time scale spectrogram custom

Hello

I have a view of the spectrogram (graphic of intensities) that I use as a cascade of Amplitude vs vs frequency time plot. This display receives real time incoming data from hardware and DSP performance (using toolkit spectral measurements) to return a single image FFT or update the display. My spectrogram is configured to have 100 updates on the screen at a time, and I have a buffer behind the scenes containing a total of 5000 TFF framework implemented to date. I paint mainly a scrolling display cascading with the ability to go back and look at the data.

The nature of current DSP to run on incoming data direct (too high a sampling rate for entirely real-time processing), on a windows machine and the only packages entering data when DSP is ready for more - my time scale updates are not accurate. I use the latest t0 of a packet entering data as the spectrogram scale is offset and then set the multiplier is regardless of the value of update rate (controlled operator). The update just control the number of FFT frames rates are averaged before a single update is published on the display/buffer.

So after a long explanation, my question is: would it be possible to have a time scale customized for my spectrogram so that the time be accurate throughout the history buffer? Currently, if the update rate is changed which will not change the time scale multiplier and all the old data on the display will have incorrect time values.

I guess I'm looking for a way to contain a table of 5000 timestamps with my 5000 updates and publish the most recent 100 timestamps/updates the display update rate. I saw the scale Y-> property [] marker values. It would be something I could put 100 timestamps on my screen?

Thank you

Tim Sileo

Hi Tim,.

I have attached a sample VI showing the features of the property of an axis marker values.  If you have data aligned with the correct time stamp in your tables, you should be able to choose what timestamps to display with this property node.  I hope this helps!

Tags: NI Software

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