Headset Microphone Housing for Stable ANC
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Solution Overview
Problem
Headphones with active noise compensation can experience instability and oscillation in the control loop due to varying ear anatomy, particularly when the microphone and playback transducer are in a small ear volume, leading to potential feedback whistling.
Innovation Solution
A headphone design featuring a housing with a defined acoustic volume around the microphone, connected to the ear volume through holes, and optionally a fabric gauze, to create a stable control system and prevent instability and feedback whistling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the microphone and playback transducer are placed in a small ear volume, then the headset fits better in the ear, but the control loop becomes unstable and oscillates
Solution Approach 1:
The housing is divided into a first housing section that encloses the microphone to form a defined acoustic volume, separating the microphone environment from the playback transducer area. This segmentation creates a stable acoustic chamber for the control microphone while maintaining overall compactness for ear fitting.
2Adaptability or versatility
If the ear anatomy varies between users, then the headset adapts to individual ears, but the active noise compensation becomes unstable
Solution Approach 1:
The defined acoustic volume in the first housing section provides a universal stable environment for the control microphone that works across different user ear anatomies. This standardized acoustic chamber ensures consistent control loop stability regardless of individual ear variations, while the overall headset design remains adaptable to different users.
3Device complexity
If the acoustic volume around the microphone is not defined, then the headset structure is simpler, but feedback whistling occurs
Solution Approach 1:
The first housing section is designed in advance to enclose the microphone and form a defined acoustic volume, preventing feedback whistling before it occurs. This preliminary structural arrangement establishes stable acoustic boundaries that eliminate the conditions for feedback oscillation.
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 defined acoustic volume and connected holes in the housing section stabilize the control loop, reducing the likelihood of instability and unwanted feedback whistling, ensuring effective active noise compensation.
Implementation Method 1
The defined acoustic volume is connected to the ear volume through at least one hole
Implementation Method 2
a fabric gauze is applied to the section delimiting the acoustic volume
Implementation Method 3
an electroacoustic playback converter
Implementation Method 4
a microphone for recording background noise
Data Source
Figure 1~2
Figure 3~4
AI summary
The invention relates to a headset comprising an electroacoustic sound transducer, a microphone (40) for recording noise, and an active noise compensating unit for compensating for noise based on the noise recorded by the microphone (40). The headset further comprises a housing (10) for receiving the microphone (40) and the electroacoustic sound transducer. The housing (10) further has a first housing section (50), which encloses at least the microphone (40) such that a defined acoustic volume is achieved.