# How to measure any disturbance in a signal that is exceeding a threshold?

1 vue (au cours des 30 derniers jours)
Susan le 19 Jan 2023
Commenté : Walter Roberson le 24 Jan 2023
Hi,
Assuming having a noisy signal as attached, I'm interested in measuring any disturbance that exceeds a threshold, i.e., 0.12. How can I do that?
##### 2 commentairesAfficher AucuneMasquer Aucune
Walter Roberson le 19 Jan 2023
Is that 0.12 an absolute value, or is it a relative value? If it is relative, what is it relative to?
Susan le 20 Jan 2023
@Walter Roberson Thanks for your response.The 0.12 is an absolute of the disturbance peak-to-peak value.

Connectez-vous pour commenter.

### Réponse acceptée

Walter Roberson le 19 Jan 2023
wherebig = find(Yvf > 0.12);
##### 4 commentairesAfficher 2 commentaires plus anciensMasquer 2 commentaires plus anciens
Walter Roberson le 24 Jan 2023
[~,LOCS] = findpeaks(Yvf, 'MinPeakHeight', 0.12);
Note that the find() done earlier would locate all of the entries in Yvf > 0.12, whereas findpeaks() with this option would look for locally high points
Walter Roberson le 24 Jan 2023
Which one you would use (or which options for findpeaks()) would depend on whether you need to know the immediate start of the disturbance crossing a threshold, or if you want instead to know where the peak of the disturbance was.

Connectez-vous pour commenter.

### Catégories

En savoir plus sur Descriptive Statistics 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!

Translated by