Re: [Sursound] status of ambisonia.com?
The bittorent seeder on Ambisonia.com is back online; some port was blocked. Thanks to Oliver Larkin for his help. -- Marc Mon, 16 Dec 2013 10:48:04 -0500, I wrote: Hi Jörn (and all) I'm in charge of Ambisonia (to some extent). Oliver Larkin is the contact at York. There's a seeder on the server, but it's not answering. I restarted the seeder, without success. I suspect that ports are being blocked from inside York; it happens from time to time... I'll send an email to Oliver. -- Marc Jörn Nettingsmeier netti...@stackingdwarves.net a écrit : hi *! what's the status of ambisonia.com? it appears that while the site is distributing torrent metadata, nobody is actually seeding the files. i'd be willing to set up a permanent seeder if someone can put me in contact with the current site admin (at york, i believe?). best, jörn ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
[Sursound] A gift for the 2014 Christmas?
I this something that can be done? We still don't have a simple low cost ambisonic hardware player, for first order in the initial implementation :-) Here is an half assed idea I would like someone to do for us/me - I know it would/will take years for me if i ever get it done. The hardware could be RPi with linux www.cmos.com/startkit RPi Pin compatible 8 core 300 MIPS DSP with GPIO or XMOS sliceCard connector 15 USD. http://www.pcm63.com/?182,ym3623b-digital-audio-interface-receiver-module- I2S to ADAT 25 USD/interface. Or https://ackspace.nl/wiki/ADAT_project implemented in multicore with 2(or more) TOSLink sender modules? Maybe we can have several I2S multichannel DAC's directly on a plugin card for the XMOS SliceCard interface? Choices to make, output connected to RPi or XMOS? ADAT directly on XMOS to Toslink or via I2S with more hardware. OR 2 x 8 channel DAC's connected to RPI or XMOS multicore I2S or other interface to DAC's. Software A version of linux for RPi Simple player can be recompiled to play multichannel files. http://offog.org/code/potamus/ http://mygeekopinions.blogspot.se/2011/08/how-to-install-potamus-music-player-in.html this how it looks! Files and directories can be added to the playlist by drag-and-drop, or by giving potamus command-line parameters on startup. Other players could ofcourse be used. Ambdec from http://kokkinizita.linuxaudio.org/linuxaudio/ Can the decoding and conversion to ADAT be done in the 8 xcore processor in the XMOS starterkit? Is the porting to XMOS DSP architecture easy and/or doable? A way to change the decoding parameters that is not overly complicated. Output via ADAT - to for example 2 of the Behringer ADA-8000, or using http://www.wavefrontsemi.com/index.php?id=11,10,0,0,1,0#productdocsoft or http://electronics.dantimax.dk/Kits/Digital_audio/index.html to convert to and from I2S. Choices to make, output connected to RPi or XMOS? ADAT directly on XMOS to Toslink or via I2S with more hardware? OR 2(or more) 8 channel DAC's connected to RPI or XMOS multicore via I2S or other interface for DAC's. Similar solutions can of course be implemented with other platforms but the start setup without audio interfaces is low cost and almost plug and play :-) with this hardware setup. Best Regards Bo-Erik Sandholm Stockholm Sweden ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] A gift for the 2014 Christmas?
https://www.xmos.com/en/support/downloads/xsoftip appearently XMOS have some kind of implementation or just designs for interfaces and application demos that might be portable to the start kit. Interfaces S/PDIF Transmitter ComponentxSOFTip_roadmap.zip I2S Master Audio Driversc_i2s.zip TDM Audio Driver ComponentxSOFTip_roadmap.zip ADAT TransmitterxSOFTip_roadmap.zip MIDI ComponentxSOFTip_roadmap.zip S/PDIF Receiver ComponentxSOFTip_roadmap.zip DSP Short-Delay Slicekit Audio Demosw_audio_effects.zip Long-Delay Slicekit Audio Demosw_audio_effects.zip Audio Long Delay-line Function Librarysw_audio_effects.zip Non-linear-gain Function Librarysw_audio_effects.zip BiQuad Function Librarysw_audio_effects.zip Audio Short Delay-line Function Librarysw_audio_effects.zip Long-Reverb Slicekit Audio Demosw_audio_effects.zip Short-Reverb Slicekit Audio Demosw_audio_effects.zip Reverb Function Librarysw_audio_effects.zip DSP Audio Utilities Function Librarysw_audio_effects.zip SDRAM_Reverb Function Librarysw_audio_effects.zip Loudness Slicekit Audio Demosw_audio_effects.zip BiQuad Filter SliceKit Audio Demosw_audio_effects.zip BR Bo-Erik -Original Message- From: Sursound [mailto:sursound-boun...@music.vt.edu] On Behalf Of Bo-Erik Sandholm Sent: den 20 december 2013 14:18 To: Surround Sound discussion group Subject: [Sursound] A gift for the 2014 Christmas? I this something that can be done? We still don't have a simple low cost ambisonic hardware player, for first order in the initial implementation :-) Here is an half assed idea I would like someone to do for us/me - I know it would/will take years for me if i ever get it done. The hardware could be RPi with linux www.cmos.com/startkit RPi Pin compatible 8 core 300 MIPS DSP with GPIO or XMOS sliceCard connector 15 USD. http://www.pcm63.com/?182,ym3623b-digital-audio-interface-receiver-module- I2S to ADAT 25 USD/interface. Or https://ackspace.nl/wiki/ADAT_project implemented in multicore with 2(or more) TOSLink sender modules? Maybe we can have several I2S multichannel DAC's directly on a plugin card for the XMOS SliceCard interface? Choices to make, output connected to RPi or XMOS? ADAT directly on XMOS to Toslink or via I2S with more hardware. OR 2 x 8 channel DAC's connected to RPI or XMOS multicore I2S or other interface to DAC's. Software A version of linux for RPi Simple player can be recompiled to play multichannel files. http://offog.org/code/potamus/ http://mygeekopinions.blogspot.se/2011/08/how-to-install-potamus-music-player-in.html this how it looks! Files and directories can be added to the playlist by drag-and-drop, or by giving potamus command-line parameters on startup. Other players could ofcourse be used. Ambdec from http://kokkinizita.linuxaudio.org/linuxaudio/ Can the decoding and conversion to ADAT be done in the 8 xcore processor in the XMOS starterkit? Is the porting to XMOS DSP architecture easy and/or doable? A way to change the decoding parameters that is not overly complicated. Output via ADAT - to for example 2 of the Behringer ADA-8000, or using http://www.wavefrontsemi.com/index.php?id=11,10,0,0,1,0#productdocsoft or http://electronics.dantimax.dk/Kits/Digital_audio/index.html to convert to and from I2S. Choices to make, output connected to RPi or XMOS? ADAT directly on XMOS to Toslink or via I2S with more hardware? OR 2(or more) 8 channel DAC's connected to RPI or XMOS multicore via I2S or other interface for DAC's. Similar solutions can of course be implemented with other platforms but the start setup without audio interfaces is low cost and almost plug and play :-) with this hardware setup. Best Regards Bo-Erik Sandholm Stockholm Sweden ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] BBC Proms recordings not UHJ encoded
Thanks for the correction. I will update the discography -Original Message- From: Sursound [mailto:sursound-boun...@music.vt.edu] On Behalf Of Eero Aro Sent: Thursday, November 28, 2013 8:08 AM To: sursound@music.vt.edu Subject: Re: [Sursound] [Bulk] Re: 45J recordings - did they / do they exist? Richard wrote: The BBC Proms CD is questionable. Tried one track and it certainly wasn't Matrix H. Would love to know who claimed it was H encoded. I think I'm the quilty one. Mark and I sometimes put releases in the list just to try if someone comes up with a better information about them. And now you did, after just slightly under 20 years from when Mark posted it. Not bad, eh?:-) Mark could move the BBC records under the rumoured-and-definitely-not- Ambisonics-category. The Discography actually lists two Last Night releases: - BBC Singers, BBC Symphony Chorus, BBC Symphony Orchestra, - Highlights from the Last Night of the Proms, cond. Sir Charles Groves, James Loughran. Live from the Royal Albert Hall, BBC Records CD 58OX (England), H-matrix. Tracks 1-2 recorded in Sept. 1977,Tracks 3-7 recorded 1982. The recordings on this CD conducted by Charles Groves were originally released on vinyl as Highlights from the Last Night of the Proms issued as BBC Records REH290. - Colin Davis - at the Last Night of the Proms. Philips 6588-011 (LP) This was the original release of the 1972 Proms concert. The CD with the same title appears to contain only a portion of the selections from the original lp [some of selections duplicate the 1969 recording but were performed again in 1972]. http://www.surrounddiscography.com/uhjdisc/uhjhtm.htm#Various I have the two CD:s, which are re-releases of vinyl LP:s. I might have one LP as well, although I would need to dig it out. My guess about the encoding was based on the fact that IBA made H-Matrix test radio transmissions during the same years, as those concerts were recorded. I know, that there is just a tiny small possibility that a recording would have been made after an encoder, but then again, if it was a surround recording, where else would you take a two channel output than after the encoder? I should now also dig out the magazine articles about the IBA tests. They are in the Motherlode, but Mother only knows, by which name. I did listen to the recordings both with an H-matrix and a UHJ decoder back in the nineties. They didn't sound bad at all to me as decoded. But now that we have a larger group of fresh ears, we can re-listen and decide whether they are Ambisonics or not. Please pay attention to that the re-releases contain tracks from different years. To your original question; I don't know of any 45J releases. Eero ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] Upcoming Android apps ambisonic related
I remember reading that, with exposure, human's audio-processing hardware can adapt to/learn how to use a non-optimal HRTF, given a bit of time. Does anyone have a reference for this? David On 15/12/2013, at 5:57 PM, Marc Lavallée wrote: Hi Dave. I never tried head tracking while listening to stereo or Ambisonics (I'm not that much of an insider). I'm optimistic about it, even with virtual microphones; but I suspect that the contribution of head tracking would then be limited to the interpretation of level differences and transitions between the left and right. What I miss is a realistic HRTF rendering experience (without head tracking). For every HRTF I tried (from the KEMAR and LISTEN sets), as with stereo, front sources were always in the head, not at the front; the front test tone was just louder then the rear one. I don't know what are the right conditions to experience good HRTF based localization (in a acousmatic context, without visual cues). I don't know if using a personal (measured) HRTF would be better; I just assume that it would be better because my own binaural recordings sound quite right, but probably just for me (to be verified) because I experienced the real sound scenes while recording them. -- Marc Sun, 15 Dec 2013 13:50:09 +, Dave Malham dave.mal...@york.ac.uk a écrit : Hi Marc, I think it is, perhaps, a little pessimistic to talk of needing to assess dozens of hrtf's to find the one that's right for for you, if you have head tracking in use. My experience with this dates back 20 years to the days of the Lake DSP Huron systems when I first heard this - even without specific hrtfs switching the the head tracking on was enough to change the system from not working (for me) to working. The head tracking (done with a Polyhemus sensor controlling the processing of FOA B format signals prior to decoding) was enough with no need to select hrtf's. I would suspect that having just a few to select from would be enough. Dave ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound __ Prof. Dr. David Worrall Emerging Audio Research (EAR) Audio Department International Audio Laboratories Erlangen Fraunhofer-Institut für Integrierte Schaltungen IIS Am Wolfsmantel 33 91058 Erlangen Telefon +49 (0) 91 31 / 7 76-62 77 Fax +49 (0) 91 31 / 7 76-20 99 E-Mail: david.worr...@iis.fraunhofer.de Internet: www.iis.fraunhofer.de Senior Adjunct Research Fellow, Australian National University. david.worr...@anu.edu.au -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20131221/90a012e3/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] Upcoming Android apps ambisonic related
On Fri, Dec 20, 2013 at 7:40 PM, David Worrall worr...@avatar.com.auwrote: I remember reading that, with exposure, human's audio-processing hardware can adapt to/learn how to use a non-optimal HRTF, given a bit of time. Does anyone have a reference for this? I don't know about 'non-optimal', but we can learn new ones by cross calibration with other senses, and apparently we don't forget the old ones. Aaron (hel...@ai.sri.com) Nature Neuroscience 1, 417 - 421 (1998) doi:10.1038/1633 Relearning sound localization with new ears Paul M. Hofman, Jos G.A. Van Riswick A. John Van Opstal University of Nijmegen, Department of Medical Physics and Biophysics, Geert Grooteplein 21, NL-6525 EZ Nijmegen, The Netherlands Correspondence should be addressed to A. John Van Opstal joh...@mbfys.kun.nl Because the inner ear is not organized spatially, sound localization relies on the neural processing of implicit acoustic cues. To determine a sound's position, the brain must learn and calibrate these cues, using accurate spatial feedback from other sensorimotor systems. Experimental evidence for such a system has been demonstrated in barn owls, but not in humans. Here, we demonstrate the existence of ongoing spatial calibration in the adult human auditory system. The spectral elevation cues of human subjects were disrupted by modifying their outer ears (pinnae) with molds. Although localization of sound elevation was dramatically degraded immediately after the modification, accurate performance was steadily reacquired. Interestingly, learning the new spectral cues did not interfere with the neural representation of the original cues, as subjects could localize sounds with both normal and modified pinnae. Full text at: http://www.nature.com/neuro/journal/v1/n5/full/nn0998_417.html -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20131220/4d9a2494/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
