Hi,
Have you looked at any of Angelo Farina's recent work, which
essentially involves beamforming from an Eigenmike but without going
through the intervening step of spherical harmonics, which has some
advantages if you are looking at separating sound sources. A lot of
Angelo's work in the last few years has been with this in mind
recently. Particularly for what amount to very high performance "gun
mike" replacements, his team has been working with RAI, the Italian
broadcaster. http://pcfarina.eng.unipr.it/Public/Papers/252-AES-40.pdf
- note that they've a patent application in
http://www.faqs.org/patents/app/20120188434
Dave
On 26 December 2012 09:24, Chenrilin <chenri...@huawei.com> wrote:
> 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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--
As of 1st October 2012, I have retired from the University, so this
disclaimer is redundant....
These are my own views and may or may not be shared by my employer
Dave Malham
Ex-Music Research Centre
Department of Music
The University of York
Heslington
York YO10 5DD
UK
'Ambisonics - Component Imaging for Audio'
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