How to generate noise spectrum curve?

[bigbigsong]

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.

[Henrik_Volkers]

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

[bigbigsong]

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.