What type is output of WVD command(LabVIEW)?

[mikimiki]

I want WVD's output of Y-axis to truly frequency,
but I can't input sampling nomber to WVD command.

[Cyril]

I'm not sure I totally understand your question and will be assuming that you're talking about the WVD Spectrogram.vi that can be found in the Functions palette>>Analyze>>Signal Processing>>Frequency domain.

The inputs for that VI are the Time domain data,X which is a 1D array and the time increment.
Time increment is defined as follows: by default it has a Value of 1 thus 1/(Sampling Frequency of the time domain data) gives you time interval in seconds. By reducing or increasing this increment, you either increase or reduce the resolution of your spectrogram.
As a result, if you want your spectrogram to have the same X axis on your intensity graph as your time domain waveform you need to set your time increment to 1.

Regards,

Cyril Bouton
Application E
ngineer
National Instruments

[mikimiki]

Thank you for good advice.Your answer was just fit
with my question. So I see about WVD Spectrogram.vi
output. And I have a new question.
It's "How to get correct time&frequency graph from
wave file?". I want to know how to multiply X axis
by 1/sampling frequency. I want to know WVD's output
format.
I'm sorry for clumsy English.