Paper Info
Title
Acoustic echo cancellation embedded in smart transcoding algorithm between 3GPP AMR-NB modes
Abstract
Acoustic Echo Cancellation (AEC) is a necessary feature for mobile devices when the acoustic coupling between the microphone and the loudspeaker affects the communication quality and intelligibility. When implemented inside the network, decoding is required to access the corrupted signal. The AEC performance is strongly degraded by nonlinearity introduced by speech codecs. The Echo Return Loss Enhancement (ERLE) can be less than 10 dB for low bit rate speech codecs. We propose in this paper a coded domain AEC integrated in a smart transcoding strategy which directly modifies the Code Excited Linear Prediction (CELP) parameters. The proposed system addresses simultaneously problems due to network interoperability and network voice quality enhancement. The ERLE performance of this new approach during transcoding between Adaptive Multirate-NarrowBand (AMRNB) modes is above 45 dB as required in Global System for Mobile Communications (GSM) specifications.
Year
DOI
Venue
2010
10.1155/2010/902569
J. Electrical and Computer Engineering
Keywords
Field
DocType
network voice quality enhancement,communication quality,aec performance,acoustic echo cancellation,speech codecs,erle performance,echo return loss,amr-nb mode,smart transcoding strategy,low bit rate speech,network interoperability,smart transcoding algorithm
Transcoding,GSM,Code-excited linear prediction,Computer science,Electronic engineering,Decoding methods,Loudspeaker,Microphone,Codec,Intelligibility (communication)
Journal
Volume
ISSN
Citations 
2010,
2090-0147
0
PageRank 
References 
Authors
0.34
3
4
Name
Order
Citations
PageRank
Emmanuel Rossignol Thepie Fapi100.34
D. Pastor219323.93
Christophe Beaugeant314820.60
Hervé Taddei45110.67