Sound Collecting Device Floating Microphone Array Vibration Isolation
Solution Overview
Problem
Ambisonics microphones face issues with vibration noise due to direct transmission of vibrations to microphone units, and existing solutions do not effectively maintain the accurate positioning and balanced floating support of microphone arrays with directional axes directed outward from regular polyhedrons.
Innovation Solution
A sound collecting device is designed with a microphone array supported by a frame member surrounded by elastic bodies, where the directional axes of microphone units are directed outward from a regular polyhedron, and the microphone array is floatingly supported in a balanced state using ring-shaped elastic bodies that connect the frame member and unit holders, preventing vibration noise and ensuring accurate positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a microphone array is directly fixed to a frame member, then the structure is simple and easy to manufacture, but vibration noise is transmitted directly to the microphone units
Solution Approach 1:
An elastic body is introduced as an intermediary component between the frame member and the microphone array. This elastic body serves as a vibration isolator that prevents direct transmission of vibrations from the frame to the microphone units, thereby reducing vibration noise while maintaining structural simplicity
Solution Approach 2:
The harmful vibration transmission path is extracted and separated from the main structure by using the elastic body to decouple the microphone array from the frame member, allowing the microphone array to be supported independently while still maintaining positional accuracy
2Object-affected harmful factors
If elastic bodies are used to support the microphone array in a floating state, then vibration noise is prevented, but accurate positioning of directional axes becomes difficult
Solution Approach 1:
Positioning protrusions and positioning grooves are provided in advance on the frame member and elastic body respectively. These pre-formed positioning features guide the elastic body into the correct position during assembly, ensuring that the microphone array is accurately positioned before the elastic body is deformed by tightening bolts
Solution Approach 2:
The elastic body is designed with built-in positioning features that cushion and guide the assembly process, preventing misalignment during installation. The positioning protrusions and grooves act as preliminary guides that maintain accuracy even as the elastic body deforms under bolt tension
3Measurement precision
If microphone units are arranged with directional axes directed outward from regular polyhedron faces, then stereophonic sound collection is achieved, but maintaining balanced floating support becomes complex
Solution Approach 1:
Multiple functions are merged into the elastic body: it simultaneously serves as a vibration isolator, a positioning mechanism, and a balancing support. The positioning protrusions and grooves combine alignment and support functions, while the elastic deformation provides both vibration isolation and balanced floating support for the microphone array
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 solution effectively suppresses vibration noise and maintains accurate sound collection by ensuring even distribution and angle of microphone units, resulting in highly accurate natural sound collection without positional deviations.
Implementation Method 1
an even number of ring-shaped elastic bodies that connect a part of the frame member and the unit holders connected to each other at a plurality of positions therebetween
Implementation Method 2
when vibration is transmitted to the mount member, the vibration is directly transmitted to each microphone unit through the bifurcated connecting member and the fixing member. This causes generation of vibration noise
Data Source
AI summary
A sound collecting device includes a microphone array having unit holders each of which a microphone unit is attached to. Connection of connecting portions formed on the holders to each other causes a directional axis of each microphone unit to be directed outward from a face of a regular polyhedron. The sound collecting devices further includes a frame disposed outside the microphone array so as to surround the microphone array and an even number of ring-shaped elastic bodies that connect a part of the frame and the connected holders at a plurality of positions such that the microphone array is positioned at a central portion of the frame, wherein a half of the even number of elastic bodies are connected twistedly in one direction from the frame toward the microphone array, and another half elastic bodies are connected twistedly in an opposite direction.