02-18-2008 12:06 PM
02-19-2008 03:44 PM
02-20-2008 11:01 AM
07-08-2009 04:02 PM
SL in T wrote:
" Have Sound and Vibration Toolkit Version 3.1.
Once I replaced the standard FFT with the one from SVT I now get
correct/matching dB levels for both FFT and Octive Analysis. >>
Problem solved!"
Hi I have also had some problems making acoustic measurements with a microphone and I do not have the SVT. Are you saying that there is a problem with the FFT in the standard signal processing kits that the SVT fixes? I am trying to follow an ASTM for a two microphone method of testing acoustic absorption, but I have hit a wall. I seems that all the calculations are correct, leading me to think that there is a problem with a labview VI.
Does anyone know if there is a problem with the standard FFT VI in labview?
Thanks in advance
09-14-2018 04:10 PM
I have a wav file constisting of a recorded calibration signal, the signal is a recorded tone with a sound pressure level of 93.9 dB (~0.99 pascal) at 1000 Hz. The equipment I used to record the file "calibration.wav" has a sensitivity of around 53.49 mV/pascal. After performing 1/3 octave analyses on that wav file it should show 94 db for 1000 hz but it is below that. Is there any way to fix it? I'am also using SVT and tried to scale the signal EU units, didn't help. Any suggestions?
@jchrisj