Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Subband Acoustic Echo Cancelling using LMS and RLS
Responsible organisation
1999 (English)Report (Other academic)Alternative title
Akustisk Delbands Eko-släckare med LMS och RLS (Swedish)
Abstract [en]

The increasing use of modern hands free communication systems such as video conferencing, computer communications, and vehicle mounted cellular telephones brings the demand for high-quality acoustic echo cancellation up to focus. In these applications the echo path which has to be identified typically has long time duration, the order of 100 ms. For this identification the length of the filter will be long. This report evaluates the Normalized Least Mean Square (NLMS) and the Weighted Recursive Least Square (WRLS) algorithms for acoustic echo cancelling using a delayless subband scheme. Subband signal processing has shown to be efficient both when it comes to convergence rate and level of echo suppression. The evaluation is performed for real speech signals sampled from a conversation using a hands free set mounted in an automobile, and a conversation using conference telephony equipment in a conference room. A comparison of subband and fullband algorithms is made both with respect to the computational cost and level of echo suppression. Results show that when the impulse response is very long, i.e. in such environments as conference rooms, the subband approach is beneficial. In a car environment the size of enclosure and damping means that the response is quite short and a conventional echo canceller could perform as well as a subband echo canceller. In the study, finite word length effects have not been considered.

Abstract [sv]

Rapporten utvärderar Akustisk Eko-släckning under verkliga rumsförhållanden för bl.a. konferens telefoni. Vi visar att i stora lokaler uppstår problem med konventionella metoder och föreslår därför att använda delbands-metoder. Resultat med verkliga data simuleringar presenteras.

Place, publisher, year, edition, pages
1999.
Series
Blekinge Tekniska Högskola Forskningsrapport, ISSN 1103-1581 ; 5
Keyword [en]
Subband, Echo cancelling, Hands free, Conference telephony
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:bth-00142Local ID: oai:bth.se:forskinfoDB699B42B86E005FC12568A3002CABF2OAI: oai:DiVA.org:bth-00142DiVA: diva2:837328
Available from: 2012-09-18 Created: 2000-03-15 Last updated: 2015-06-30Bibliographically approved

Open Access in DiVA

fulltext(1679 kB)113 downloads
File information
File name FULLTEXT01.pdfFile size 1679 kBChecksum SHA-512
036b687654a169e1a10b29e7d2a0888cc7d8f8a3c4d642fe5ba2d411da0bd0d10efdaade0d98018145c30f99f1b85359781f156786da1b210aeebb620661e8a5
Type fulltextMimetype application/pdf

Signal Processing

Search outside of DiVA

GoogleGoogle Scholar
Total: 113 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

urn-nbn

Altmetric score

urn-nbn
Total: 91 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf