Thank you very much! Best wishes,
Ivica Ico Bukvic, composer & multimedia sculptor http://meowing.ccm.uc.edu/~ico/ > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:linux-audio-dev- > [EMAIL PROTECTED] On Behalf Of fons adriaensen > Sent: Saturday, May 28, 2005 10:18 AM > To: A list for linux audio users; The Linux Audio Developers' Mailing List > Subject: Re: [linux-audio-dev] Dumb question regarding CMT's ambisonic > plugins > > Helllo Ico, > > > I have been messing with the ambisonic plugins provided in the CMT > ladspa > > collection. I am namely looking into a simple implementation of B-format > > 1ch->4ch encoder. The problem is that I am failing to figure out how to > use > > this on a simple mono (non-encoded) sound input in order to control its > > diffusion over 4 channels. > > I'm not sure what you mean by diffusion. For a mono source, you basically > have two options: > > 1. Just send it to the B-format W channel, and not use X,Y,Z > > Thechnically that's not a 'legal' B format, but what you get is that > the sound will come equally loud out of all speakers. > > 2. Use a B-format panner to put it into a particular direction. > Remember that ambisonics encodes source direction, not position, > i.e. it does not include any notion of distance. This is normally > encoded by changing the direct / reflections / reverb ratios. > > Regarding the CMT set of ambisonics plugins, I remember having tested > some of them at least a year ago and the conclusion was they have some > problems. > > > When running it via Ardour and sending it to 4 > > separate busses via this plugin, even though the x, y, and z coordinates > do > > affect the output of the 4 channels, they do not conform to the expected > > 3,4,2,1 output (I presume these correspond to 4 speaker outputs, but I > am > > also having doubts about this as well, so your help in understanding > this > > better would be most appreciated). > > Seems like you need two things: > > 1. a B-format panner for ardour, so you can mix a number of mono inputs, > giving each of them a 'direction' and maybe (via additional outputs) > controlling their distance, and > > 2. a B-format to 4 speaker decoder following the master mixer strip. > > I have these things in house, and I'm using them all the time, but they > are not in a state suitable for release. They will be released some time, > and if you need them badly, I could change some priorities... > > OTOH, I remember you've been exploring SuperCollider recently, and that > has everything you need on board. Have a look at the PanB2, PanB and > DecodeB2 Ugens. > > -- > FA