That sounds awesome and very useful. This system was intended to be very, very low cost with home-theater grade DACs. The whole thing including processing and DACs is intended to be under $200 for up to 32 channels to put this stuff in the hands of high school and academic theaters, who could buy this and use it instead of an audio interface.
FPGA are great for this kind of thing because much of the heavy lifting can happen in parallel on the chip. Anyway, then I started doing larger scale stuff and sort of dropped the project. But all the pieces are still there... Ben On Thu, May 23, 2013 at 9:38 AM, Alexis Shaw <alexis.s...@gmail.com> wrote: > I'm working on having this implement a 4th order ambisonic decoder. > > The cool thing here is that there is a dual core arm processor on board > that can > run linux, so I can have a 40 or more channel hardware interface and > have it act as > an output that takes a 4th order ambisonic signal from software. Or at > least that is > the idea. > > There actually seems to be enough io to output to well over 100 channels. > And there > Is a heap of DSP resources on this thing. > > I don't know how popular this would be or how much time it will take, > however there > Is a huge amount that can be done here. > > On Thursday, May 23, 2013, Ben Bloomberg wrote: > > > I have some FPGA code to drive 4 and 8 channel Burr Brown DACs (PCM3168a, > > PCM1608) I could pass along. > > > > It's quite messy and I haven't worked on it in a while (4 years) but it > > also implements a 3rd order ambisonic encoder/decoder and streaming input > > via USB. The coefficients are all stored in a LUT in onboard memory to > > avoid lots of multiplication/trig. It wouldn't be too hard to modify it > to > > grab wavs from an SD card. I've been using the Nexys2 platform from > > digilent. FPGALink is a pretty cool USB library that does highspeed IO. > > PCM3168 is a tough chip to solder though... > > > > Ben > > > > > > > > On Thu, May 23, 2013 at 8:47 AM, Alexis Shaw <alexis.s...@gmail.com > <javascript:;>> > > wrote: > > > > > I am working on a system that can drive 40 or so channels based on a > zynq > > > 7020 processor. > > > > > > The zedboard which is the dev kit i am working with costs 320 for > > academics > > > and ~400 for commercial uses. > > > > > > This will then drive a series of dac boards that I am working on. They > > are > > > likely to cost about 200 each for 8 channels (ESS). > > > > > > Cheaper dac boards could be invisiged, or even direct driving digital > > class > > > D modulators. I am mainly working on the player-control hardware. > > > > > > Regards. > > > > > > > > > On Thursday, May 23, 2013, Augustine Leudar wrote: > > > > > > > Hi Alexis, > > > > yes the box would need DA converters if thats what you mean. I am > > > thinking > > > > 8 outputs to start with min 16 bit 44.1 but it would be nice to have > > > > something that could be easily customisable for more.... > > > > > > > > On 23 May 2013 14:08, Alexis Shaw <alexis.s...@gmail.com > <javascript:;><javascript:;>> > > > > wrote: > > > > > > > > > Do you need internal dacs. > > > > > > > > > > How many channels do you need implemented. > > > > > > > > > > I am working on a solution to the same problem at the moment. > > > > > > > > > > On Thursday, May 23, 2013, Marc Lavallée wrote: > > > > > > > > > > > That's an interesting idea: clustering Raspberry Pis > > > > > > with cheap 8 channels usb modules and jackd2. > > > > > > -- > > > > > > Marc > > > > > > > > > > > > "Michael Chapman" <s...@mchapman.com<javascript:;><javascript:;> > > > > > > <javascript:;>> > > > a > > > > écrit : > > > > > > > > > > > > > > Hello all, > > > > > > > > I want to start making a standalone 8 channel player (maybe > > more) > > > > - > > > > > > > > something that can be used in museums, festivals etc for > sound > > > > > > > > installations that can just be turned on and will instantly > > start > > > > > > > > looping a > > > > > > > > multichannel composition on an sd card. At the moment I am > > using > > > > > > > > rather unwieldly setups of small computers and multi channel > > > > > > > > soundcards such as RME and motu. Cables can easily be jogged > > > loose > > > > > > > > and it would be nice to have something more robust and that > > staff > > > > > > > > can easily just turn on and off. So I have looked into the > > > arduino > > > > > > > > (only 12 bit audio) and the raspberry pi but neither seem > > > > > > > > suitable . Systems already avaailable are ludicrously > expensive > > > > > > > > (1000s of euros) Has anyone got any ideas on the best way to > go > > > > > > > > about this - is there something maybe Im missing with the > > > raspberry > > > > > > > > pi/ arduino that could be customised ? Perhaps a custom made > > > > > > > > circuit board ? Ideas ? best, > > > > > > > > Gus > > > > > > > > > > > > > > If you are thinking of wider applications I would really > > encourage > > > > > > > you to go modular ... that is daisy chainable devices: > > > > > > > > > > > > > > 2+2+2+2 = 8 > > > > > > > 4+4 = 8 > > > > > > > > > > > > > > 2+2+2+2+ ... = "maybe more" > > > > > > > > > > > > > > even if it is > > > > > > > 8+ ... = "maybe more" > > > > > > > > > > > > > > Good hunting, > > > > > > > > > > > > > > Michael > > > > > > _______________________________________________ > > > > > > Sursound mailing list > > > > > > Sursound@music.vt.edu <javascript:;> <javascript:;> > <javascript:;> > > > > > > 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/20130523/46a19a71/attachment.html > > > > > > > > > > > _______________________________________________ > > > > > Sursound mailing list > > > > > Sursound@music.vt.edu <javascript:;> <javascript:;> > > > > > https://mail.music.vt.edu/mailman/listinfo/sursound > > > > > > > > > > > > > > > > > > > > > -- > > > > 07580951119 > > > > > > > > augustine.leudar.com > > > > -------------- next part -------------- > > > > An HTML attachment was scrubbed... > > > > URL: < > > > > > > > > > > https://mail.music.vt.edu/mailman/private/sursound/attachments/20130523/92db3b54/attachment.html > > > > > > > > > _______________________________________________ > > > > Sursound mailing list > > > > Sursound@music.vt.edu <javascript:;> <javascript:;> > > > > 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/20130523/f309bbc8/attachment.html > > > > > > > _______________________________________________ > > > Sursound mailing list > > > Sursound@music.vt.edu <javascript:;> > > > 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/20130523/7d26099c/attachment.html > > > > > _______________________________________________ > > Sursound mailing list > > Sursound@music.vt.edu <javascript:;> > > 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/20130523/8c1cf6f5/attachment.html > > > _______________________________________________ > Sursound mailing list > Sursound@music.vt.edu > https://mail.music.vt.edu/mailman/listinfo/sursound > -------------- next part -------------- An HTML attachment was scrubbed... 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