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   Acoustic echo cancellation embedded in smart transcoding algorithm between 3GPP AMR-NB Modes  
   
نویسنده fapi e.r.t. ,pastor d. ,beaugeant c. ,taddei h.
منبع journal of electrical and computer engineering - 2010 - شماره : 0
چکیده    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 10db 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 (amr-nb) modes is above 45db as required in global system for mobile communications (gsm) specifications. © 2010 emmanuel rossignol thepie fapi et al.
آدرس media application server,mas dev,genband inc.,3500 carling avenue,ottawa, Canada, institut télécom,télécom bretagne,umr cnrs 3192 lab-sticc,université européenne de bretagne, France, dsp software,business group communication solutions,infineon technologies france-r and d center,gaia-2600, France, huawei technologies co.,ltd.,eu r and d center,riesstrasse 25, Germany
 
     
   
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