New speech processing issues in IP telephony

被引：0
|
作者：
Beritelli, F [1 ]
Casale, S [1 ]
Ruggeri, G [1 ]
机构：
[1] Dipartimento Ingn Informat & Telecomunicaz, I-95125 Catania, Italy
来源：
2000 INTERNATIONAL CONFERENCE ON COMMUNICATION TECHNOLOGY PROCEEDINGS, VOLS. I & II | 2000年
关键词：
IP Telephony; speech coding; voice activity detection; comfort noise generation; multirate coding;
D O I：
暂无
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
In the field of IP Telephony there are various problems to be dealt with before the QoS currently guaranteed by PSTN networks can be achieved. Tn this paper we discuss the main causes of degradation in the quality of conversation in an IP communication scenario. We then point out some new QoS problems involved in speech processing. More specifically, two important aspects of discontinuous transmission are dealt with: the impact of the VAD on source throughput and the need for an efficient system of comfort noise. In addition, in a Differentiated services (DiffServ) scenario we demonstrate the importance of using a multirate intrastandard codec, together with valid criteria for the reconstruction of lost frames.
引用
收藏
页码：652 / 656
页数：5
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