Home HomeEberhard Hansler, Darmstadt University of Technology (Germany)
This paper emphasizes the efforts which are necessary to move from algorithms for adaptive compensation of acoustical echoes towards complete hands-free communication systems. It is explained that an adaptive echo compensator is just one and not even the most important building block of such a system.
ae970001.pdf (Scanned)
TOPAndré Gilloire, CNET DIH/CMC (France)
Acoustic echo cancellation is usually performed using single channel signals, i.e. 1 loudspeaker signal and 1 microphone signal. Enhanced quality teleconference systems will require multi-channel signals to achieve better speaker localization and sound spatialization. However, the problem of controlling the resulting multi-channel acoustic echo turns out to be much more difficult and complicated than in the single channel case, due to specific correlation characteristics of the loudspeaker signals. This paper describes and analyzes these difficulties, and it gives an overview of current solutions proposed for solving properly the problem in the stereophonic and multi-channel cases.
ae970002.pdf (Scanned) TOPYves Grenier, ENST (France)
Microphone arrays improve the quality of sound acquisition by reducing ambient noise and jammer sources, and also by reducing the amount of reverberation. This talk will discuss the theoretical framework used in the design of microphone arrays. Practical application of the design techniques leads to several difficulties. In this talk, we will consider two kinds of errors, those induced by imperfections of the acquisition chain, and those induced by erroneous propagation models. We will focus upon a robust solution to these two problems, by means of the online identification of the transfer function of acoustic paths.
ae970003.pdf (Scanned) TOPSteven Gay, unknown
(No abstract available for this paper)
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