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Collecte automatique des données --- Automatic data collection systems --- Ingénierie --- Engineering --- Mesure --- Measuring instruments --- Appareils et matériel --- Instruments --- Capteurs. --- Traitement du signal --- Données --- Brouillage électromagnétique. --- Techniques numériques. --- Transmission. --- Capteurs --- Brouillage électromagnétique --- Techniques numériques --- Transmission --- Données --- Brouillage électromagnétique --- Techniques numériques --- Ingénierie - Mesure - Appareils et matériel --- Mesure - Instruments --- Detectors --- Signal processing --- Data transmission systems --- Electromagnetic interference --- Digital techniques

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Single-channel hands-free teleconferencing systems are becoming popular. In order to enhance the communication quality of these systems, more and more stereophonic sound devices with two loudspeakers and two microphones are deployed. Because of the coupling between loudspeakers and microphones, there may be strong echoes, which make real-time communication very difficult. The best way we know to cancel these echoes is via a stereo acoustic echo canceller (SAEC), which can be modelled as a two-input/two-output system with real random variables. In this work, the authors recast this problem into a single-input/single-output system with complex random variables thanks to the widely linear model. From this new convenient formulation, they re-derive the most important aspects of a SAEC, including identification of the echo paths with adaptive filters, double-talk detection, and suppression.

Ambient intelligence. --- Automatic data collection systems -- Standards. --- Echo cancellation. --- Stereophony. --- Echo suppression (Telecommunication) --- Electrical & Computer Engineering --- Engineering & Applied Sciences --- Electrical Engineering --- Applied Physics --- Telecommunications --- Acoustical engineering. --- Acoustic engineering --- Sonic engineering --- Sonics --- Sound engineering --- Sound-waves --- Echo cancellation (Telecommunication) --- Echo control (Telecommunication) --- Suppression, Echo (Telecommunication) --- Telecommunication --- Industrial applications --- Echo suppression --- Engineering. --- User interfaces (Computer systems). --- Fourier analysis. --- Signal, Image and Speech Processing. --- User Interfaces and Human Computer Interaction. --- Fourier Analysis. --- Engineering --- Radio noise --- Signal processing --- Telecommunication systems --- Computer science. --- Analysis, Fourier --- Mathematical analysis --- Informatics --- Science --- Signal processing. --- Image processing. --- Speech processing systems. --- Processing, Signal --- Information measurement --- Signal theory (Telecommunication) --- Interfaces, User (Computer systems) --- Human-machine systems --- Human-computer interaction --- Computational linguistics --- Electronic systems --- Information theory --- Modulation theory --- Oral communication --- Speech --- Singing voice synthesizers --- Pictorial data processing --- Picture processing --- Processing, Image --- Imaging systems --- Optical data processing