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Old 10-13-2017, 03:59 AM
F.Verbeek F.Verbeek is offline
Join Date: Oct 2017
Posts: 30
Default Re: Horizontal time slice of spectrogram

Originally Posted by Michael Pitzrick View Post
Hi Femme,

I think there's a good chance we will include Cepstrum analysis in Raven 2.0.

That would be great. When can we expect it?

Coming back to my previous remarks, there are two ways of doing this:
If you take the contents of the spectrograph as a starting point,

Calculate the inverse FFT over each of the columns and use the same display procedure as for the spectrograph, quefrency vs time (Cepstrograph?). What you will see is how the harmonics develop as a function of time.

Calculate the (inverse) FFT over each of the rows, and display it frequency vs. quefrency, what you will see is the pulsation (slupation?) rate in each frequency band. E.g. think of a referee's whistle. You will probably see a field of dots. But the most intense is in vertical direction as the tone it sounds as, and in horizontal direction at the time the little ball inside the flute takes to make a revolution.
Interesting for you:It could be a great way of characterizing birdsongs, whistle tone and rate at which he moves his beak while producing it.

.. Femme
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