java - Hilbert–Huang transform: Instantaneous frequency -
I am implementing "empirical mode decomposition" in Java. The next step changes to Hilbert-Hua and I need to know how to get "instant frequency" Does anyone know how to get it?
Using the EMD method, any complex data set can be decomposed into a finite and many smaller components, which is a collection of internal mode functions (IMF). The next step is Hilbert-Huang Transform. From this I calculate the signal phase and I have to calculate the instant frequency, I search the matlab code as this link:
But I can not understand it.
Thank you
Then Hilbert Transform is applied to each IMF.
From an IMF, Hilbert Transform gives a PI / 2 phase delay signal, so that you can calculate the phase, and the time-derived step, which is proportional to the immediate frequency.
You will find an interesting tutorial and details of EMD algorithm variations on that page:
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