Hi I would love to get any code, schematics or any other information you can release on this. I would some day like to try and combine low cost FPGA chips and many channels of DA chips to build simple multiple of 8 channel sound cards that could receive channels over adat, i2s or just a multichannel pcm stream.
Preferably avoiding going via expensive intermediate interfaces. I thing a RPi as a multichannel player with simple interface to a FPGA based ambisonic decoder with loadbale speaker configurations would be a very neat thing. Best Regards Bo-Erik Sandholm -----Original Message----- From: sursound-boun...@music.vt.edu [mailto:sursound-boun...@music.vt.edu] On Behalf Of Ben Bloomberg Sent: den 23 maj 2013 15:28 To: Surround Sound discussion group Subject: Re: [Sursound] Making a standalone 8ch player 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> 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:;>> > > 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:;>> > 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:;> > > > > 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/2013052 > 3/46a19a71/attachment.html > > > > > > > _______________________________________________ > > > Sursound mailing list > > > Sursound@music.vt.edu <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/2013052 > 3/92db3b54/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/2013052 > 3/f309bbc8/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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