* Chenrilin <[email protected]> [2012-12-25 04:58]: > Hi, all > > I think there are somebody have worked about beamforming of spherical array. > Now I want to design the beampattern steering to certain direction and get > the signal from that direction (Sptial filtering). > I get the 32 channels signal p from Eigenmic. Get the Pnm of different orders > according to the spherical fourier transform. > And then weighted and sum all Pnm with the weight, > Wnm=Ynm(omiga)/(4pi*i^n*bn). Ynm is the spherical harmonics and n is the > order of it, omega is the look direction, and bn is the mode strength to > equalize different mode. In my simulation there is a > two voice in the directions 0 degree and 135 degree respectively. When the > order is set n=2, I get the output signal( signal from > the steering direction 0 degree). The voice from 0 degree is enhanced and the > voice from 135 degree is weakened. The > spatial filter takes effect. But when I set the order n=3, the signal is > heard just like the one of order n=2. And n=4, the signal > is even worse than the one n=2. It don’t have any spatial filter effect. > > Can anybody help check what is the main cause of the problem? Thanks advanced. Perhaps the thesis available at http://plessas.mur.at/rnd/rnd.html gives a good overview. best, P
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