The Internet has revolutionized the telecommunication systems by supporting new
applications and services. Voice over Internet Protocol (VoIP) is one of the most prominent …

Speech coding is the process of compressing speech signals for transmission and storage
in communication systems. In recent years, speech coding has become increasingly …

We describe a method for monitoring Voice over IP (VoIP) applications based upon a
reduction of the ITU-T's E-Model to transport level, measurable quantities. In the process, 1) …

Packet delay and loss traces are frequently used by network engineers, as well as network
applications, to analyze network performance. The clocks on the end-systems used to …

We consider an environment where distributed data sources continuously stream updates to
a centralized processor that monitors continuous queries over the distributed data …

Excessive packet loss rates can dramatically decrease the audio quality perceived by users
of Internet telephony applications. Previous results suggest that error control schemes using …

As the Internet evolves into a ubiquitous communication infrastructure and provides various
services including telephony, it has to stand up to the toll quality standards set by traditional …

The primary aim of this paper is to present new models for objective, nonintrusive, prediction
of voice quality for IP networks and to illustrate their application to voice quality monitoring …

As the Internet evolves into a ubiquitous communication infrastructure and provides various
services including telephony, it will be expected to meet the quality standards achieved in …

The quality of service limitation of today's Internet is a major challenge for real-time voice
communications. Excessive delay, packet loss, and high delay jitter all impair the …