sound data acquisition

[labmaster]

Frankly, I am a "very" beginner in sound measurement with LabView 8.2.&nbsp;My program have to measure the pressure (already done) and stethoscope sound(similar to heart beat) for blood pressure measurement.I found the sampling rate could be less than 1 kHz for pressure using USB DAQ.But, I have no idea for sound measurement except that..&nbsp; (I have to identify the start / end points of sound rather than detail waveform.)&nbsp;First, I have to prepare some sensors for stethoscope sound.Generally, what kind of "micro" sensors for sound measurement?(For example about application, <a href="http://www.ymec.com/hp/signal2/heart1.htm" target="_blank">http://www.ymec.com/hp/signal2/heart1.htm</a> Is there any selection guide for sound measurement?&nbsp;Second, I am worring about data aquisition.As I mentioned earlier, I have to measure two signals simultaneously (time-synchronized).To my knowledge, the sound should be faster than 10 kHz.Can I use a (good) specification sound card for my purpose or general NI-DAQ USB card?&nbsp;Third, Is any sound card support the LV programming? or any other toolbox such as NI-RealTime?(I know only there is an add-on toolkit of sound data analysis *not* aquisition&nbsp;from NI.)&nbsp;Thanks.
*)Any complex analysis&nbsp;can be performed after the measurements.???? 08-12-2008 03:26 AM? labmaster? ?? ?????

[Corby_B]

Hello labmaster,&nbsp;Thanks for your post!&nbsp;I see that you are wanting to do some sound measurements with NI hardware. I would like to point you to the following link that talks about simultaneous sound acquisitions. This all lies in the PXI, PCI and USB form factor.&nbsp;&nbsp;<a href="http://www.ni.com/soundandvibration/" target="_blank">Sound and Vibration Measurement and Analysis. </a> &nbsp;&nbsp;Some of the USB devices you can use in a CRio or CDaq chassis however this usually limits you to 4 channels.&nbsp; So of course you can use the sound and vibration toolkit to analyze all your data and then using the DAQmx driver to acquire the sound data. I have to be honest I don't know to much about trying to monitor using a stethoscope but take a look at the link below for some information from engineers that have done analysis like this before.&nbsp;&nbsp;<a href="http://zone.ni.com/devzone/cda/epd/p/id/5832" target="_blank">Using LabVIEW for Heart Rate Variability Analysis. </a> &nbsp;Let us know if any of this information helps you on your way with your applications and please post back if you have any questions!&nbsp;Cheers!&nbsp;Corby_Bhttp://www.ni.com/support&nbsp;&nbsp;