Rotatable Microphone Holders for Phase Difference Reduction
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Solution Overview
Problem
Existing voice recorders with right-and-left pair microphones require intricate operations and complex structures to switch between inward (X-Y) and outward (A-B) configurations, complicating the change between positions with significant phase difference.
Innovation Solution
A voice recorder design featuring a pair of microphones with holders that can turn 180 degrees on parallel rotation axes, allowing for easy switching between inward and outward positions without intricate operations, using an interlocking mechanism and specific offset and spacing arrangements to minimize phase difference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the microphones are arranged in the inward position (X-Y configuration) to reduce phase difference, then the phase difference between right and left microphones is reduced, but the structure becomes complicated requiring sliding and turning operations
Solution Approach 1:
The microphone assembly is divided into separate right and left microphone units, each mounted on its own holder that can rotate independently. This segmentation allows each microphone to be positioned optimally for reducing phase difference while simplifying the overall structure by eliminating the need for complex sliding mechanisms.
Solution Approach 2:
The holders of the microphones are designed to be rotatable relative to the body section, allowing dynamic adjustment between inward and outward positions. This rotational capability simplifies the structure compared to fixed or sliding mechanisms, while enabling the microphones to achieve the optimal inward position for phase difference reduction.
2Device complexity
If the microphones are arranged in the outward position (A-B configuration) for simple structure, then the structure is simplified, but the phase difference between microphones increases
Solution Approach 1:
The rotatable holders enable the microphones to dynamically switch between outward and inward positions. This dynamic capability allows the system to maintain structural simplicity while providing the option to achieve phase difference reduction when needed, resolving the contradiction between simplicity and precision.
Solution Approach 2:
The rotational angle of the holders can be adjusted to change the spatial arrangement parameters of the microphones. By controlling the rotation angle, the system can optimize the phase difference between microphones while maintaining a simple structural design, thus resolving the contradiction between structure simplicity and phase difference reduction.
3Adaptability or versatility
If sliding and turning operations are used to change microphone positions, then the microphones can switch between configurations, but the operation becomes intricate and complex
Solution Approach 1:
The rotatable holders provide a simple rotational operation to switch between inward and outward microphone configurations. This single rotational action replaces complex sliding and turning operations, significantly improving ease of operation while maintaining configuration switching capability.
Solution Approach 2:
The sliding operation is extracted and replaced by pure rotation of the holders. This simplification removes the complex sliding mechanism while retaining the ability to change microphone configurations, thus improving operational simplicity without sacrificing adaptability.
Data Source
AI summary
The voice recorder includes a right-and-left pair of microphones. Each microphone is fixed to a holder that is rotatable about a rotation axis, and a sound-collection axis of each microphone is tilted to the rotation axis. Turning each holder by 180 degrees allows each microphone to change over between an inward position where the sound-collecting axes SAX of the microphones intersect and an outward position where the sound-collecting axes do not intersect. Each microphone is placed offset from the rotation axis on each holder in such a direction that the sound-collecting axes are spaced apart from each other in a height-direction (Z-direction) while the microphones are in the inward position.