Earphone Nozzle Microphone Layout for ANC and High-Frequency Sound
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Solution Overview
Problem
Existing earphones lack improved acoustic performance, particularly in high frequency bands, and do not effectively incorporate Active Noise Cancellation (ANC) functions.
Innovation Solution
A sound device design featuring a housing with a nozzle, a transducer with a diaphragm, and a microphone positioned to enhance sound quality and ANC functionality, including a funnel-shaped structure to minimize sound reflection and a feedback microphone to adjust sound phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a microphone is placed inside the nozzle to enable ANC function, then noise cancellation capability is improved, but sound quality in high frequency band deteriorates due to sound reflection
Solution Approach 1:
The patent moves the microphone from the traditional internal position to the external surface of the nozzle, changing the spatial dimension of component arrangement. This allows the microphone to be positioned at the optimal location for capturing ambient noise while avoiding the sound reflection problems caused by internal placement, thus simultaneously achieving good ANC performance and high frequency sound quality.
Solution Approach 2:
The patent introduces a sound hole as an intermediary structure that allows sound waves to reach the microphone from the outside environment while maintaining the nozzle's structural integrity. This intermediary approach enables effective noise capture without compromising the acoustic performance of the high frequency sound output.
2Device complexity
If the nozzle inlet is positioned close to the transducer for compact design, then device size is reduced, but sound reflection degrades acoustic performance
Solution Approach 1:
The patent employs a curved inner surface in the nozzle structure, particularly in the region near the inlet. This curved geometry helps to redirect sound waves away from the transducer, reducing unwanted sound reflection while maintaining a compact overall device size. The curvature acts as an acoustic lens that optimizes sound path management without increasing device volume.
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 improves sound quality in high frequency bands by up to 16 dB and effectively cancels noise, providing enhanced acoustic performance and ANC capabilities.
Implementation Method 1
a transducer including a diaphragm and disposed in the inner space of the housing
Implementation Method 2
a microphone coupled to an inner surface of the housing adjacent to the inlet of the nozzle
Implementation Method 3
a nozzle protruding from the housing, the nozzle including an inlet which faces an inner space of the housing and an outlet which is opposite to the inlet
Data Source
AI summary
A sound device is provided. The sound device according to the present disclosure may include: a housing; a nozzle protruding from the housing, the nozzle including an inlet which faces an inner space of the housing and an outlet which is opposite to the inlet; a transducer including a diaphragm and disposed in the inner space of the housing; and a microphone coupled to an inner surface of the housing adjacent to the inlet of the nozzle.