Modelling the Arrival Process for Packet Audio
نویسندگان
چکیده
Packet audio streams can be distorted during the traversal of a packet switched network. The inter-packet spacing of the sender stream is not preserved as packets encounter queues in routers. The contribution of this work is a Markov model for the time delay variation of packetised voice traffic. Our model is extensible and we show this by adding silence suppression as well as including packet loss. By comparing the model to real traffic traces taken, we show it is possible to generate a packet audio arrival process very similar to real conditions. We illustrate this by comparing the probability density functions for our model and the captured trace data.
منابع مشابه
Quality aspects of audio communication
The Internet is increasingly being used to carry real-time voice traffic. Users of real-time voice services are sensitive to variable audio quality. The quality of packet audio is largely determined by the mouth-to-ear delay and the packet loss. The contribution of this thesis is to provide techniques to improve the packet audio quality: dimensioning links specifically for packet voice communic...
متن کاملA New Algorithm for Voice Activity Detection Based on Wavelet Packets (RESEARCH NOTE)
Speech constitutes much of the communicated information; most other perceived audio signals do not carry nearly as much information. Indeed, much of the non-speech signals maybe classified as ‘noise’ in human communication. The process of separating conversational speech and noise is termed voice activity detection (VAD). This paper describes a new approach to VAD which is based on the Wavelet ...
متن کاملAnalysis of Packet Loss and Latency Control for Robust IPTV over Mobile WiMAX and LTE Assessment (RESEARCH NOTE)
Abstract The streamed audio video (AV) content for IPTV across mobile WiMAX channel, the different schemes were discussed to reduce the noise, packet loss and latency. The objective of this paper is to verify the effectiveness of forward error correction (FEC) techniques and to suggest the techniques for robustness problems and to analysis the issues either due to AV coding encoding or due to...
متن کاملDelay Modelling for Single Cell IEEE 802.11 WLANs Using a Random Polling System
In this paper, we consider the problem of modelling the average delay experienced by a packet in a single cell IEEE 802.11 DCF wireless local area network. The packet arrival process at each node i is assumed to be Poisson with rate parameter λi. Since the nodes are sharing a single channel, they have to contend with one another for a successful transmission. The mean delay for a packet has bee...
متن کاملBetter audio performance when video stream is monitored by TCP congestion control
Conventional wisdom holds that the TCP like congestion control is unsuitable for real-time multimedia conferencing. However, our results clearly show that an audio and video conferencing system that transmits video over TCP (and audio over RTP/UDP) can provide significantly better audio quality to the end user than one built on RTP/UDP alone. We measured audio quality in terms of packet loss, p...
متن کامل