RT Journal Article
T1 Bird sound spectrogram decomposition through Non-Negative Matrix Factorization for the acoustic classification of bird species
A1 Ludeña Choez, Jimmy Diestin
A1 Quispe Soncco, Raisa
A1 Gallardo Antolín, Ascensión
AB Feature extraction for Acoustic Bird Species Classification (ABSC) tasks has traditionally been based on parametric representations that were specifically developed for speech signals, such as Mel Frequency Cepstral Coefficients (MFCC). However, the discrimination capabilities of these features for ABSC could be enhanced by accounting for the vocal production mechanisms of birds, and, in particular, the spectro-temporal structure of bird sounds. In this paper, a new front-end for ABSC is proposed that incorporates this specific information through the non-negative decomposition of bird sound spectrograms. It consists of the following two different stages: short-time feature extraction and temporal feature integration. In the first stage, which aims at providing a better spectral representation of bird sounds on a frame-by-frame basis, two methods are evaluated. In the first method, cepstrallike features (NMF_CC) are extracted by using a filter bank that is automatically learned by means of the application of Non-Negative Matrix Factorization (NMF) on bird audio spectrograms. In the second method, the features are directly derived from the activation coefficients of the spectrogram decomposition as performed through NMF (H_CC). The second stage summarizes the most relevant information contained in the short-time features by computing several statistical measures over long segments. The experiments show that the use of NMF_CC and H_CC in conjunction with temporal integration significantly improves the performance of a Support Vector Machine (SVM)-based ABSC system with respect to conventional MFCC.
PB PLOS
SN 1932-6203
YR 2017
FD 2017-06-19
LK https://hdl.handle.net/10016/31501
UL https://hdl.handle.net/10016/31501
LA eng
NO This work was supported by the Spanish Government grant TEC2014-53390-P.
DS e-Archivo
RD 1 sept. 2024