MX9702958A - Eliminacion de ecos utilizando correlacion cruzada de segmentos de muestra de recepcion y transmision con almacenamiento intermedio para determinar coeficiente de filtro de cancelacion. - Google Patents

Eliminacion de ecos utilizando correlacion cruzada de segmentos de muestra de recepcion y transmision con almacenamiento intermedio para determinar coeficiente de filtro de cancelacion.

Info

Publication number
MX9702958A
MX9702958A MX9702958A MX9702958A MX9702958A MX 9702958 A MX9702958 A MX 9702958A MX 9702958 A MX9702958 A MX 9702958A MX 9702958 A MX9702958 A MX 9702958A MX 9702958 A MX9702958 A MX 9702958A
Authority
MX
Mexico
Prior art keywords
cross
correlation
signals
filter coefficients
echo cancellation
Prior art date
Application number
MX9702958A
Other languages
English (en)
Other versions
MXPA97002958A (es
Inventor
Douglas Mackay Traill
Philip Julian Sheppard
Jianxiong Bai
Simon Milner
Original Assignee
British Telecomm
Company
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 British Telecomm, Company filed Critical British Telecomm
Publication of MX9702958A publication Critical patent/MX9702958A/es
Publication of MXPA97002958A publication Critical patent/MXPA97002958A/es

Links

Classifications

    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

Un sistema de deteccion de eco que comprende memorias intermedia de datos (8, 18) para almacenar señales de canales superior e inferior (5, 15) respectivamente. Las señales sufren el pre-procesamiento (9, 19) para identificar las formas de señales características del diálogo e instruir a la unidad de medicion (10) para realizar la comparacion utilizando técnicas de correlacion cruzada entre las señales almacenadas en las memorias intermedias (8, 18) solamente cuando se detectan tales características. Esto reduce la energía de procesamiento requerida e incrementa la exactitud de las correlaciones. Las técnicas de procesamiento paralelas permiten que se detecten ecos con periodos de retraso más largos. Los resultados de la medicion pueden ser utilizados para generar una señal de cancelacion de eco (unidades 7, 17).
MXPA/A/1997/002958A 1994-11-10 1997-04-23 Eliminacion de ecos utilizando correlacion cruzada de segmentos de muestra de recepcion y transmision con almacenamiento intermedio para determinar coeficiente de filtro de cancelacion MXPA97002958A (es)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP94308290.9 1994-11-10
EP94308291 1994-11-10
EP94308290 1994-11-10
EP94308291.7 1994-11-10

Publications (2)

Publication Number Publication Date
MX9702958A true MX9702958A (es) 1998-10-31
MXPA97002958A MXPA97002958A (es) 1999-01-11

Family

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Also Published As

Publication number Publication date
CA2202910A1 (en) 1996-05-23
NO972151D0 (no) 1997-05-09
NO972151L (no) 1997-05-09
DK0791251T3 (da) 1999-04-19
FI971984A0 (fi) 1997-05-09
CA2202910C (en) 2001-09-25
ES2120240T3 (es) 1998-10-16
IL115892A (en) 1999-05-09
DE69503518T2 (de) 1998-12-10
AU3849595A (en) 1996-06-06
JPH10508992A (ja) 1998-09-02
HK1002798A1 (en) 1998-09-18
WO1996015597A1 (en) 1996-05-23
CN1163026A (zh) 1997-10-22
EP0791251B1 (en) 1998-07-15
EP0791251A1 (en) 1997-08-27
DE69503518D1 (de) 1998-08-20
FI971984A (fi) 1997-05-09
NZ295206A (en) 1998-04-27
US6078567A (en) 2000-06-20
KR970707649A (ko) 1997-12-01
AU691045B2 (en) 1998-05-07
IL115892A0 (en) 1996-01-31
CN1086072C (zh) 2002-06-05

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