RE: [linux-audio-user] High sample rate cards

/Friday, August 25, 2006, 9:27:57 PM, you wrote:
/B> I'm looking to do some high sample rate stuff - 500kHz or more - for
/B> modulated ultrasonics experiments. Anyone know of a card that will do
this ?
/B> All I've seen is data aquisition cards that cost silly money, and the
sound
/B> cards I've found seem to top out at 192kHz. Any pointers appreciated.

/Forget using sound cards for this. The main reason to do higher
/samplerates is to get a really flat filter response of the
/anti-aliasing filters in the audible range.
/So these filters would be your main problem if you want to go up in
/frequency.

/My guess is that you actually need a data-acquisition card for it.

/Then you'll need a proper amplifier and transducer for this...

/and then the question is how far these waves will actually go through
/air, as the higher the frequency the more the wave gets damped in the
/air (depending on humidity and temperature).

/From what angle are you doing this? What do you try to achieve?

/You may want to look at something called audio-spotlights. If I am not
/mistaken with that they do something with high frequency sound waves,
/where the audible sound is created by interference between two beams
/of those...

It's a psychoacoustics exercise - trying to generate a new musical
experience by combining 'normal' audio with ultrasonics - in a live setting.
All the D/A cards I've looked at seem to go well into the MHz range (though
I'm confused by the units they use 10MS/s=10Mhz ?), and cost hundereds of
pounds. I'm looking for somthing in the middle. Any info on amps/sounders
also apreciated, and of course I'd like to use it with linux audio software
so an ALSA driver for the device would be nice.

Bruce.
Received on Sat Aug 26 20:15:02 2006