TY - GEN
T1 - On the evaluation of VoIP perceived QoS for low-bit rate voice codecs
AU - Dagiuklas, Tasos
AU - Papazafirioit, George
PY - 2005
Y1 - 2005
N2 - This paper considers the evaluation of the perceived VoIP QoS of three low bit rate voice codecs (GSM, ADPCM and CELP) under bursty packct loss and large end-to-end delay conditions. For this purpose, samples of voicc conversations that last several minutes have been evaluated periodically by a non-homogeneous team of listeners, based on the MOS (mean opinion score). It has been evaluated that the GSM codec has shown the largest toleration to packct loss among the three codecs. As the packct loss increases, the MOS drops sharply for all types of codecs. One-way end-to-end delay up to 100 ms can be tolerated without affecting significantly the measure MOS. As the end-to-end delay gets larger than 150 ms, it affects significantly the MOS. This is due to the fact that packcts arrive late at the rcccivcr (playout buffer) and arc considered as lost. Among the three codecs, CELP experiences the largest sensitivity in terms of long one-way delays.
AB - This paper considers the evaluation of the perceived VoIP QoS of three low bit rate voice codecs (GSM, ADPCM and CELP) under bursty packct loss and large end-to-end delay conditions. For this purpose, samples of voicc conversations that last several minutes have been evaluated periodically by a non-homogeneous team of listeners, based on the MOS (mean opinion score). It has been evaluated that the GSM codec has shown the largest toleration to packct loss among the three codecs. As the packct loss increases, the MOS drops sharply for all types of codecs. One-way end-to-end delay up to 100 ms can be tolerated without affecting significantly the measure MOS. As the end-to-end delay gets larger than 150 ms, it affects significantly the MOS. This is due to the fact that packcts arrive late at the rcccivcr (playout buffer) and arc considered as lost. Among the three codecs, CELP experiences the largest sensitivity in terms of long one-way delays.
KW - Mean opinion score (MOS)
KW - Voice over internet protocol (VoIP)
KW - VoIP QoS
UR - http://www.scopus.com/inward/record.url?scp=84905263679&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84905263679
SN - 9781841022727
T3 - Proceedings of the 5th International Network Conference, INC 2005
SP - 137
EP - 144
BT - Proceedings of the 5th International Network Conference, INC 2005
T2 - 5th International Network Conference, INC 2005
Y2 - 5 July 2005 through 7 July 2005
ER -