Bo-Erik, I had this project for years! I got a "classic" motherboard from Intel, with 4 PCI slots. I hope to get 32 channels.
-- Marc Mon, 7 Apr 2014 07:38:20 +0000, Bo-Erik Sandholm <[email protected]> wrote : > Do we remember this? > http://alsa.opensrc.org/TwoCardsAsOne > http://quicktoots.linux-audio.com/toots/el-cheapo/ HW modification , > sharing one x-tal > > Either just add 2 or 3 PCI or PCI-E soundcards to an old PC. > > OR building a "low cost pc" with 16 ( or 24 ) channels of sound > outputs for around 150 Euro? Mother board have possibility to expand > to 3 pci-e soundcards. Can be built as a minitower - > I belive the CPU power is good enough for decoding - do I need more > than 2 GB Memory for building this as a first degree decoder? > > http://www.asus.com/se/Motherboards/AM1MA/ 3 PCI-E 299 SEK > http://wimages.vr-zone.net/2014/03/am1.jpg AMD e2-3850 350 SEK > Memory DDR3 2 > GB ? > 300 SEK Disc or USB boot - Power and Box - recycling > > http://www.aliexpress.com/snapshot/6052508040.html 2 PCIE soundcards > 31 USD / cards == 420 SEK 2) Based on VIA VT1723 Envy24DT > multi-channel audio controller, Sampling rate up to 24 bits and 48KHz > for both playing back and recording - 8 channels > > > Would the CPU power and memory 2GB be enough for > > A6-5350 A4-5150 E2-3850 > E1-2650 Cores / Threads 4 / 4 4 / > 4 4 / 4 2 / 2 CPU Frequency > 2050 1600 1300 1450 2000 1400 > GPU HD 8400 HD 8400 HD 8280 HD > 8240 GPU SPs 128 128 > 128 128 GPU Frequency 600 > 600 450 400 L2 Cache > 2MB 2MB 2MB 1MB > TDP 25 W 25 W 25 > W 25 W Platform AM1 > AM1 AM1 AM1 > > > > -----Original Message----- > From: Sursound [mailto:[email protected]] On Behalf Of > Marc Lavallée Sent: den 6 april 2014 15:37 > To: [email protected] > Subject: Re: [Sursound] Inexpensive USB multichannel sound card > > Sun, 6 Apr 2014 06:23:37 +0100, > Dave Malham <[email protected]> wrote : > > > Lets not worry too much about silicon - it's ridiculously cheap > > these days, so long as you are not going for the top end. If we are > > to use cheap, ready built, USB units and not our own purpose built > > kit (and that's not unthinkable, this is the age of the maker, > > right?) I think it all hinges on two things, synchronisation and > > bit rate. For 24 bits and 48 Khz, which is, I guess, about the > > lowest we'd all be happy with, that's 1152 kilobits per second, > > which means for USB 2, a practical limit of 8/10 channels per plug, > > all things being equal. This is why there are 7.1 units out there. > > Hi Dave. > > The previously mentioned cheap USB sound modules are limited to 16 > bits and 48Khz. When resampling 24bit sources with dithering, 16 bits > is enough for domestic use. At 48Khz, that's 768Kbps per channel, and > at 44.1Khz that's 705.6Kbs. So the required USB bus speed for 8 > channels is 6144Kbps or 5645Kbps (maybe more with some protocol > overhead). > > These modules work with USB 1.1, not USB 2. The USB 1.1 standard have > two speeds: low at 1.5Mbps, and full at 12Mbps. So, theoretically, a > single USB 1.1 bus at full-speed can handle two 7.1 sound modules at > 16bit/44.1Khz. I don't know how a USB 2 hub deal with several USB 1.1 > devices. > > I yet have to test two modules with a RPI. > -- > Marc > _______________________________________________ > 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 > _______________________________________________ Sursound mailing list [email protected] https://mail.music.vt.edu/mailman/listinfo/sursound
