: Received: 29 November 2017 / Approved: 1 December 2017 / Online: 1 December 2017 (06:37:39 CET)
: Received: 15 December 2017 / Approved: 17 December 2017 / Online: 17 December 2017 (08:58:58 CET)
: Received: 8 January 2018 / Approved: 8 January 2018 / Online: 8 January 2018 (18:29:11 CET)
Hubert, P.; Padovese, L.; Stern, J.M. A Sequential Algorithm for Signal Segmentation. Entropy2018, 20, 55.
Hubert, P.; Padovese, L.; Stern, J.M. A Sequential Algorithm for Signal Segmentation. Entropy 2018, 20, 55.
The problem of event detection in general noisy signals arises in many applications; usually, either a functional form for the event is available, or a previous annotated sample with instances of the event that can be used to train a classification algorithm. There are situations, however, where neither functional forms nor annotated samples are available; then it is necessary to apply other strategies to separate and characterize events. In this work, we analyze an acoustic signal obtained from a hydrophone, and are interested in separating sections, or segments, of the signal which are likely to contain significative events. For that, we apply a sequential algorithm with the only assumption that an event alters the average power of the signal. The algorithm is entirely based on bayesian methods, and shows a very promising performance in detecting either short or long events.
signal processing; bayesian methods; subaquatic audio; hydrophone; unsupervised learning
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