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 <[email protected]> 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 <[email protected]> > >> To: Surround Sound discussion group <[email protected]> > >> > >> 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 > > [email protected] > > 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 > [email protected] > https://mail.music.vt.edu/mailman/listinfo/sursound > -- Gavin Kearney PhD, Lecturer in Sound Design Department of Theatre, Film and Television The University of York East Campus, Baird Lane York YO10 5GB, UK Tel: +44 (0)1904 32 5245 Fax: +44 (0)1904 32 5221 http://www.york.ac.uk/tftv/ http://www.york.ac.uk/tftv/staff/gavin-kearney/ EMAIL DISCLAIMER http://www.york.ac.uk/docs/disclaimer/email.htm -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20130926/9683ebf6/attachment.html> _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound
