STFT (spectrogram)

[borovsk]

Hello all!

 How can I convert frequency axis to period  axis (intensity graph), when STFT-data put into on intensity graph?

[VirtualWorld]

How about connecting period to intensity graph 2D array and single click on frequency label to rename it Period ?

Will that work ?

Kudos are Welcome 

[borovsk]

"How about connecting period to intensity graph 2D array and single click on frequency label to rename it Period " -it will not work.. I think.... ->

-> 2D array STFT-data -it's amplitude(magnitude) array, right? there delta F (step) is linear... (0,01 0,02)

if convert Frequency to Period, then delta Period (step) non-linear, because delaPeriod=1/delta(100 50) F(step increases nonlinear/irregularly).

How can I do it? averybody, help me...

[borovsk]

How to compute 2D array-amplitudes for periods? rather than frequencies...

[borovsk]

what is needed, example:  

How Can I do it??? anybody, help me  please.

[DFGray]

To convert from frequency to period, you will need to resample your data along the Y axis.  LabVIEW includes a number of resampling algorithms, one of which should work for you.  Process your data a vertical line at a time using one of them and you should be good to go.  Given the fixed nature of the resampling, you should be able to make this quite efficient.

[borovsk]

->this does not work... no ideas...

1. invers array, 

2. setting Y scale.->

[A_Donfigulation_Error_Has]

Hi borvsk,

How is the bottom graph not what you wanted? That looks like it is giving you the period of the frequency graph above. Please explain in more detail.

Jason L.

[borovsk]

100Hz-0,01sec - good. 200Hz- 0,008sec -bad, 400Hz - 0,0025sec-good 300Hz-0,005sec- bad

100Hz=0,01sec, 200Hz=0,005sec, 400Hz=0,0025sec, 300Hz=0,00(3)sec.

[A_Donfigulation_Error_Has]

Hi borovsk

I see what you mean in that it is incorrect. Do you mind posting a snippet of your block diagram? I think it would be beneficial for us if we can see that portion.

Jason L