Time Frequency Analysis

[Neuropotential]

Is there any way to perform time-frequency analysis(spectrogram ) in DIAdem? Ideally, I got like to play the waveform in one section of the VIEWER and other section of the VIEWER would have the spectrogram of the data within the band cursor.

Does anyone think this is possible in DIAdem?

[Brad_Turpin]

Hi Neuropotential,

What you're asking for is possible, but it's not an out of the box feature.  We have a posted example application for doing joint time frequency analysis in REPORT at

http://zone.ni.com/devzone/cda/tut/p/id/3549

You could set the same sort of thing up in VIEW with the new 3D Contour Area available in VIEW in DIAdem 11.1.  I'm curious how you'd like the interactive part to work in VIEW and also how large your data sets are.

Brad Turping

DIAdem Product Support Engineer
National Instruments

[Neuropotential]

Thanks Brad for the reply. I will look at the link you provided and get back to you. 

A typical dataset would be around 15 minutes of single channel recording at 40 hz,so thats about 36000 points. In the VIEW, I can make a Moving Window using the band cursor of about 30 sec. Then when I press the play button in VIEW, I should be able to get the moving window automatically scroll across the 15 min data and simultaneously, the spectrogram should update itself. 

Let me know if you have any more questions. 

[Neuropotential]

I saw the example you gave me. I am not sure how will I modify this to suit my needs.

[Brad_Turpin]

Hi Neuropotential,

I'm willing to help you adapt the REPORT example so that you get a Joint-Time-Frequency environment in VIEW, but I'm not going to do anything until I understand clearly what you want.  Feel free to email me directly at brad.turpin@ni.com with a description of what you want to have happen in VIEW.

Brad Turpin

DIAdem Product Support Engineer
National Instruments

[Neuropotential]

Hey Brad thanks. For now, i have found the work around. I will contact you in case my work around fails in future.