WO2000072564A3 - Echokompensationseinrichtung - Google Patents

Echokompensationseinrichtung Download PDF

Info

Publication number
WO2000072564A3
WO2000072564A3 PCT/EP2000/004674 EP0004674W WO0072564A3 WO 2000072564 A3 WO2000072564 A3 WO 2000072564A3 EP 0004674 W EP0004674 W EP 0004674W WO 0072564 A3 WO0072564 A3 WO 0072564A3
Authority
WO
WIPO (PCT)
Prior art keywords
loudspeaker
room
echo
microphone system
signal
Prior art date
Application number
PCT/EP2000/004674
Other languages
English (en)
French (fr)
Other versions
WO2000072564A2 (de
Inventor
Matthias Waldorf
Original Assignee
Matthias Waldorf
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matthias Waldorf filed Critical Matthias Waldorf
Publication of WO2000072564A2 publication Critical patent/WO2000072564A2/de
Publication of WO2000072564A3 publication Critical patent/WO2000072564A3/de

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/20—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other
    • H04B3/23—Reducing echo effects or singing; Opening or closing transmitting path; Conditioning for transmission in one direction or the other using a replica of transmitted signal in the time domain, e.g. echo cancellers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/60—Substation equipment, e.g. for use by subscribers including speech amplifiers
    • H04M1/6033—Substation equipment, e.g. for use by subscribers including speech amplifiers for providing handsfree use or a loudspeaker mode in telephone sets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic
    • H04M9/082—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic using echo cancellers
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L2021/02082—Noise filtering the noise being echo, reverberation of the speech
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L21/00—Speech or voice signal processing techniques to produce another audible or non-audible signal, e.g. visual or tactile, in order to modify its quality or its intelligibility
    • G10L21/02—Speech enhancement, e.g. noise reduction or echo cancellation
    • G10L21/0208—Noise filtering
    • G10L21/0264—Noise filtering characterised by the type of parameter measurement, e.g. correlation techniques, zero crossing techniques or predictive techniques

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Computational Linguistics (AREA)
  • Quality & Reliability (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Circuit For Audible Band Transducer (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

Die Erfindung beschreibt eine Anordnung zum Kompensieren von Echos, die in einem System entstehen, das wenigstens einen Lautsprecher (1), einen echobehafteten Übertragungsraum (3) und wenigstens ein Mikrophon (2) umfaßt (Lautsprecher-Raum-Mikrophon-System) und eine zeitvariante Impulsantwort aufweist, mit einem Echoreplikator (5) zur Erzeugung einer Echoreplik durch Nachbildung der zeitvarianten Impulsantwort des Lautsprecher-Raum-Mikrophon-Systems durch Zuführung entsprechender zeitvarianter Koeffizienten (Cr), mit einer Einrichtung (6) zum Subtrahieren des Ausgangssignals des Echoreplikators von dem Ausgangssignal des Lautsprecher-Raum-Mikrophon-Systems, mit einer Einrichtung (7) zur Erzeugung eines Kalibriersignals, mit einer Einrichtung (8) zur Überlagerung des Kalibriersignals mit dem Eingangssignal des Lautsprecher-Raum-Mikrophon-Systems und mit einer Kalibriersignal-Erkennungseinrichtung (9) zur Erzeugung der genannten Koeffizienten (Cr) für den Echoreplikator (5) aus dem Kalibriersignal und dem Ausgangssignal des Lautsprecher-Raum-Mikrophon-Systems.
PCT/EP2000/004674 1999-05-24 2000-05-23 Echokompensationseinrichtung WO2000072564A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19923601A DE19923601C1 (de) 1999-05-24 1999-05-24 Echokompensationseinrichtung
DE19923601.1 1999-05-24

Publications (2)

Publication Number Publication Date
WO2000072564A2 WO2000072564A2 (de) 2000-11-30
WO2000072564A3 true WO2000072564A3 (de) 2001-07-05

Family

ID=7908910

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2000/004674 WO2000072564A2 (de) 1999-05-24 2000-05-23 Echokompensationseinrichtung

Country Status (2)

Country Link
DE (1) DE19923601C1 (de)
WO (1) WO2000072564A2 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111261179A (zh) * 2018-11-30 2020-06-09 阿里巴巴集团控股有限公司 回声消除方法及装置和智能设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4404645A (en) * 1980-08-18 1983-09-13 Elings Virgil B Correlator
EP0384490A2 (de) * 1989-02-23 1990-08-29 Nec Corporation Echokompensator mit FIR und IIR Filtern für Kompensation von Echos mit langem Ausschwingen
US5327496A (en) * 1993-06-30 1994-07-05 Iowa State University Research Foundation, Inc. Communication device, apparatus, and method utilizing pseudonoise signal for acoustical echo cancellation
EP0903726A2 (de) * 1997-09-11 1999-03-24 Digisonix, Inc. Anordnung zur aktiven unterdrückung von akustischem Echo und Geräusch

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19714966C2 (de) * 1997-04-10 1999-04-01 Siemens Ag Vorrichtung zur Rückhördämpfung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4404645A (en) * 1980-08-18 1983-09-13 Elings Virgil B Correlator
EP0384490A2 (de) * 1989-02-23 1990-08-29 Nec Corporation Echokompensator mit FIR und IIR Filtern für Kompensation von Echos mit langem Ausschwingen
US5327496A (en) * 1993-06-30 1994-07-05 Iowa State University Research Foundation, Inc. Communication device, apparatus, and method utilizing pseudonoise signal for acoustical echo cancellation
EP0903726A2 (de) * 1997-09-11 1999-03-24 Digisonix, Inc. Anordnung zur aktiven unterdrückung von akustischem Echo und Geräusch

Also Published As

Publication number Publication date
DE19923601C1 (de) 2000-10-05
WO2000072564A2 (de) 2000-11-30

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