The quality of speech is essential in real-time communications. There are many aspects that can affect the quality of speech; one of them is the error concealment techniques that are included in the codec itself which have a significant role to recover the lost frames due to error transmission. The codec for Enhanced Voice Services (EVS) was standardized by 3GPP for LTE network. EVS has several error concealment techniques to deal with different coding modes achieving higher robustness against error transmission. This paper presents the performance evaluation of EVS codec at bit-rate 8 kbps through losing and zero padding frames from one frame to forty frames with Arabic and English languages compared with AMR-NB codec at 7.95 kbps. The testing evaluation was done using PESQ objective method. The test results show that EVS codec achieves better quality than AMR codec in case of zero padding frames by 8% and 18%, where the frames are conducted continuously and intermittently, respectively. On the other hand, by losing frames both coders are relatively close to each other by 2% in terms of quality. |
