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EP0333581A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Echo cancelling device with filtration into frequency sub-bands

Assignee: Orange SA
•
Filing: 1989-03-14
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Granted: —
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Expires: 2009-03-14
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Abstract

Abstract Translated from French Le dispositif, utilisable notamment dans les installations de téléconférence, comprend un dispositif de filtrage adaptatif interposé entre la ligne (LR) de réception de signal entrant et la ligne (LE) d'émission de signal sortant, destiné à fournir une estimation de l'écho, comprenant plusieurs voies de traitement en parallèle affectées à des sous-bandes adjacentes successives de la bande spectrale du signal sortant. Chaque voie de traitement est munie de moyens (FC) généralement de filtres croisés, synthétisant, pour la sous- bande correspondante, la composante de repliement provenant d'une autre sous-bande au moins et éliminant ladite composante en l'ajoutant au signal provenant du filtre d'analyse du signal entrant correspondant. The device, usable in particular in teleconferencing installations, comprises an adaptive filtering device interposed between the line (LR) for receiving incoming signal and the line (LE) for sending outgoing signal, intended to provide an estimate of the echo, comprising several parallel processing channels assigned to successive adjacent sub-bands of the spectral band of the outgoing signal. Each processing channel is provided with means (FC) generally of crossed filters, synthesizing, for the corresponding sub-band, the aliasing component originating from at least one other sub-band and eliminating said component by adding it to the signal originating the corresponding incoming signal analysis filter.

Inventors

  • 👤 André Gilloire
  • 👤 Martin Vetterli

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-29 15:29
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/20; H04B3/21; H04B3/23; H04M; H04M9/00; H04M9/08; H04M9/082; H04B3/238

Claims Analysis

Total Claims: 0
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References Cited (Backward Citations)

EP0091014A2 Cited
DE3431141A1 Cited

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