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| Roman Rumian... |
 Posted: Mon Oct 26, 2009 9:54 pm |
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| HardySpicer... |
| Posted: Mon Oct 26, 2009 10:13 pm |
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On Oct 27, 6:54 am, Roman Rumian <rumian.wytn... at (no spam) agh.edu.pl> wrote:
Quote: Hello,
it is hard to find a 16 or more channel PC card or USB device for
microphone array recording.
I know about NI or Brüel & Kjær solutions, but they are expensive ...http://www.bksv.com/Products/PULSEAnalyzerPlatform/PULSE%20Overview.aspxhttp://www.ni.com/pdf/products/us/cat_sv923x.pdf
Could you help me ?
Regards
Roman Rumian
Try National Instruments. 16 is possible though with your sample rate
(22kHz/channel?) not too cheap. If you went 8kHz per channel
multiplexed - not too bad.
USB - no problem though you may well need anti-aliasing filters and
pre-amps etc.
Hardy |
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| Richard Dobson... |
| Posted: Mon Oct 26, 2009 10:42 pm |
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Roman Rumian wrote:
Unlikely to be any really cheap solutions above 8 channels (e.g. one
ADATs-worth); and of course you would need to nail down your
requirements more, e.g. sample rates, word size.
The products from RME are a good place to start; they cover both cards
and Firewire/USB, and beyond Windows and OS X they also have good Linux
support. The cards use AES, MADI etc; and you will therefore need
separate analog converters too; which is where much of the cost will lie.
http://www.rme-audio.de
Many soundcards support external clocking, so one option that ~might~ be
cost-effective is to use mid-price devices that can be clocked
together; but I can't think of examples offhand. For recording a mic
array you will of course need to guarantee sample-accurate timing across
all channels. So you can only use multiple "cheap" 8 channel cards if
you can slave them together to an external clock.
Noet that many devices advertised as, san 32channel cards, arrive at
that figure by adding up all the different types of i/.eo - analog,
ADAT, AES, etc. So the Firewire/USM devices from RME may offer up to 56
channels, but perhaps only 10 analogue inputs.
Basically, you will have to decide what i/o bus format to go for -
ADAT(s), multiple AES/SPDIF, MADI, and so on.
This is probably a good question to send to the sursound mailing list;
it is well-subscribed by people involved, one way and another, with lots
of audio channels.
Richard Dobson |
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