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Index › Programming Questions & Help › Sound,  Music Libraries › Frequency analysis on calculated data (real time!)
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Frequency analysis on calculated data (real time!) (Read 931 times)
joost
Frequency analysis on calculated data (real time!)
Nov 20th, 2009, 6:12am  
Hi there,
I'm quite new to processing, but enjoying its possibilities in combination with an arduino!
I am analyzing heart beat information in processing, frequency fluctuation and such. Now I would like to make a frequency spectrum analysis on my data. The data is calculated from the heart rate input.  I am looking for freqencies between 0,05 and 1 Hz.
I can only find spectrum analysers for audio, listening to the compu mic. Is it possible to do spectrum analysis on generated data?

Let me know if you have any idea! Thanks in advance!

Joost
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wobblybob
Re: Frequency analysis on calculated data (real time!)
Reply #1 - Nov 24th, 2009, 6:21am  
Hey joost

This article (http://www.dsprelated.com/showmessage/40428/1.php) gives a really brief insight into the issues around using a standard FFT algorithm for analysing extremely low frequency waveforms. Minim has an FFT algorithm, and there are several existing examples on plotting FFT data to show a spectrum analysis graph.
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