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Spatially selective active noise control systems
Tong Xiao1, Buye Xu2, Chuming Zhao2
1Centre for Audio, Acoustics and Vibration, University of Technology Sydney, New South Wales 2007, Australia.
The Journal of the Acoustical Society of America
|May 3, 2023
Summary
This study introduces a novel multi-channel active noise control (ANC) system for enhanced spatial selectivity. The system preserves desired sounds while effectively reducing noise from unwanted directions, improving upon existing methods.
Area of Science:
- Acoustics
- Signal Processing
- Audio Engineering
Background:
- Traditional active noise control (ANC) aims for maximal sound reduction irrespective of sound direction.
- Existing methods struggle with desired sound preservation, often requiring separate reconstruction systems that introduce distortion and latency.
Purpose of the Study:
- To develop a multi-channel ANC system capable of selective noise reduction based on sound direction.
- To preserve desired sound signals without reproduction, thereby avoiding distortion and latency.
Main Methods:
- Implementation of a multi-channel ANC system with a spatial constraint on the hybrid ANC cost function.
- Utilizing a six-channel microphone array integrated into augmented eyeglasses for data acquisition.
Main Results:
- The proposed system successfully minimized noise originating from undesired directions.
- Effective noise control performance was maintained even with significant perturbation of the microphone array.
- The system demonstrated superior noise reduction compared to existing methods with reduced complexity.
Conclusions:
- The novel spatial constraint enables highly selective active noise control, preserving desired sound cues.
- This approach eliminates the need for complex sound reproduction, offering a more efficient and natural audio experience.
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