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Example for modal analysis and sound field extrapolation
capture the sound field of a monochromatic plane wave by an open circular array
compute the circular harmonics expansion coefficients up to order
N
. As shown below, The CHT coefficientspm
is obtained by multiplying the regularized radial weightsdn
with the IDFT of the captured signalp
. No matrix computation is needed. The reason for using IDFT (not DFT) is due to our choice of the circular harmonics asnp.exp(-1j*n*phi)
.sfa-numpy/examples/sound_field_extrapolation_open_circular_array_mono.py
Lines 36 to 38 in 3da5e01
extrapolate the sound field on 2-dimensional grid points
sfa-numpy/examples/sound_field_extrapolation_open_circular_array_mono.py
Lines 40 to 43 in 3da5e01
results
CAUTION
One line in
regularize
was commented out so that it works for mono-frequency cases. This issue is being handled in #4.sfa-numpy/micarray/modal/radial.py
Lines 179 to 183 in 3da5e01