David Robillard wrote: > On Sat, 2009-08-15 at 01:04 +0200, Fons Adriaensen wrote: >> On Fri, Aug 14, 2009 at 05:44:21PM -0400, David Robillard wrote: >> Another outcome of the Graz meetings is that the port groups >> that are currently named H#V# should really be named H#P#. >> The H#V# ones do also exist, but are different. I'll have to >> rename all existing AmbDec presets for the same reason. > > Do you have a link or anything about this? (What does the P stand for > etc)
the old approach to mixed order was to have a horizontal-only higher-order set and a first-order full periphonic set. that means if a source is on the horizontal plane, you benefit from the higher angular resolution of higher-order, but as soon as it moves up or down, you are back to first-order. bad. the new scheme as proposed by travis makes sure that you have full higher-order azimuthal resolution at all elevations, but only first-order elevational resolution. the only downside is that it uses more channels. the paper is here: http://ambisonics.iem.at/symposium2009/proceedings/ambisym09-travis-newmixedorder.pdf/at_download/file now that the important difference between those two approaches has been pointed out, it seems that the old shorthand notation needs to be changed. we used to write *3h1v*, which was supposed to mean 3rd-order horizontal, first-order vertical. but outside the horizontal plane, there is no 3rd order at all. so the correct new shorthand is *3h1p*, to be read "*3*rd-order *h*orizontal components, superimposed with a *1*st-order *p*eriphonic set". the improved scheme by travis will now be denoted as *3h1v*, which can be read as "*3*rd-order *h*orizontal resolution at all elevation levels, combined with *1*st-order *v*ertical resolution at all azimuths"... _______________________________________________ Linux-audio-dev mailing list [email protected] http://lists.linuxaudio.org/mailman/listinfo/linux-audio-dev
