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
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Karl Hammar Aspö Data karl(a)aspodata.se
Lilla Aspö 148 Networks
S-742 94 Östhammar +46 173 140 57 Computers
Sweden +46 70 511 97 84 Consulting
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