128 research outputs found
The Multi-Pitch Estimation Problem: Some New Solutions
n this paper, we formulate the multi-pitch estimation problem and propose a number of methods to estimate the set of fundamental frequencies. The methods, which are based on nonlinear least-squares, multiple signal classification (MUSIC) and the Capon principles, have in common the fact that the multiple fundamental frequencies are estimated by means of a one-dimensional search. The statistical properties of the methods are evaluated via Monte Carlo simulation
Model-based Speech Enhancement for Intelligibility Improvement in Binaural Hearing Aids
Speech intelligibility is often severely degraded among hearing impaired
individuals in situations such as the cocktail party scenario. The performance
of the current hearing aid technology has been observed to be limited in these
scenarios. In this paper, we propose a binaural speech enhancement framework
that takes into consideration the speech production model. The enhancement
framework proposed here is based on the Kalman filter that allows us to take
the speech production dynamics into account during the enhancement process. The
usage of a Kalman filter requires the estimation of clean speech and noise
short term predictor (STP) parameters, and the clean speech pitch parameters.
In this work, a binaural codebook-based method is proposed for estimating the
STP parameters, and a directional pitch estimator based on the harmonic model
and maximum likelihood principle is used to estimate the pitch parameters. The
proposed method for estimating the STP and pitch parameters jointly uses the
information from left and right ears, leading to a more robust estimation of
the filter parameters. Objective measures such as PESQ and STOI have been used
to evaluate the enhancement framework in different acoustic scenarios
representative of the cocktail party scenario. We have also conducted
subjective listening tests on a set of nine normal hearing subjects, to
evaluate the performance in terms of intelligibility and quality improvement.
The listening tests show that the proposed algorithm, even with access to only
a single channel noisy observation, significantly improves the overall speech
quality, and the speech intelligibility by up to 15%.Comment: after revisio
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Evaluation Distance Measures Between Gaussian Mixture Models of MFCCs
In music similarity and in the related task of genre classification, a distance measure between Gaussian mixture models is frequently needed. We present a comparison of the Kullback-Leibler distance, the earth movers distance and the normalized L2 distance for this application. Although the normalized L2 distance was slightly inferior to the Kullback-Leibler distance with respect to classification performance, it has the advantage of obeying the triangle inequality, which allows for efficient searching
Asteroseismology of the Hyades red giant and planet host epsilon Tauri
Asteroseismic analysis of solar-like stars allows us to determine physical
parameters such as stellar mass, with a higher precision compared to most other
methods. Even in a well-studied cluster such as the Hyades, the masses of the
red giant stars are not well known, and previous mass estimates are based on
model calculations (isochrones). The four known red giants in the Hyades are
assumed to be clump (core-helium-burning) stars based on their positions in
colour-magnitude diagrams, however asteroseismology offers an opportunity to
test this assumption. Using asteroseismic techniques combined with other
methods, we aim to derive physical parameters and the evolutionary stage for
the planet hosting star epsilon Tau, which is one of the four red giants
located in the Hyades. We analysed time-series data from both ground and space
to perform the asteroseismic analysis. By combining high signal-to-noise (S/N)
radial-velocity data from the ground-based SONG network with continuous
space-based data from the revised Kepler mission K2, we derive and characterize
27 individual oscillation modes for epsilon Tau, along with global oscillation
parameters such as the large frequency separation and the ratio between the
amplitude of the oscillations measured in radial velocity and intensity as a
function of frequency. The latter has been measured previously for only two
stars, the Sun and Procyon. Combining the seismic analysis with interferometric
and spectroscopic measurements, we derive physical parameters for epsilon Tau,
and discuss its evolutionary status.Comment: 13 pages, 13 figures, 4 tables, accepted for publication in Astronomy
& Astrophysic
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