An Inverse Microphone Array Method for the Estimation of a Rotating Source Directivity
Abstract
:1. Introduction
2. Methods
2.1. Virtual Rotating Array Method
2.2. Inverse Methods Based on CSM Modeling
3. Experimental Setup
3.1. Rotating Loudspeaker Array
3.2. Array Measurement
3.3. Simulation
4. Results
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
Abbreviations
AC | Alternating current |
CMF | Covariance matrix fitting |
CSM | Cross-spectral matrix |
RMS | Root mean square |
ROSI | Rotating source identifier |
SEM | Spectral estimation method |
SODIX | Source directivity modeling in the cross-spectral matrix |
VRA | Virtual rotating array |
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Number of microphones | 64 |
Spiral array aperture | m |
Sampling rate | kHz |
Measurement time | 40 s |
Array distance | m |
Test Case | Delay | Direction | Rotational Speed |
---|---|---|---|
1 | 0 | 0 rpm | |
2 | 0 | 205 rpm | |
3 | −2 | − | 205 rpm |
4 | 2 | 205 rpm | |
5 | 4 | 205 rpm |
VRA interpolation | Linear |
FFT block size | 1024 |
FFT window/overlap | von Hann / |
Focus grid points CMF | 41 × 41 |
CMF regularization | |
Focus grid points SODIX | 12 × 5 |
Number of SODIX iterations | 100 |
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Jekosch, S.; Sarradj, E. An Inverse Microphone Array Method for the Estimation of a Rotating Source Directivity. Acoustics 2021, 3, 462-472. https://0-doi-org.brum.beds.ac.uk/10.3390/acoustics3030030
Jekosch S, Sarradj E. An Inverse Microphone Array Method for the Estimation of a Rotating Source Directivity. Acoustics. 2021; 3(3):462-472. https://0-doi-org.brum.beds.ac.uk/10.3390/acoustics3030030
Chicago/Turabian StyleJekosch, Simon, and Ennes Sarradj. 2021. "An Inverse Microphone Array Method for the Estimation of a Rotating Source Directivity" Acoustics 3, no. 3: 462-472. https://0-doi-org.brum.beds.ac.uk/10.3390/acoustics3030030