time-frequency sampling info spectrogram

[TomTomTomTomTom]

Hello!

I work with audio signal from WAV file. I want to calculate spectrogram. I know that I can use TFA STFT Spectrogram VI + TFA Configure Spectrogram Indicator VI and plot it with intensity graph. I´m able to correctly set time on X-axis, but I donť know how to set frequency on Y-axis.
I have read help and I know that problem is with time-frequency input info. I don´t fully understand the meaning of the text. What they want on that input?

I have LabVIEW 2013.

Many thanks!

[TomTomTomTomTom]

No one? 😕

[GerdW]

Hi 5× Tom,

without that special toolkit installed I would start like this:

What exactly is your problem?

[TomTomTomTomTom]

Hello!

My problem is that I´m able to calculate STFT spectogram with (TFA STFT spectrogram.vi), but I´m not able to correctly set frequency information in my spectogram ( Y-axis). It doesn´t show real values of frequencis in my signal. X-axis with time information is OK. (Check picture)

You mentioned 'Power spectrum.vi', but it calculates only power spectrum. I need intensity graph (color map - like in picture).

But if there is an easier way than with TFA STFT spectrogram.vi please tell me.

[GerdW · Accepted solution]

Hi 5×Tom,

you could change the axis scaling using property nodes. The intensity graph offers the same properties as any other graph regarding axis formatting…

[TomTomTomTomTom]

Yeah, thats true! I have understood it in bad way. Anyway, I have found 'Spectral Map.vi and Colormap'. It´s awesome! I will use this two blocks 🙂 Thanks for your time!