The distance measurement is obviously more precise when using microphones. One camera could be used to find the speaker angles (relative to the listening position).
Gavin Kearney <gavin.kear...@york.ac.uk> a écrit : > Hi, > There has been many commercial products for 5.1 based on the notion of > self-calibration. > The idea that you hold a set-up microphone supplied by the > manufacturer at the listening position and then each speaker > generates a noise burst/tone/sweep in turn thereby determining > distance from listening position and level for phase alignment and > frequency dependent gain compensation respectively. > > See for example > http://www.sony.co.uk/product/hcs-home-cinema-receiver/str-dn1030/technical-specifications#tab > > Best, > Gavin > > > On 26 September 2013 05:14, David Worrall <worr...@avatar.com.au> > wrote: > > > Hi David, > > > > Thanks for your considered response. > > > > I _was_ actually thinking of it autolocating the speakers. And not > > necessarily just for ambisonics, actually. Some sort of a spectrum > > analyser/preamplifier device that derived the correct decode/gain > > controls of the real system acccording to the actual location of > > the loudspeakers, decode algorithm and your preferred listening > > spot ... and that self-callibrated each time you turned the system > > on. > > > > Given how difficult it seems to be for billions of people to set up > > a 5.1 system, surely there must be a market? > > > > I'm actually surprised that such a device doesn't already exist. > > Oh well, back to the stone-age method... > > > > David > > On 23/09/2013, at 9:33 PM, Dave Hunt wrote: > > > > > Hi, > > > > > >> Date: Thu, 19 Sep 2013 21:50:00 +0200 > > >> From: David Worrall <worr...@avatar.com.au> > > >> To: Surround Sound discussion group <sursound@music.vt.edu> > > >> > > >> Hi All, > > >> I'm away from my back-up of this list (*) so please forgive if > > >> this has > > been answered before, but > > >> > > >> Is there - on the market, or in other form - a setup system/tool > > >> that > > auto configures a decoder and calibrates an ambisonic playback rig > > according to the (actual) position of the loudspeakers? > > >> > > >> thanks, > > >> David > > > > > > Presumably it doesn't have to auto-locate the speakers ?? That > > > would be > > clever and probably expensive. > > > > > > I have something that was built in MAX/MSP, and can turn it into > > > an > > application (Mac OS preferred but Windows is probably possible). It > > is first order only, up to 16 speakers, and based on all the info > > about good decoders I've found, and can understand and implement. > > Of course it could be extended to higher orders, once the maths is > > thought through and the issue of different kinds of W. > > > > > > Haven't done this as most of the people I'm dealing with don't > > > have > > enough speakers to make it worthwhile or essential. It's basically > > part of something else which is trying to do all sorts of ambisonic > > things with 16 inputs from a DAW running on the same computer. So, > > until higher powered computers become affordable in an income > > challenged age, processing power has to be carefully used. > > Increasing the ambisonic order starts to push up the number of > > audio streams that need handling in a non-linear manner. Such a > > decoder needs listening to, which means that you have to able to > > generate something to listen to to assess how well the > > encode/decode works, something I haven't had time to do above 2nd > > order. > > > > > > If only there was more time, things got done quicker, or someone > > > was > > paying for the work by the hour. > > > > > > Ciao, > > > > > > Dave Hunt > > > _______________________________________________ > > > Sursound mailing list > > > Sursound@music.vt.edu > > > https://mail.music.vt.edu/mailman/listinfo/sursound > > > > > > > > > > > > -------------- next part -------------- > > An HTML attachment was scrubbed... > > URL: < > > https://mail.music.vt.edu/mailman/private/sursound/attachments/20130926/3ad4f0bf/attachment.html > > > > > _______________________________________________ > > Sursound mailing list > > Sursound@music.vt.edu > > https://mail.music.vt.edu/mailman/listinfo/sursound > > > > > _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
