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A new microphone system for near whispering.
Sungjoon Choi1, Wonkyu Moon, Jeong Hyun Lee
1Department of Mechanical Engineering, Pohang University of Science and Technology, San 31, Hyojadong Namgu, Pohang, Kyungbuk 790-784, South Korea.
The Journal of the Acoustical Society of America
|August 29, 2003
Summary
A novel microphone system effectively reduces mouth noise and enhances voice focus in loud settings. This technology enables clear whispering communication, even on mobile phones.
Area of Science:
- Acoustic engineering
- Signal processing
- Human-computer interaction
Background:
- Monitoring human voice in noisy environments presents challenges.
- Existing microphones struggle with air-blow effects and directional focus.
Purpose of the Study:
- To develop an advanced microphone system for clear voice capture near the source in noisy conditions.
- To introduce specialized functions for reducing air-blow effects and achieving focused sound reception.
Main Methods:
- Designed a wind filter with perforated plates to mitigate mouth air-blow effects.
- Implemented a four-microphone array with a novel signal-processing method for enhanced directivity.
- Developed a focusing mechanism for sound sources located close to the microphone system.
Main Results:
- Achieved up to 20 dB reduction in air-blow effects.
- Demonstrated a directional gain exceeding 4 dB.
- Validated the system's effectiveness through prototype performance tests.
Conclusions:
- The developed microphone system significantly improves voice monitoring in noisy environments.
- The system's performance is suitable for applications like whispering communication on mobile phones.