For low cost multi-channel players with decoding and eq, it might be worth
investigating the ADAU1702 which is a complete single-chip audio system
with a 28-/56-bit audio DSP, ADCs, DACs, and microcontroller-like control
interfaces. It has 4 channel DAC's and 2 channel ADC's built in - plus you
can interface others. About 8 dollars in one offs. Alternatively, as I
have mentioned before, the ADAU1966 16 channel very high quality DAC
coupled with a Beagle Bone (or Board) would not be tooo expensive. I
actually have the bits to try it out but I'm too busy practising being
retired ( and collecting Wharfedale Diamond V's) :-)
Dave
On 16 April 2014 11:31, Bo-Erik Sandholm <[email protected]>wrote:
>
> 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
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>
--
As of 1st October 2012, I have retired from the University.
These are my own views and may or may not be shared by the University
Dave Malham
Honorary Fellow, Department of Music
The University of York
York YO10 5DD
UK
'Ambisonics - Component Imaging for Audio'
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