Re: [Sursound] Domestic Concert Hall
On 8 Jul 2012, at 13:10, Daniel Courville courville.dan...@uqam.ca wrote: AFAIK, there's no HOA IRs out there. As Fons said, you can upsample/upmix/uporder 1st order B-Format IRs with Harpex-B, but, even then, there's not many B-Format IRs around. Apple's Logic's SpaceDesigner reverb used to come with a bunch of B-format IRs. I mean, one really doesn't need that many, if all one does try is to create some realistic sounding ambience. If one wants to do auralization, one will likely have to either create a whole set of IRs for all location-listening position permutations, or synthesize them with appropriate software. The latter would be something that would be pretty cool: an add-on to 3D modeling software, that gives objects not just optical surface properties, but also acoustic ones. Then, in addition to cameras/light sources in the scene one could also place microphones and sound sources in the scene, and computer, in some sort of impulse wave tracing IRs to match that modeled environment, real or imagined. ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
[Sursound] higher order ambisonics
hi! mr gregory pallone just brought the mpeg-h workshop to the attention of the sursound mailing list: On 07/06/2012 01:33 AM, gregory.pall...@orange.com wrote: Hello, I'm new to this group (even if my colleague Jerome (Daniel) shares sometimes info about it) so I hope you will excuse my usage of this list for the following information and questions ... The MPEG audio group is about to start a standardization process in order to create a 3D audio codec. As 3D audio experts, you are welcome to assist freely to the MPEG-H 3D Audio Workshop in Stockholm on July the 18th (all details here: http://www.audioresearchlabs.com/mpeg-h-workshop/101-3D-AudioWorkshop.pdf) very interesting event! unfortunately, i have heard about it only now, and won't be able to attend on such short notice, but please keep me posted about future events if possible. This codec should have the ability to flexibly render an audio program to an arbitrary number of loudspeakers with arbitrary configurations. I think it could be a good opportunity to make it also support HOA format (as input of the audio encoder, output of the audio decoder, or both), and not only classical multichannel formats such as 5.1, 7.1, 10.2, 22.2... In this context, could you please send an email before July 11th to hoamilit...@gmail.commailto:hoamilit...@gmail.com indicating in just several sentences: - if you support HOA format as an input of the future 3D audio encoder, and why (what use-cases?) - if you support HOA format as an output of the future 3D audio decoder, and why (what use-cases?) i definitely support higher-order ambisonics as an internal data representation of a future 3D audio format, and also for input and output, because of its scalability and independence of loudspeaker layout. - please indicate also what is your point of view: content creator, capturing or rendering device manufacturer, researcher, developer ... besides my work as a sound designer, event engineer and audio consultant, i'm an independent researcher and recordist of HOA content. my arguments for the use of HOA can be found in some project reports i have published: a small jazz/pop production in HOA: http://stackingdwarves.net/public_stuff/linux_audio/lac2010/Field%20Report-A_Pop_production_in_Ambisonics.pdf a large contemporary classical production in HOA http://stackingdwarves.net/public_stuff/linux_audio/lac2012/J%c3%b6rn_Nettingsmeier-Field_Report_II-Chroma-Screen.pdf HOA as a solution to speaker layout incompatiblity: http://stackingdwarves.net/public_stuff/linux_audio/ambisonic_symposium_2010/nettingsmeier_ambisonic_systems_for%20electro-acoustic_concerts-rev3.pdf the size limits of large-scale HOA systems: http://stackingdwarves.net/public_stuff/linux_audio/ambisonic_symposium_2011/AmbiSym2011-Nettingsmeier-Dohrmann_Large-scale_HOA_Systems.pdf best regards, jörn -- Jörn Nettingsmeier Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487 Meister für Veranstaltungstechnik (Bühne/Studio) Tonmeister VDT http://stackingdwarves.net ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] higher order ambisonics over 8 to 10 loudspeakers
Hi everyone I have been gathering lots of ambient field recordings in A-Format for a few years using my SPS200 Soundfiled mike and a 788T. I have experimented with playback over an 8 channel circle, and also with 3 circles of 8 at different heights (roof, 3M, 1M), and some other arrangements. I am currently working on 2 dance works where I want to use some of this material and also spatialise other synthesized material. I have 8 Meyer UPJ-1 to use in the space and may be able to get 2 more for height (not certain adn these may not be available at all venues). I would like to achieve better localization than I have found easy to do using lower order playback and wonder if it is possible to undertake higher order playback with only 8 speakers? ALso would it make sense to have the speakers in the circle at different heights - would that allow a hint of the height information (I would tell the plugin where they are), or just distort the render? Thanks in advance for your advice Cheers, Garth Paine ga...@activatedspace.com -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20120709/011fa78f/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] higher order ambisonics over 8 to 10 loudspeakers
On 07/09/2012 01:17 PM, Garth Paine wrote: Hi everyone I have been gathering lots of ambient field recordings in A-Format for a few years using my SPS200 Soundfiled mike and a 788T. I have experimented with playback over an 8 channel circle, and also with 3 circles of 8 at different heights (roof, 3M, 1M), and some other arrangements. I am currently working on 2 dance works where I want to use some of this material and also spatialise other synthesized material. I have 8 Meyer UPJ-1 to use in the space and may be able to get 2 more for height (not certain adn these may not be available at all venues). try height, it will improve envelopment a lot, but don't expect any meaningful height localisation with only two speakers up there. here's my take on with-height surround: http://stackingdwarves.net/public_stuff/linux_audio/lac2012/day3_1000_The_why_and_how_of_with-height_surround_production_in_Ambisonics.ogv I would like to achieve better localization than I have found easy to do using lower order playback and wonder if it is possible to undertake higher order playback with only 8 speakers? yes. an octogon will give you wonderful third-order horizontal, which will provide very good localisation even for largish audiences, and very little phasing. to use your first-order recordings on an octogon, try the HARPEX decoder. there's some content it chokes on, but generally the results are very good. ALso would it make sense to have the speakers in the circle at different heights - would that allow a hint of the height information (I would tell the plugin where they are), or just distort the render? it will just distort the rendering, and compromise the horizontal precision. best, jörn -- Jörn Nettingsmeier Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487 Meister für Veranstaltungstechnik (Bühne/Studio) Tonmeister VDT http://stackingdwarves.net ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] higher order ambisonics over 8 to 10 loudspeakers
I cant remember the formula off hand but it important ,I am told, to use the correct number of speakers for the order you are using - so if you use too many speakers for the order that can also muddy up the localisation. Someone will enlighten us Im sure but is it : the order number + 1 squared ? If thats correct you should use 9 speakers for second order ? cheers, Gus On 9 July 2012 12:17, Garth Paine ga...@activatedspace.com wrote: Hi everyone I have been gathering lots of ambient field recordings in A-Format for a few years using my SPS200 Soundfiled mike and a 788T. I have experimented with playback over an 8 channel circle, and also with 3 circles of 8 at different heights (roof, 3M, 1M), and some other arrangements. I am currently working on 2 dance works where I want to use some of this material and also spatialise other synthesized material. I have 8 Meyer UPJ-1 to use in the space and may be able to get 2 more for height (not certain adn these may not be available at all venues). I would like to achieve better localization than I have found easy to do using lower order playback and wonder if it is possible to undertake higher order playback with only 8 speakers? ALso would it make sense to have the speakers in the circle at different heights - would that allow a hint of the height information (I would tell the plugin where they are), or just distort the render? Thanks in advance for your advice Cheers, Garth Paine ga...@activatedspace.com -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20120709/011fa78f/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20120709/0ff7109a/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] higher order ambisonics over 8 to 10 loudspeakers
that is for 3d by the way but not sure ... anyone ? On 9 July 2012 12:31, Augustine Leudar augustineleu...@gmail.com wrote: I cant remember the formula off hand but it important ,I am told, to use the correct number of speakers for the order you are using - so if you use too many speakers for the order that can also muddy up the localisation. Someone will enlighten us Im sure but is it : the order number + 1 squared ? If thats correct you should use 9 speakers for second order ? cheers, Gus -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20120709/205c5ec7/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] higher order ambisonics over 8 to 10 loudspeakers
Thanks for that feedback - I have HARPEX, but did not realise it does third-order horizontal? One drawback with Harpex is it does not do height Cheers Garth http://www.activatedspace.com http://www.syncsonics.com On 09/07/2012, at 9:27 PM, Jörn Nettingsmeier wrote: On 07/09/2012 01:17 PM, Garth Paine wrote: Hi everyone I have been gathering lots of ambient field recordings in A-Format for a few years using my SPS200 Soundfiled mike and a 788T. I have experimented with playback over an 8 channel circle, and also with 3 circles of 8 at different heights (roof, 3M, 1M), and some other arrangements. I am currently working on 2 dance works where I want to use some of this material and also spatialise other synthesized material. I have 8 Meyer UPJ-1 to use in the space and may be able to get 2 more for height (not certain adn these may not be available at all venues). try height, it will improve envelopment a lot, but don't expect any meaningful height localisation with only two speakers up there. here's my take on with-height surround: http://stackingdwarves.net/public_stuff/linux_audio/lac2012/day3_1000_The_why_and_how_of_with-height_surround_production_in_Ambisonics.ogv I would like to achieve better localization than I have found easy to do using lower order playback and wonder if it is possible to undertake higher order playback with only 8 speakers? yes. an octogon will give you wonderful third-order horizontal, which will provide very good localisation even for largish audiences, and very little phasing. to use your first-order recordings on an octogon, try the HARPEX decoder. there's some content it chokes on, but generally the results are very good. ALso would it make sense to have the speakers in the circle at different heights - would that allow a hint of the height information (I would tell the plugin where they are), or just distort the render? it will just distort the rendering, and compromise the horizontal precision. best, jörn -- Jörn Nettingsmeier Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487 Meister für Veranstaltungstechnik (Bühne/Studio) Tonmeister VDT http://stackingdwarves.net ___ 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] higher order ambisonics over 8 to 10 loudspeakers
On 07/09/2012 01:57 PM, Garth Paine wrote: Thanks for that feedback - I have HARPEX, but did not realise it does third-order horizontal? One drawback with Harpex is it does not do height you could do HARPEX on the 8 horizontal speakers, then take two virtual microphones, aim them into the upper part of your first-order b-format, run them through an allpass and maybe a bit of delay and mix the resulting signals to the upper speakers, to taste. not the canonical method, i do confess, but it will sound ok :) -- Jörn Nettingsmeier Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487 Meister für Veranstaltungstechnik (Bühne/Studio) Tonmeister VDT http://stackingdwarves.net ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] higher order ambisonics over 8 to 10 loudspeakers
On 07/09/2012 01:32 PM, Augustine Leudar wrote: that is for 3d by the way but not sure ... anyone ? there are no hard upper limits. the absolute lower limit is (N+1)². in horizontal layouts, i find 8 too much for first order, and 12 too much for third order. the issue is that additional speakers will create a more prominent phasing pattern. which might not be an issue if the audience is seated, but for walk-around environments, it's something to keep in mind. another (useless) datapoint: two rings of 18 and five in the ceiling is too much for third order periphonic :-D -- Jörn Nettingsmeier Lortzingstr. 11, 45128 Essen, Tel. +49 177 7937487 Meister für Veranstaltungstechnik (Bühne/Studio) Tonmeister VDT http://stackingdwarves.net ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] Domestic Concert Hall
CATT acoustic, Angelo's Ramsete, and many other programs do exactly that. acoustic 3d modelling. umashankar i have published my poems. read (or buy) at http://stores.lulu.com/umashankar From: r...@cubiculum.com Date: Mon, 9 Jul 2012 04:16:15 -0400 To: sursound@music.vt.edu Subject: Re: [Sursound] Domestic Concert Hall On 8 Jul 2012, at 13:10, Daniel Courville courville.dan...@uqam.ca wrote: AFAIK, there's no HOA IRs out there. As Fons said, you can upsample/upmix/uporder 1st order B-Format IRs with Harpex-B, but, even then, there's not many B-Format IRs around. Apple's Logic's SpaceDesigner reverb used to come with a bunch of B-format IRs. I mean, one really doesn't need that many, if all one does try is to create some realistic sounding ambience. If one wants to do auralization, one will likely have to either create a whole set of IRs for all location-listening position permutations, or synthesize them with appropriate software. The latter would be something that would be pretty cool: an add-on to 3D modeling software, that gives objects not just optical surface properties, but also acoustic ones. Then, in addition to cameras/light sources in the scene one could also place microphones and sound sources in the scene, and computer, in some sort of impulse wave tracing IRs to match that modeled environment, real or imagined. ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20120709/cce9480d/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] higher order ambisonics over 8 to 10 loudspeakers
On Mon, Jul 09, 2012 at 11:13:04PM +1000, GP wrote: If the min is (N+1)². Surely for 3rd order that is (3+1)² = 16 speakers? The minimum is (M + 1)^2 for 3D, and (2 * M) + 1 for 2D, but - You better use at least on more, - For 3D, the minimum is 8, even for first order. That is because the the equations above assume a systematic decoder, but a decoder should be systematic only at LF, and for anything based on energy vectors the angle between the speakers can't be too big. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow) ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] higher order ambisonics over 8 to 10 loudspeakers
IMHO it depends on how you're generating your decoder - using a fairly evenly spaced speaker layout that's roughly consistent with the order means that all the matrices in the maths end up well-behaved if you do a fairly simple matrix inversion. HOWEVER, it isn't obvious that this is the best way to do things in general, and can break quite badly for irregular rigs, e.g. if you have too few or many speakers for the order you're using, or if your speakers aren't spread evenly. ... so, if you're generating your decoder with relatively simple approaches (e.g. lightly conditioned pseudo-inverse), you'll probably get best results with a rig and order that are at least roughly in line in channel count. But I consider this to be a limitation introduced by the decoder method, rather than an intrinsic necessity. (Obviously, this is a lightly veiled plug for the Rapture3D decoder ;-) Best wishes, --Richard -Original Message- From: sursound-boun...@music.vt.edu [mailto:sursound-boun...@music.vt.edu] On Behalf Of Augustine Leudar Sent: 09 July 2012 12:32 To: Surround Sound discussion group Subject: Re: [Sursound] higher order ambisonics over 8 to 10 loudspeakers I cant remember the formula off hand but it important ,I am told, to use the correct number of speakers for the order you are using - so if you use too many speakers for the order that can also muddy up the localisation. Someone will enlighten us Im sure but is it : the order number + 1 squared ? If thats correct you should use 9 speakers for second order ? cheers, Gus On 9 July 2012 12:17, Garth Paine ga...@activatedspace.com wrote: Hi everyone I have been gathering lots of ambient field recordings in A-Format for a few years using my SPS200 Soundfiled mike and a 788T. I have experimented with playback over an 8 channel circle, and also with 3 circles of 8 at different heights (roof, 3M, 1M), and some other arrangements. I am currently working on 2 dance works where I want to use some of this material and also spatialise other synthesized material. I have 8 Meyer UPJ-1 to use in the space and may be able to get 2 more for height (not certain adn these may not be available at all venues). I would like to achieve better localization than I have found easy to do using lower order playback and wonder if it is possible to undertake higher order playback with only 8 speakers? ALso would it make sense to have the speakers in the circle at different heights - would that allow a hint of the height information (I would tell the plugin where they are), or just distort the render? Thanks in advance for your advice Cheers, Garth Paine ga...@activatedspace.com -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20120709/011f a78f/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20120709/0ff 7109a/attachment.html ___ 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] Domestic Concert Hall
Ralph I have created a suite of rooms in impulse response of varying size, shape and wall material. I have done this in Voxengo Impulse Modeler. I have created 5 frontal positions with early reflections and time values. There is a late reflections/reverberation stereo inpulses. I have learned to mix impulses from the same room with different mic placement and differing diffusion. The direct and early reflections give the location and change the signal from mono to stereo. The late room give ambience. This fall I am hoping to create a suite of B format rooms with the late reflections and some time consideration. This would be added to direct and early reflections which can be panned to pairs of speakers or other means of localization. While not WFS, I think that it will be very satisfactory. ThomasChen In a message dated 7/7/2012 7:16:12 P.M. Pacific Daylight Time, rglas...@yahoo.com writes: Using a new HP Pavillion HPE h8-1280t desktop Windows 7 PC with a solid state disk drive and RME ADAT sound cards I have been able to generate ambience signals for 26 surround speakers in essentially real time with only about 12 milliseconds of latency. The computer uses AudioMulch as the DAW with 13 iterations of the Waves IL-R VST plugin as the convolver. The library of concert halls and other hall impulse responses from Waves who include some originally from Angelo Farina is now so large that it occupies two DVDs. When running at 44.1 with a 2.0 input the computer load is only 39% so I may have overdone it.One can easily have up to 32 speakers using all 4 ADAT outputs. But basically what I have for the first time is a truly diffuse soundfield with a low IACC. That is, this is a sound field with at least some of the most important properties of a real concert hall. When you turn on the 26 speakers you get an enhanced sense of being there plus clarity, depth and realism in general. Since the Waves IRs do not really allow for partitioning the impulse responses to particular speakers, this system is not ideal, but I believe it can be shown that once a field is diffuse, but still with large interaural level and interaural time differences, most humans will accept the field as reasonably realistic even if it represents a concert hall that does not exist. One combines a selection of IRs from the same or similar halls to maintain the necessary diversity and prevent aliasing or monophonic impairments. Of course, now that I have done this it is clear that there are perhaps no more than three individuals in the world that would have the space, the skill, the money, and the love of classical music, to want to or be able to implement this. It is certainly not for solo electric guitar oriented stereophiles. However, I think serious music schools installing such a reproduction system would be able to evaluate their performances more realistically and conductors would be able to fine tune their technique etc. Getting the hall ambience this way certainly beats trying to record the hall during a performance and then delivering it via normal media along with the direct sound. Ralph Glasgal http://www.ambiophonics.org/ glas...@ambiophonic.org Note I have to use the Yahoo address because this list sofware does not like .org addresses. -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20120707/45dada93/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound -- next part -- An HTML attachment was scrubbed... URL: https://mail.music.vt.edu/mailman/private/sursound/attachments/20120709/393d232c/attachment.html ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] higher order ambisonics over 8 to 10 loudspeakers
Le 2012-07-09 09:17, GP a écrit : I did wonder about using Daniel Courville's plugins to do decoding for the height info separate to HARPEX. The HARPEX decoding does sound good ( how can I confirm it is 3rd order over 8 speakers?) and so if I could add height using another approach that would be good. I need to look at how to get height only from Daniel's plugs. The Harpex-B has a shotgun output mode with three presets for 3D: Octahedron, 3D 7.0 and Cube. You can use them or build your own 3D decoder with virtual shotguns (eight maximum) to accommodate an ad hoc installation. - Daniel ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
Re: [Sursound] higher order ambisonics over 8 to 10 loudspeakers
Fons Adriaensen wrote: for anything based on energy vectors the angle between the speakers can't be too big. Is there a good reference for that important point? Eric - Original Message From: Fons Adriaensen f...@linuxaudio.org To: sursound@music.vt.edu Sent: Mon, July 9, 2012 6:48:40 AM Subject: Re: [Sursound] higher order ambisonics over 8 to 10 loudspeakers On Mon, Jul 09, 2012 at 11:13:04PM +1000, GP wrote: If the min is (N+1)². Surely for 3rd order that is (3+1)² = 16 speakers? The minimum is (M + 1)^2 for 3D, and (2 * M) + 1 for 2D, but - You better use at least on more, - For 3D, the minimum is 8, even for first order. That is because the the equations above assume a systematic decoder, but a decoder should be systematic only at LF, and for anything based on energy vectors the angle between the speakers can't be too big. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow) ___ 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] Waveplayer - 16 chnl SD-card audio device
I meant: one D/A conversion I wrote: It's possible to skip the A/D conversion by using amplifiers with digital inputs. Texas Instruments have a 8 channels digital to PWM converter that can drive D-class amps with PWM inputs; that means only one A/D conversion, done by the speaker... http://www.ti.com/product/TAS5508C Marc Wed, 25 Apr 2012 15:51:02 +0100, Dave Malham dave.mal...@york.ac.uk a écrit : Hi Marc, True, I'm sure you could use a usb interface, but even a low cost multichannel unit would be quite a lot more expensive (and, probably, power hungry) than the PI whereas Analog Devices (for instance) do a 16 channel, 24 bit, 192kHz DASC IC for around 10 ukp (ADAU1966) which would probably need around another 20 quid's worth of op-amps and other bits to get going properly. Much more in the maker tradition - and a possible product. Dave PS total number of pre-orders for PI's have reach 350,000! PPS I'm not connected with them at all, I've not even ordered one! On 24/04/2012 18:33, Marc Lavallée wrote: The snd_bcm2835 driver is for the integrated stereo sound module. For more channels, a cheap 8 channels USB sound module would probably work, and ALSA drivers for many sound modules are stable. Martin Leesemartin.le...@stanfordalumni.org a écrit : Dave Malhamdave.mal...@york.ac.uk wrote: The Raspberry PI is really cheap and runs Linux, so it does provide some real possibilities, though it is, in some ways, quite limited - max 256m ram at present, for instance - ... it seems that the SPI pins are available on a standard header so shouldn't be too difficult physically to add DAC's or ADC's (since most use that interface), though how easy it would be to write the drivers, I don't know. The Arch Linux ARM image (operating system) contains an ALSA driver. However, it states: The alpha-quality ALSA driver included in this release is disabled by default. Type modprobe snd_bcm2835 to enable it. Regards, Martin ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
[Sursound] Analogue Ambisonic Decoders
Gerald Wilson g...@stonehill.org.uk Just checking: I assume no-one is manufacturing such devices anymore? Meridian currently include Ambisonic decoding in their surround sound boxes. (Although whether these are analogue comes down to definitions.) I am not familiar with Meridian's current offerings, and when I look on their website I just get confused. Hopefully, Richard E will chip in. Regards, Martin -- Martin J Leese E-mail: martin.leese stanfordalumni.org Web: http://members.tripod.com/martin_leese/ ___ Sursound mailing list Sursound@music.vt.edu https://mail.music.vt.edu/mailman/listinfo/sursound
