Vocal effort changes induce various modifications to acoustic characteristics of speech. In this paper we investigate the impact of raised vocal effort on the speech spectrum. In particular, we look at different spectral parameters and compare the changes. The parameters we take into account are spectral tilt, spectral center of gravity, energy ratio and spectral moments. We carry out tests on ...

We observe that a class of conditional probability measures for unbounded spin systems with convex interactions satisses Poincar e and logarithmic Sobolev inequalities. For the corresponding conservative dynamics in a box of linear size L we show that the inverse of the spectral gap and the logarithmic Sobolev constant scale as L 2 in any dimension. 2000 MSC: 60K35

8.

We examine the relationship of a graph G and its random subgraphs which are defined by independently choosing each edge with probability p. Suppose that G has a spectral gap λ (in terms of its normalized Laplacian) and minimum degree dmin. Then we can show that a random subgraph of G on n vertices with edge-selection probability p almost surely has as its spectral gap λ−O (√ logn pdmin + (logn)...