Hi Richard, The Ambisonic Toolkit includes an encoder that will take a set of directions and polar patterns and encode to FOA B-format.
The encoder is a simple "matrix only" encoding, and doesn't include coincidence correction and/or any other frequency dependent operations. As you'd expect, your results will vary depending on your microphone choices and arrangement. In particular, one issue you'll very likely experience is spatial aliasing beginning at mid-frequencies. Despite this, and depending on what you're after, you can still get very useful and musical sounding results. Especially if you follow your initial encoder with a spatial imaging transform. (E.g.," focus", to focus images on the frontal stage. Or, you can similarly push reverberation towards the rear.) See: http://www.ambisonictoolkit.net http://doc.sccode.org/Guides/Intro-to-the-ATK.html http://doc.sccode.org/Classes/FoaEncoderMatrix.html#*newDirections http://doc.sccode.org/Classes/FoaXformerMatrix.html#*newFocusX Also worth having a look with some example recordings made by Daniel Courville, see: D. Courville, "Comparative Surround Recording," Ambisonic Studio | Comparative Surround Recording, 2007. [Online]. Available: http://www.radio.uqam.ca/ambisonic/comparative_recording.html [Accessed: 26-Jul-2011]. Hope this helps, ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Joseph Anderson j.ander...@ambisonictoolkit.net http://www.ambisonictoolkit.net ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ On 5 Mar 2015, at 8:39 am, Ricky Graham <ri...@rickygraham.net> wrote: > Hi Everyone, > > Does anyone have any experience recording B-Format with multiple microphones > set to specific polar patterns (i.e. if you don’t have access to an ambisonic > / tetramic?). Is it possible? If so, what are some of the issues / problems > with this approach? > > Thanks, > > Richard > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit > account or options, view archives and so on. -------------- next part -------------- An HTML attachment was scrubbed... URL: <https://mail.music.vt.edu/mailman/private/sursound/attachments/20150305/dd4da56c/attachment.html> _______________________________________________ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound - unsubscribe here, edit account or options, view archives and so on.
