Martin Homuth-Rosemann: > Am Mittwoch, 18. November 2009 schrieb Karl Hammar: > > Martin Homuth-Rosemann: ... > I asked you (and the LAU audience) to hear your/their opinion about my (maybe > silly) idea. I see this discussion in the early project status mainly as a > kind of brainstorming. Yes it is, but I has "the other" agenda to design and build a cpu card and some slow i/o cards. I don't consider your questions silly. I try to understand what your interest is and see what our common goals are. My roadmap would be something like: 1, design and build the slow i/o card (with lots of i/o) 2, dito cpu card 3, dito a 8 channel 16b/48kHz in/out card 4, dito 24b/96kHz in/out > To speed up the process of prototyping and to allow many participants I > suggested the use of "ready mades" - don't reinvent the wheel! > The atmel board ATNGW100 is easy available and not expensive, no time > consuming soldering (and hw debuging) needed - this will be a standard > platform for colaboration. I have that card, we can use it as a common platform. > The same goes for the ADC, if we use available units with an (open) standard > communication protocol like AES-3, ADAT or MADI we can concentrate on the > difficult and more exciting part - finding new solutions / algorithms for syncing > different sources, internet transfer, ... Ok, that is good enought, a pity that I don't have any audio equipment with thoose interfaces. ... > > > We need the codec, some kind of amplification, a clean power supply etc. > > > to get a good S/N ratio - and we need it for a lot of channels. > > Do you have a spec. which you'd like to discuss ? > > E.g. how many channels are you regulary using, what s/n ratio is a > > minimal requirement for you ? > We (no pluralis maiestatis, I summed my impression from some postings of the > LAU audience) need more than two channels, more than 16 bit and more than > 100dB S/N at minimal 48 kHz, preferably 96 kHz. Ok, shall we set the goal to >= 8ch in/out at 24b 96kHz 100dB S/N, with some inbetween easier targets ? Is it useful to have 24b/96kHz on output, or would it be sufficient to have 16bit/48kHz ? ... > > If this project shall implement any of theese interfaces it might > > then be the ADAT or MADI, since I see no reason to implement the > > smaller interfaces. > But AES-3 (or AES-42 for digital microphone) is a standard for digital audio > connection. But I thought that the goal was to have more than mere 2-4 channels ? > > But if we successfully implement adat or madi, we are still missing > > the adat/madi part on the pc. So we still have a problem... > No, our "LAU-interface" is this part on the pc. I don't understand you. Can you give an example? *** I see two different things here: A, a hardware project B, finding new solutions/algorithms for syncing different sources... *** My main interest is project A. For project B, can't we simply use ordinary pc's, one master and a few slaves, or am I missing something ? Initially I had the idéa of a very small card with a cpu and one adc/preamp, a mic-card, but that idéa didn't receive much interest. A few of thoose hypothetical mic-card plus a master pc could be a platform for testing syncing problems/solutions and distributed recording. I'd consider that an interesting problem. Regards, /Karl ----------------------------------------------------------------------- Karl Hammar Aspö Data karl@xxxxxxxxxxx Lilla Aspö 148 Networks S-742 94 Östhammar +46 173 140 57 Computers Sweden +46 70 511 97 84 Consulting -----------------------------------------------------------------------
_______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
