This paper presents a novel audio discrimination algorithm using spatial features in time-frequency (TF) space. Three types of audio signals – speech, music without vocal and music with background vocal are taken into consideration for classification. The audio segment is transformed into TF domain yielding the spatial illustration of energy. Nonnegative matrix factorization (NMF) is applied to...

By inducing controlled changes in the electrophysiologic properties of the whole heart, numerous studies have analysed the onset and maintenance mechanisms of ventricular arrhythmias. In this contribution a new method that cause local heterogeneities in the cardiac tissue is explained. A specific device, based on the Peltier effect, has been developed to quantify, in an experimental model (Lang...

Three studies of dominance explore the frequency concept of disposition, which entails categories of acts that are topographically dissimilar but nonetheless considered to be manifestations of a common disposition. In the first study, 100 difierent acts presumably belonging to the category of dominance were generated through a nomination procedure. In the second study, expert and student panels...

Frequency domain analysis of linear time-invariant (LTI) systems in feedback with static nonlinearities is a classical and fruitful topic of nonlinear systems theory. We generalize this approach beyond equilibrium stability analysis with the aim of characterizing feedback systems whose asymptotic behavior is low dimensional. We illustrate the theory with a generalization of the circle criterion...

Obstructive Sleep Apnea is a frequent disorder with detrimental health, performance and safety effects. The diagnosis of the disorder is cumbersome and expensive. New methods for screening and diagnosis are needed. The method we describe in this work is based on detection of four main features of respiratory signal. The automatic signal classification starts by extracting signal features from a...

With fast development of power electronic technology, the system is undergoing a great revolution to power-electronic-based one and it poses challenge dominant device identification for stability analysis. As an alternative approach, this paper proposes frequency-domain participation factor method based on open-loop transfer function matrix <italic xmlns:mml="http://www.w3.org/1998/Math/MathML"...

INTRODUCTION AND OBJECTIVES The analysis of frequency variability during ventricular fibrillation has yielded inconsistent results. We used an experimental model of ventricular fibrillation, with a short timescale, to analyze variations in frequency and their associated spatial distribution. METHODS Epicardial recordings of ventricular fibrillation were made in 10 perfused isolated rabbit hea...