Underwater transient and non transient signals classification using predictive neural networks

Abstract

The project ASAROME (autonomous sailing robot for oceanographic measurements) is working on a small autonomous sailboat in order to make measurements and observations in the marine environment for long periods. In this project, perception plays an important role by giving an estimate of the speed of surface winds, the state of the sea surface and the rate of precipitation in wet weather. In this paper, the unknown signals are first encoded with different codes (ERB, MFCC, LPC, LPCC). Then the coded signals are modeled by two different methods of classification: predictive and k-nearest neighbor. The final part of the system uses local and global decision to recognize the class of the unknown signal. Experiments are conducted to compare the results obtained by different encodings. Our results show that MFCC does not represent the ideal approach for the recognition of underwater audio signals, but LPCC seems to be a better candidate.