Bone Conduction Microphone Dual Cavity Vibration Transfer
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Solution Overview
Problem
Bone conduction microphones in existing technologies have insufficient sensitivity and signal-to-noise ratio (SNR), which affects their performance in noisy environments.
Innovation Solution
A bone conduction microphone design featuring a housing with a circuit board and a vibration assembly that divides the containment space into two conduction cavities, utilizing a MEMS chip with a capacitive assembly and an ASIC chip to enhance vibration transfer and signal conversion, along with an electromagnetic shielding housing to improve sensitivity and SNR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional air conduction microphone is used, then the device is simple, but the sensitivity and signal-to-noise ratio are insufficient in noisy environments
Solution Approach 1:
The internal cavity is divided into a first conduction cavity and a second conduction cavity by the vibration assembly, with each cavity serving distinct functions in the vibration conduction path. This segmentation allows optimized vibration transfer while maintaining a compact overall structure.
Solution Approach 2:
The vibration assembly including the vibration member and frame is nested within the containment space formed by the housing and circuit board. The MEMS chip is further nested within the second conduction cavity, creating a compact nested structure that improves sensitivity without significantly increasing external dimensions.
2Measurement precision
If bone conduction microphone is used, then noise resistance is improved, but the sensitivity and signal-to-noise ratio remain insufficient
Solution Approach 1:
The vibration assembly acts as an intermediary between the bone conduction input and the MEMS chip. The vibration member transfers vibrations from the bone conduction path through the first conduction cavity to the MEMS diaphragm, while the frame provides structural support and defines the conduction cavities, ensuring stable and reliable vibration transfer.
Solution Approach 2:
The patent optimizes parameters such as the spacing between the vibration member and circuit board, the configuration of conduction cavities, and the positioning of the MEMS chip to enhance vibration transfer efficiency. These parameter adjustments improve sensitivity while maintaining performance stability across different operating conditions.
3Measurement precision
If complex vibration assembly is added to improve sensitivity, then the sensitivity increases, but the device complexity increases
Solution Approach 1:
The frame serves multiple functions: it connects the vibration member to the circuit board, defines the boundaries of the conduction cavities, provides structural support, and positions the MEMS chip. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity while still achieving improved sensitivity.
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 design significantly enhances the sensitivity and signal-to-noise ratio of the bone conduction microphone, providing improved sound quality and noise resistance in noisy environments.
Implementation Method 1
The bone conduction microphone converts the slight vibration of the bones of the head and neck caused by human speech into an electric signal
Implementation Method 2
a MEMS chip located in the second conduction cavity and fixed to the circuit board, and including a vibration diaphragm between the circuit board and the vibration member
Data Source
AI summary
The present invention provides a bone conduction microphone including a housing and a circuit board connected with the housing. The circuit board has an acoustic channel. The microphone further includes a vibration assembly forming a first conduction cavity and a second conduction cavity. The vibration assembly includes a vibration member and a frame. The frame, the vibration member and the circuit board form a first conduction cavity. The frame, the vibration member and the circuit board form a second conduction cavity. The vibration of the vibration member is conducted to one side of the vibration diaphragm, and is also conducted to the other side of the vibration diaphragm. Compared with the related art, the bone conduction microphone of the present invention can effectively improve the sensitivity and the signal to noise ratio.