Sound Transducer Structure with Split Outlets for Noise Reduction
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Solution Overview
Problem
Electronic devices, such as mobile phones, experience airflow noise and piano tone issues due to their sound transducer structures, which are not effectively addressed in prior art.
Innovation Solution
A sound transducer structure with a housing, sound generator, and sound outlets, where a sound guiding groove connects the generator to separate sound outlets for receiver and loudspeaker modes, with a sound pressure sensitive member covering the loudspeaker outlet to split airflow and sound, reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single sound outlet is used for both receiver and loudspeaker modes, then the device structure is simple, but airflow noise and piano tone are generated in loudspeaker mode
Solution Approach 1:
The single sound outlet is divided into two separate outlets: a first sound outlet for receiver mode and a second sound outlet for loudspeaker mode. This segmentation allows each outlet to be optimized for its specific function, eliminating airflow noise and piano tone by preventing air flow through the receiver outlet during loudspeaker operation
Solution Approach 2:
Different outlets are provided with different characteristics: the first sound outlet is optimized for receiver mode without additional components, while the second sound outlet is covered with a sound pressure sensitive member (air-permeable spacer) that is specifically designed for loudspeaker mode operation. This local differentiation resolves the noise issue without compromising overall device simplicity
2Object-affected harmful factors
If sound is transmitted through the sound pressure sensitive member in loudspeaker mode, then airflow noise is reduced, but the sound pressure sensitive member may block sound transmission
Solution Approach 1:
An air-permeable spacer is used as the sound pressure sensitive member covering the second sound outlet. This porous material allows sound waves to pass through while restricting air flow, thereby reducing airflow noise and piano tone without significantly blocking sound transmission in loudspeaker mode
Solution Approach 2:
The sound pressure sensitive member changes its acoustic characteristics based on sound pressure levels. At high sound pressure (loudspeaker mode), the material becomes more permeable to sound, allowing efficient sound transmission. At low sound pressure (receiver mode), it remains relatively impermeable, preventing sound leakage through the second outlet
3Ease of operation
If the first sound outlet is used for receiver mode, then sound transmission to user's ear is direct, but sound may leak from the second sound outlet
Solution Approach 1:
The sound pressure sensitive member is selectively applied only to the second sound outlet, leaving the first sound outlet open and unobstructed. This local modification ensures direct sound transmission to the user's ear through the first outlet in receiver mode, while the sound pressure sensitive member prevents sound leakage through the second outlet by responding to low sound pressure conditions
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 reduces airflow and piano tone noise in loudspeaker mode while maintaining low sound and air pressure in receiver mode, facilitating a symmetrical sound field and improved sound quality.
Implementation Method 1
The second sound outlet is covered with a sound pressure sensitive member
Implementation Method 2
the sound pressure sensitive member is an air-permeable spacer
Implementation Method 3
A sound guiding groove communicates between the sound generator and the sound outlet, allowing a sound generated at the sound generator to be conducted along the sound guiding groove and transmitted out of the housing from the sound outlet
Data Source
AI summary
The present invention provides a sound transducer structure of electronic device relating to the technical field of acoustics. The sound transducer structure includes a housing having an accommodating cavity, a sound generator received in the accommodating cavity, and a sound outlet disposed in the housing. A sound guiding groove communicates between the sound generator and the sound outlet, so that a sound generated at the sound generator is conducted along the sound guiding groove and is transmitted out of the housing from the sound outlet. The sound outlet includes a first sound outlet for transmitting sound in a receiver mode and a second sound outlet for transmitting sound in a loudspeaker mode. The second sound outlet is covered with a sound pressure sensitive member.