Instantaneous Frequency
5 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hello
I am estimating the Instantaneous Frequency of my signal using the following code.
h=hilbert(acc);
unrolled_phase = unwrap(angle(h));
inst_freq = ((diff(unrolled_phase))'./diff(T))/(2*pi);
I get both positive and negative frequencies (very few) also some spikes. How to avoid negative frequency and unrealistic. frequencies?
0 commentaires
Réponse acceptée
Daniel Shub
le 5 Août 2011
Your problems are coming from the unwrapping of the phase. Your estimate of the instantaneous frequency can only be negative if diff(unrolled_phase) is negative. Just add 2pi to those points (and all the values after).
0 commentaires
Plus de réponses (0)
Voir également
Catégories
En savoir plus sur AI for Signals dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!