Abstract
This paper presents new algorithms for acoustic echo cancellation and noise reduction which use two (or possibly more) microphone signals. In contrast to the single microphone method the multimicrophone approach can exploit the spatial coherence properties of sound fields which arise from noise and reverberated speech. Besides the standardfir echo canceller the proposed algorithms comprise an adaptive filter to eliminate non coherent signal components. The combined system achieves better Erle than thefir echo canceller alone, attenuates ambient noise, dereverberates near end speech, and possibly leads to implementations with reduced complexity. The paper analyzes the acoustical properties of typical environments, presents the algorithms and experimental results.
Résumé
Cet article présente de nouveaux algorithmes pour l’annulation d’écho et la réduction des bruits qui utilisent deux signaux (ou plus) provenant de microphones. Au contraire des méthodes utilisant un seul microphone, les approches à plusieurs microphones peuvent tirer parti des propriétés de cohérence spatiale des champs sonores qui sont générées par des bruits ou de la parole réverbérée. En plus de l’annuleur d’écho standard fir, les algorithmes proposés se caractérisent par la présence d’un filtre adaptatif dédié à l’élimination des composantes non cohérentes des signaux. Le système combiné permet d’obtenir un meilleur facteur Erle que l’annuleur d’écho fir seul. De plus, il atténue les bruits ambiants, déréverbère la parole proche et mène probablement à une réalisation dont la complexité serait réduite. L’article analyse les propriétés acoustiques d’environnements sonores typiques, présente les algorithmes et les résultats expérimentaux.
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Martin, R., Vary, P. Combined acoustic echo cancellation, dereverberation and noise reduction: a two microphone approach. Ann. Télécommun. 49, 429–438 (1994). https://doi.org/10.1007/BF02999431
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DOI: https://doi.org/10.1007/BF02999431
Key words
- Telephone
- Echo
- Acoustic signal
- Echo canceller
- Acoustic noise
- Ambient noise
- Noise reduction
- Spatial coherence
- Diffuse reflection