducer has a second resonant frequency, and an absolute value of a difference between the first resonant frequency and the second resonant frequency is not greater than 1000 Hz
Data Source
AI summary
The present disclosure provides a microphone comprising: an acoustoelectric transducer configured to convert an sound signal to an electrical signal; an acoustic structure, the acoustic structure comprising a sound guiding tube and an acoustic cavity, the acoustic cavity being acoustically communicated with the acoustoelectric transducer and acoustically communicated with the outside of the microphone through the sound guiding tube; wherein the acoustic structure has a first resonant frequency, the acoustoelectric transducer has a second resonant frequency, and an absolute value of the difference between the first resonant frequency and the second resonant frequency is not greater than 1000 Hz.