I have surfed around and pondered on how to create a low cost DIY multichannel sound outputs...
Ethernet to MADI ?? can it be done ? http://en.wikipedia.org/wiki/MADI http://comments.gmane.org/gmane.comp.audio.sursound/3076 http://groupdiy.com/index.php?topic=35486.120 OR use protocol for audio over Ethernet? http://www.supermac-hypermac.com/ Royalty-free implementations available as Xilinx FPGA cores DIY MADI to ADAT http://madi.webklik.nl/page/madi http://groupdiy.com/index.php?topic=35486.600 Use to this to interface directly to Ethernet or a RPi or maybe USB? http://www.xmos.com/en/startkit#D1WEaWZP 10/100 MII Ethernet MAC for XMOS microcontrollers http://xcore.github.com/sc_ethernet/index.html https://github.com/xcore/sc_ethernet Modules to receive and transmit ADAT streams http://github.xcore.com/sc_adat/ https://github.com/xcore/sc_adat http://www.diystompboxes.com/smfforum/index.php?PHPSESSID=aa2ced904ae477361c0eabd3c51c1908&topic=96073.20 http://opencores.com/project,adat_optical_feed_forward_receiver Or http://voxcaliber.com/is-dante-the-future-no-64-channel-digital-audio-over-ethernet-is-already-here/ 8 channel DAC - use 2 or 3 chips - around 100db S/N http://www.wolfsonmicro.com/documents/uploads/data_sheets/en/WM8768.pdf http://www.wolfsonmicro.com/products/dacs/WM8768/ http://www.wolfsonmicro.com/documents/uploads/misc/en/WAN0149.pdf Layout http://www.wolfsonmicro.com/documents/uploads/misc/en/WAN0129.pdf Stereo DAC better data http://www.wolfsonmicro.com/documents/uploads/data_sheets/en/WM8740.pdf http://www.cirrus.com/en/pubs/proDatasheet/CS4397_F1.pdf USB to I2S + DAC stereo 97$ http://www.silabs.com/products/interface/Pages/CP2114-WM8523EK.aspx Interesting DIY DAC http://www.audiodesignguide.com/DAC_final/DacFinal.html http://www.cirrus.com/en/products/cs4398.html 8 channels 117 db s/n Just a few places where it might be possible to find entry point if not everything is to be created out of nowhere. Bo-Erik Sandholm Stockholm ---------- http://www.xmos.com/en/startkit#D1WEaWZP http://www.diystompboxes.com/smfforum/index.php?PHPSESSID=aa2ced904ae477361c0eabd3c51c1908&topic=96073.20 -----Original Message----- From: Sursound [mailto:[email protected]] On Behalf Of Sampo Syreeni Sent: den 14 april 2014 22:21 To: Surround Sound discussion group Subject: Re: [Sursound] Inexpensive USB multichannel sound card On 2014-04-13, Ross Bencina wrote: > I am ignorant of the economics, but perhaps it is worth considering an > FPGA-based implementation: > > "An FPGA-based Re-configurable 24-bit 96kHz Sigma-Delta Audio DAC" > Ray C.C. Cheung et al. Worth a look because I'm not *too* well educated about the economics either, but my hunch is, that'd prove costly overkill. 1-4 channel high quality converters are already available as bulk product, at very low cost (to the tune of well under a buck per channel). What you really need after that is just the interface and synch circuitry, and whatever you need on the analog side for its interfaces, noise-free reference voltages, stable, low-jitter clocking and whatnot. Something like that doesn't take high end components like tightly integrated FPGA's and their support circuitry, but at most tightly integrated opamps, fuze programmable PAL/GAL/CPLD, and the ilk. Of course the rationale is much the same as with FPGA's -- the chip types I mentioned are basically just the smaller brothers of FPGA after all -- but the price point is much, *much* lower, in concordance with the lesser amount of stuff you have to implement yourself once the basic, hardest D/A stuff and even most of the interface logic was already bought in bulk, and since in this sort of an application, you really don't require reprogrammability (which takes at least an order of magnitude away from the cost). Now, this is obviously just another one of my wild ideas. It's highly unlikely I would be in the position to try it out, at least any time soon. There's still a rather hefty base investment when you do something like this. But sorta, kinda, I believe the basic economics ought to pan out; I don't think even ridiculous channel counts are mainly hard today because of the cost of production, but because of the low demand and the amortization problems it causes. If so, something like this would be one helluva match with circuit design class projects, Kickstarter-like nerdy crowdfunding, or the kind of hobbyist/researcher ecosystem we have even on this list. -- Sampo Syreeni, aka decoy - [email protected], http://decoy.iki.fi/front +358-40-3255353, 025E D175 ABE5 027C 9494 EEB0 E090 8BA9 0509 85C2 _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound
