Hello Alexis, A few things....
A) How were you planning on running your decoder? Write code from the ground up? Build your own hardware? If you're looking for something somewhat between 'off the shelf' and 'grow your own', you may like to have a look at the Ambisonic Toolkit package for SuperCollider. From the web page, "SuperCollider is a programming language for real time audio synthesis and algorithmic composition." The new and the older pages are here: http://supercollider.github.io/ http://supercollider.sourceforge.net/ The page for the Ambisonic Toolkit is here: http://www.ambisonictoolkit.net B) On your decoder arrangement... I'd suggest you think about the bi-rectangle arrangement, which uses 8 loudspeakers. This can work well in a domestic situation. Four loudspeakers are placed in the horizontal plane (in a rectangle), and then two more on the ceiling and two on the floor. Imagine two planes bisecting each other: one horizontal and one vertical. The ATK has a wide variety of inbuilt decoders. This page lists them: http://doc.sccode.org/Classes/FoaDecoderMatrix.html For a bi-rectangle, you'd use the diametric decoder. For two hexagons, you'd use the periphonic decoder. The ATK also includes Near Field Compensation and Psychoacoustic Shelf Filtering, allowing you to implement classic, optimised decoders. Additionally, because SuperCollider is a programming language for audio synthesis and signal processing, you also get delay lines and multipliers (gain adjustment) to compensate for differences in loudspeaker distances. Hope this helps!! My best, ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Joseph Anderson [email protected] http://www.ambisonictoolkit.net ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ On 16 Dec 2013, at 1:25 am, Alexis Shaw <[email protected]> wrote: > Hello All > > I am a long time lurker here, and have been interested in setting up an > ambisonic listening room in my house for some time. I have finally got the > courage to try, however the only room that I have available to use is > multi-use and only of moderate size 20m^2 (3940*4750*2690mm) In order to be > able to make the most of the space I have been thinking about using > moderately high end in-wall and in ceiling speakers in an rectangular > double-hexagon arrangement. > > My question here is two fold: > 1 - Do you think that this is at all a good or interesting setup. Even with > lots of work. I have a moderate undergraduate level of understanding of DSP > and and have read almost everything that I can get my hands upon about both > spherical harmonics and ambisonics and so feel able to write a custom > decoder if I have to. > > 2 - If the answer to the first question is yes, do you think that the > Noble-Fidelity L-85 LRCS (in ceiling) and L-82 (in wall lowers) would be an > appropriate speaker for this purpose. If not what speaker would you > recomend (if any). I am not attached to these speakers however I cannot > afford much more than USD 300 for each speaker. > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <https://mail.music.vt.edu/mailman/private/sursound/attachments/20131216/8a2b9c8d/attachment.html> > _______________________________________________ > 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/20131216/2485a933/attachment.html> _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound
