The conversational quality of a VoIP communication is dependent on several factors such as
the coding process used, the network conditions and the type of error correction or …

Delay, echo, encoding scheme, and packet loss all influence perceived quality of
conversational speech transmitted over packet networks. Therefore, the choice of a buffer …

The factors causing perceptual quality impairment on voice-over-IP (VoIP) connections
include traditional network quality-of-service (QoS) parameters like packet loss rate, delay or …

This survey gives a comprehensive review of recent advances related to the topic of VoIP
QoE (Quality of user'Experience). It starts by providing some insight into the QoE arena and …

We present an instrumental approach on how to assess the perceptual quality of voice
transmissions in IP-based communication networks. Our approach is end-to-end and uses …

We designed and implemented a system that permits the measurement of network Quality of
Service (QoS) parameters. This system allows us to objectively evaluate the requirements of …

There are many types of degradation which can occur in Voice over IP (VoIP) calls. Of
interest in this work are degradations which occur independently of the codec, hardware or …

Quality models predict the perceptual quality of services as they calculate subjective ratings
from measured parameters. In this article, we present a new quality model that evaluates …

The need to evaluate voice quality in VoIP (Voice over IP) applications is an important
requirement for technical and commercial reasons. This may involve subjective and/or …

This paper presents a mathematical model that has been created from the subjective MOS,
instead of modifying or improving the existing objective measurement methods (eg, E …