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Bandwidth extension of intensity-based sound power estimates
Michael C Mortenson1, Suzanna Gilbert1, Tracianne B Neilsen1
1Brigham Young University, Provo, Utah 84602, USAmichaelcmort@byu.edu, ksco26@gmail.com, tbn@byu.edu, kentgee@byu.edu, scott_sommerfeldt@byu.edu.
The Journal of the Acoustical Society of America
|June 4, 2020
Summary
The Phase and Amplitude Gradient Estimator (PAGE) method improves sound power estimation accuracy. It overcomes traditional method limitations, providing precise measurements up to the spatial Nyquist frequency.
Area of Science:
- Acoustics and Noise Control
- Engineering and Applied Sciences
Background:
- Traditional intensity-based sound power estimation methods face bandwidth limitations.
- Microphone phase mismatch restricts low-frequency accuracy, while microphone spacing limits high-frequency performance.
Purpose of the Study:
- To evaluate the Phase and Amplitude Gradient Estimator (PAGE) method for sound power estimation.
- To compare PAGE against traditional methods using various sound sources.
Main Methods:
- Applied the PAGE method to sound power measurements for a reference source, blender, and vacuum cleaner.
- Compared PAGE-processed estimates with traditional and ISO 3741:2010 sound power measurements.
- Utilized ANSI S12.12-1992 (R2017) for intensity-based sound power estimation.
Main Results:
- Traditional methods underestimated sound power by 7-10 dB at the spatial Nyquist frequency.
- The PAGE method demonstrated accurate sound power estimation up to the spatial Nyquist frequency.
- PAGE performance remained accurate above the spatial Nyquist frequency with successful phase unwrapping.
Conclusions:
- The PAGE method significantly enhances the accuracy and bandwidth of intensity-based sound power estimation.
- PAGE offers a superior alternative to traditional methods, especially in challenging acoustic environments.
- This advancement is crucial for accurate noise control and engineering applications.
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