Earset Inner Microphone Chamber Noise Isolation
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Solution Overview
Problem
Conventional earsets face challenges in transmitting clear audio in noisy environments due to external noise interference and microphone vibration, leading to reduced sound pressure at low frequencies.
Innovation Solution
The earset incorporates a duct structure within the housing to direct sounds from the Eustachian tube to the inner microphone, while a closed chamber and bracket configuration separate the sound reproducing unit from the microphone, preventing external noise and enhancing sound pressure by increasing the back hole size of the sound reproducing unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the back hole size of the sound reproducing unit is increased to improve low frequency sound pressure, then external noise transmission to the microphone increases
Solution Approach 1:
The housing is divided into separate functional chambers: a sound reproducing unit chamber and a microphone chamber. This segmentation allows the back hole of the sound reproducing unit to be larger for improved bass response, while the microphone chamber remains isolated to prevent external noise from reaching the microphone.
Solution Approach 2:
The microphone is extracted from the main housing body and placed in a separate microphone chamber. This extraction isolates the microphone from external noise sources while maintaining its ability to capture internal sounds through the dedicated sound transmission hole.
2Measurement precision
If the microphone is positioned close to the user's mouth to capture voice clearly, then external noise intrusion increases in noisy environments
Solution Approach 1:
The microphone is extracted from the conventional position near the user's mouth and relocated to a separate microphone chamber within the housing. This extraction protects the microphone from external noise while the sound transmission hole maintains clear voice capture from the Eustachian tube.
Solution Approach 2:
A dedicated sound transmission hole acts as an intermediary channel between the user's Eustachian tube and the microphone. This intermediary structure allows clear voice transmission while blocking external noise paths to the microphone.
3Measurement precision
If the microphone is positioned close to the user's mouth for clear transmission, then microphone vibration occurs when the user moves their body
Solution Approach 1:
The microphone is extracted from the unstable position near the user's mouth and fixed in a stable microphone chamber within the housing. This extraction eliminates body movement-induced vibration while the sound transmission hole maintains clear voice capture.
4Object-affected harmful factors
If the back hole of the sound reproducing unit is made small to prevent noise transmission, then vibration force at low frequencies is insufficient
Solution Approach 1:
The housing is segmented into separate chambers for the sound reproducing unit and microphone. This allows the sound reproducing unit's back hole to be larger for improved bass vibration while the microphone chamber remains isolated to prevent noise transmission.
Solution Approach 2:
A dedicated sound transmission hole serves as an intermediary structure that allows clear voice transmission to the microphone without requiring the back hole to be small, thus maintaining low frequency vibration force while preventing external noise intrusion.
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
This design effectively suppresses external noise, increases sound pressure by 6 dB or more at low frequencies, and reduces the muffled sensation caused by pressure differences, providing clearer audio pickup and minimizing howling during calls.
Implementation Method 1
a duct mounted in the housing, for transmitting sounds coming through the sound emitting hole to the inner microphone
Implementation Method 2
A housing 10 comprises a mounting space 11 in which components are mounted and an insertion tube 12 that is inserted into the external auditory canal
Implementation Method 3
the earset may further comprise a chamber forming a closed space that surrounds the inner microphone
Data Source
AI summary
Embodiments described herein provide an earset that has a chamber for effectively blocking external noise, with a sound reproducing unit and an inner microphone mounted in the chamber. According to an embodiment of the earset, the earset includes: a housing having a mounting space in which components are mounted and an insertion tube that is inserted into an external auditory canal of the user; a sound reproducing unit mounted in the mounting space and configured to emit sounds to the insertion tube; an inner microphone mounted in the mounting space; a chamber forming a closed space that surrounds the inner microphone; and a duct mounted in the chamber and configured to transmit sounds coming through the insertion tube to the inner microphone.