Hi, I work for VisiSonics; we design and build spherical microphone arrays. We are relatively new company, spun out of the University of Maryland. I thought one of our early papers could help. It has a lot of good information on beamforming. http://www.umiacs.umd.edu/~ramani/pubs/ZDG_i3esap2009.pdf
If you are interested, check out www.VisiSonics.com to see our array and/or email me and we can chat. Hope it helps, Conor On Mon, Jan 7, 2013 at 10:19 AM, Dave Malham <dave.mal...@york.ac.uk> wrote: > 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. > > ________________________________ > > > > 华为技术有限公司 Huawei Technologies Co., Ltd. > > [Company_logo] > > > > Phone: > > Fax: > > Mobile: > > Email: > > 地址：深圳市龙岗区坂田华为基地 邮编：518129 > > Huawei Technologies Co., Ltd. > > Bantian, Longgang District,Shenzhen 518129, P.R.China > > http://www.huawei.com > > ________________________________ > > 本邮件及其附件含有华为公司的保密信息，仅限于发送给上面地址中列出的个人或群组。禁 > > 止任何其他人以任何形式使用（包括但不限于全部或部分地泄露、复制、或散发）本邮件中 > > 的信息。如果您错收了本邮件，请您立即电话或邮件通知发件人并删除本邮件！ > > This e-mail and its attachments contain confidential information from > HUAWEI, which > > is intended only for the person or entity whose address is listed above. > Any use of the > > information contained herein in any way (including, but not limited to, > total or partial > > disclosure, reproduction, or dissemination) by persons other than the > intended > > recipient(s) is prohibited. If you receive this e-mail in error, please > notify the sender by > > phone or email immediately and delete it! > > -------------- next part -------------- > > An HTML attachment was scrubbed... > > URL: < > https://mail.music.vt.edu/mailman/private/sursound/attachments/20121226/b5470735/attachment.html > > > > -------------- next part -------------- > > A non-text attachment was scrubbed... > > Name: image001.jpg > > Type: image/jpeg > > Size: 6737 bytes > > Desc: image001.jpg > > URL: < > https://mail.music.vt.edu/mailman/private/sursound/attachments/20121226/b5470735/attachment.jpg > > > > _______________________________________________ > > Sursound mailing list > > Sursound@music.vt.edu > > https://mail.music.vt.edu/mailman/listinfo/sursound > > > > -- > 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' > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound > -- Conor Mulvey VisiSonics Corporation 387 Technology Dr. College Park, MD 20742 www.visisonics.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20130107/f4158885/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
