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These last years, GSM-R (global system for mobile communication - railway) was developed and widely implemented in Europe as a unique standard to exchange voice communication, signaling information and control data between trains and ground control centers. To effectively carry out this mission, it is vital to ensure the resilience of the GSM-R radio link against electromagnetic interferences coming...
This paper explores an approach trying to recognize the presence of electromagnetic attacks on an equipment. Wireless communications are widely used in railway traffic management systems. Such systems are probably susceptible to be disturbed by malicious actions involving jammers. The general objective of this work is to develop a specific method enabling to detect and to recognize these types of...
In this paper, we present a supervised method for speaker localisation in an echoic environment using a microphone array. An audio source is located among a set of areas centered on each microphone. Each area is characterized by a multi-dimensional Gaussian Mixture of the propagation channel between the source and several pairs of microphones. The distance between the sensors has been chosen in order...
We present a new approach to the voice activity detection (VAD) problem for speech signals embedded in non-stationary noise. The method is based on automatic lipreading: the objective is to detect voice activity or non-activity by exploiting the coherence between the speech acoustic signal and the speaker's lip movements. From a comprehensive analysis of lip shape parameters during speech and non-speech...
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