When you are converting from A to B-format are you going to FuMa or Ambix convention?
Generally most 1st order content is FuMa, so it will need to be converted to Ambix before your decode. Steve On 5 Jul 2017 23:11, "Martin Dupras" <martindup...@gmail.com> wrote: > I've deployed a 21-speaker near spherical array a few days ago, which > I think is working ok, but I'm having difficulty with playing back > some first order A-format recordings on it. They sound really very > diffuse and not very localised at all. I figured that some of you good > people on here might have some idea of where I might be going wrong or > what is not right. > > At the moment I'm using Reaper, and for decoding I'm using Matthias > Kronlachner's Ambix decoder plug-in, with a configuration that I've > calculated with Aaron Heller's Ambisonics Decoder Toolbox. I think the > decoder configuration is right. I've calculated it with ambix ordering > and scaling, and third order in H and V. The speaker array has six > speakers at floor level (-22 degrees elevation), eight at ear level at > 1m70 (0 degrees elevation), six at 45 degrees elevation and one at the > apex. > > Now: if I pan monophonic sources using a panner (e.g. o3a panner, 3rd > order), the localisation is pretty good. I've tested that with several > people by panning to random places and asking to blindly point out to > where they hear the source. Generally, they're in about the right > place (say within 45 degrees on average.) > > On the other hand, if I play 1st order A-format recordings (mostly > that I've made using our Core TetraMic), the localisation of sources > is pretty poor. I also tried with the "xyz.wav" example file from Core > (https://www.vvaudio.com/downloads) with the same results. To convert > from A-format to B-format, I've tried using Core's VVtetraVST plugin > with the calibration files for the mic (followed by the o3a FuMa to > Ambix converter), and the Senneheiser Ambeo plugin (which does the > same job, but in Ambix form already.) > > So what am I doing wrong? I've spent the last couple of days checking > everything thoroughly. I've calibrated all the speakers to within 1dB > SPL for the same signal received with an omni mic at the centre of the > sphere. I've triple-checked that the encoder is in the right channel > numbering: > > //------- decoder information ------- > // decoder file = > ../decoders/BSU_Array_6861_RAE1_3h3v_allrad_5200_rE_max_2_band.config > // speaker array name = BSU_Array_6861_RAE1 > // horizontal order = 3 > // vertical order = 3 > // coefficient order = acn > // coefficient scale = SN3D > // input scale = SN3D > // mixed-order scheme = HV > // input channel order: W Y Z X V T R S U Q O M K L N P > // output speaker order: S01 S02 S03 S04 S05 S06 S07 S08 S09 S10 S11 > S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 > > I'll welcome any suggestion or advice! > > Thanks, > > - martin > _______________________________________________ > 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/20170705/dd92c083/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.
