07-26-2017 02:48 AM - edited 07-26-2017 02:57 AM
I use computer sound card and acquire sound (noise) from a microphone. I try to do FFT transformation and would like to display the noise spectrum like the picture shown below. But I don't know how to do the FFT.
07-26-2017 04:55 AM
It's not only the FFT 😉
These vis can be found in the signal processing menue.. (Seems that you need to make some training in LV first)
Do you have the Sound&Vibration toolkit?
It will do all that fancy A-Filtering.... and scaling....
For the scaling:
And you migth need a calibrated mic and ... a soundcard ... ..mmh
So you migth also need a pistophone to do the scaling rigth
07-26-2017 09:09 PM
Dear Henrik_Volkers, thanks for your reply.
I have Sound& Vibration Toolkit. But how to do the FFT, use which vi?
Here's what i did. Get CH1& CH2 raw waveform data, scale axi Y voltage into Pa, caculate Seq sound level. Do FFT(use RMS averaging), get the result and transfer axi Y voltage into dBSPL and display it as XY Graphy.
But don't get the result i want.