TY - GEN
T1 - A wavenumber-fitting extrapolation method for FFT-based near-field acoustic holography using microphone array
AU - Liu, Benxu
AU - Ramachandran, Bremananth
AU - Khong, Andy W.H.
PY - 2011
Y1 - 2011
N2 - Near-field acoustic holography (NAH) is an important acoustic visualization technique which can be implemented efficiently through the fast Fourier transform (FFT). However, when the FFT is applied on a small measurement aperture via a microphone array, significant spectral leakage occurs. Windowing is often employed to reduce this leakage but at the expense of degradation in reconstruction performance due to the corruption of measured data, especially when the source is located around the edge of the sensor array. A wavenumber-fitting method is proposed to extrapolate the measurement aperture effectively. This is achieved by exploiting the wave equation using measurement aperture as the boundary condition. The quality of NAH source reconstruction is shown to be improved significantly using the proposed approach.
AB - Near-field acoustic holography (NAH) is an important acoustic visualization technique which can be implemented efficiently through the fast Fourier transform (FFT). However, when the FFT is applied on a small measurement aperture via a microphone array, significant spectral leakage occurs. Windowing is often employed to reduce this leakage but at the expense of degradation in reconstruction performance due to the corruption of measured data, especially when the source is located around the edge of the sensor array. A wavenumber-fitting method is proposed to extrapolate the measurement aperture effectively. This is achieved by exploiting the wave equation using measurement aperture as the boundary condition. The quality of NAH source reconstruction is shown to be improved significantly using the proposed approach.
KW - Extrapolation
KW - microphone array
KW - near-field acoustic holography
KW - wavenumber-fitting
UR - http://www.scopus.com/inward/record.url?scp=80051616159&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=80051616159&partnerID=8YFLogxK
U2 - 10.1109/ICASSP.2011.5946349
DO - 10.1109/ICASSP.2011.5946349
M3 - Conference contribution
AN - SCOPUS:80051616159
SN - 9781457705397
T3 - ICASSP, IEEE International Conference on Acoustics, Speech and Signal Processing - Proceedings
SP - 145
EP - 148
BT - 2011 IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2011 - Proceedings
T2 - 36th IEEE International Conference on Acoustics, Speech, and Signal Processing, ICASSP 2011
Y2 - 22 May 2011 through 27 May 2011
ER -