3,156 research outputs found
Automatic Classification and Speaker Identification of African Elephant (\u3cem\u3eLoxodonta africana\u3c/em\u3e) Vocalizations
A hidden Markov model (HMM) system is presented for automatically classifying African elephant vocalizations. The development of the system is motivated by successful models from human speech analysis and recognition. Classification features include frequency-shifted Mel-frequency cepstral coefficients (MFCCs) and log energy, spectrally motivated features which are commonly used in human speech processing. Experiments, including vocalization type classification and speaker identification, are performed on vocalizations collected from captive elephants in a naturalistic environment. The system classified vocalizations with accuracies of 94.3% and 82.5% for type classification and speaker identification classification experiments, respectively. Classification accuracy, statistical significance tests on the model parameters, and qualitative analysis support the effectiveness and robustness of this approach for vocalization analysis in nonhuman species
Towards the P-wave nucleon-pion scattering amplitude in the channel
We use lattice QCD and the L\"uscher method to study elastic pion-nucleon
scattering in the isospin channel, which couples to the
resonance. Our flavor lattice setup features a pion
mass of MeV, such that the strong decay channel is close to the threshold. We present our method for
constructing the required lattice correlation functions from single- and
two-hadron interpolating fields and their projection to irreducible
representations of the relevant symmetry group of the lattice. We show
preliminary results for the energy spectra in selected moving frames and
irreducible representations, and extract the scattering phase shifts. Using a
Breit-Wigner fit, we also determine the resonance mass and the
coupling.Comment: 14 pages, 7 figures, Proceedings of the 36th Annual International
Symposium on Lattice Field Theory (Lattice 2018), 22-28 July 2018, Michigan
State University, East Lansing, Michigan US
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