On Tue, Mar 24, 2020 at 05:27:16PM +0100, Michael Jarosch wrote: > > Am 24.03.20 um 08:04 schrieb Jeanette C.: > > Mar 24 2020, Mitsch has written: > > > > Yes, first oder ambisonics also has four channels, known as W, X, Y and > > Z. But these don't mark speakers, they mark pressure (overall loudness) > > and three directions. > > It took a while, but I understand the basic mechanics of ambisonics, now > - at least, I hope so. > It's a bit sad, that there seems to be no "ambisonics for newbies" site > to make it a bit easier to dive into this… The "Using ambisonics with > Ardour"-page really helped a lot, although the plugins and input > descriptions do not match to what I was confronted with. > > > And so what ambdec does is decode one of the ambisonic formats into a > > particular speaker setup. > That's right - I just have to use a configuration in ambdec that matched > my speaker setup. I expected a configuration called "quadrophonic", but > I found a "square". Maybe quadrophonic is already occupied by another > surround systems nomenclature… Well, I'm fine with a "square"… > I would have made my own configuration, but I couldn't find the button > "new" in the configuration dialog, which was described in the manual of > the 0.4.2 version I've found on Fons' page. Is that handy tool given up > in later versions or am I too dump to handle it right? > >> Following instructions from https://community.ardour.org/ambisonics, > >> I added one mono track, bypassed the builtin panners and took (I > >> think it was) "AMB 1.1 mono panner" (couldn't find "1h1v"), added 2 > >> additional channels in "Master" to get 4 of them and let my mono > >> channel take the "Master" as an output. > > Again for clarity: there is a LADSPA plugin - also by Fons - called "AMB > > order 1,1 mono panner", which will do and is probably what you have > > used? > Yes! That's the right name. > >> Then I started ambdec and tried to make some sane connections, but > >> the inputs are not called "w", "x" and "y", but only "0", "1", "2", > >> and so on? > > As far as I can see, that's OK. Connect your four outputs to the first > > four inputs of ambdec. > > Yeah, I've tried that. Master 1,2,3,4 to ambdec 0,1,2,3 via "catia". > > By the way, @Fons, if he is watching that thread: I can't understand, > why counting in an audio application starts at "0". And I can't > understand why it seems better not keeping the ambisonics' nomenclature > for an ambisonics application… There may be reasons for this - maybe 3rd > order ambisonics complicates things, here? Nevertheless: Is it possible > to name the inputs at least by a number AND the corresponding ambisonics > channel name? That would be great! > > I made sure, that the outputs of ambdec are correctly connected, which > is easy to test with the internal test signal. But there are a few > things that let me think, I'm wrong with the inputs, here: > > * If the "mono panner" is in a neutral position (Azimuth: 0, Elevation: > 0), I would expect to get a signal from exactly in front of me. Instead > I get an output signal of LF and LB which is 20dB higher than RF and RB. > I can reach the signals position that corresponds to the one I expected > if I set Elevation to 90. But then, changing azimuth does nothing > (instead of - my expectation - circling around me while changing it). > > * Elevation: The Ardour page says, if there's no vertical dimension, I > shouldn't connect "z" - if I do that, ambdec changes it's reaction to > the "mono panners" values - but still it's not very intuitive to work > with. Or to be more precise: It's even getting worse… > > Conclusion: I'm sure, ambisonics is no rocket science, but the tools I'm > depending on getting ambisonics to work don't make it that easy… > > Greets! > Mitsch > _______________________________________________ > Linux-audio-user mailing list > Linux-audio-user@xxxxxxxxxxxxxxxxxxxx > https://lists.linuxaudio.org/listinfo/linux-audio-user _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user
