Thanks a lot. I apology for not telling the status of the first order. It is normal. It has spatial filter effect but not very obvious. Also, The value of spherical harmonics by my script is the same as the one computed by the function of WOLFRAM(http://functions.wolfram.com/webMathematica/FunctionEvaluation.jsp?name=SphericalHarmonicYGeneral). To avoid mistaking the signal of different channels, today I have got the simulated signal by the method of SMIRgen (signal convolved with spherical microphone array impulse response, http://www.commsp.ee.ic.ac.uk/~dpj05/smirgen/) to process. After processed by beamforming of different orders, the output signal of 1st order is spatial filtered but not obvious. The signal of 2nd order is much better than 1st order, and the signal of 3rd order is a litter better than 2nd order. But the signal of 4th order doesn't show any spatial filter effect, even worse than 1st order. I had wondered whether it was caused by the orthogonal error of spherical array. And I have tried to minize the orthogonal error to get the orthogonal coefficient of different mic positions, but it failed to work better. Or do you think there is other reason for the problem. Thanks. ________________________________
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