Michal Halas
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View article: Modelling the Probability Density Function of IPTV Traffic Packet Delay Variation
Modelling the Probability Density Function of IPTV Traffic Packet Delay Variation Open
This article deals with modelling the Probability density function of IPTV traffic packet delay variation. The use of this modelling is in an efficient de-jitter buffer estimation. When an IP packet travels across a network, it experiences…
View article: E-Model MOS Estimate Precision Improvement and Modelling of Jitter Effects
E-Model MOS Estimate Precision Improvement and Modelling of Jitter Effects Open
This paper deals with the ITU-T E-model, which is used for non-intrusive MOS VoIP call quality estimation on IP networks. The pros of E-model are computational simplicity and usability on real-time traffic. The cons, as shown in our previo…
View article: Impact of network Jitter on effective equipment impairment factor
Impact of network Jitter on effective equipment impairment factor Open
The paper deals with a non-intrusive approach to the speech quality assessment and examines an
\nimpact of network jitter on effective equipment impairment factor in E-model. In order to improve currently
\nused computational E-model (ITU-…
View article: Impact of emotions on fundamental speech signal frequency
Impact of emotions on fundamental speech signal frequency Open
The paper deals with recognition of speeches made in a particular emotional state and examines the
\nimpact of person’s emotional state on the fundamental speech signal frequency. Vocal chords create audio
\nsignals which carry information…
View article: E-model MOS Estimate Improvement through Jitter Buffer Packet Loss Modelling
E-model MOS Estimate Improvement through Jitter Buffer Packet Loss Modelling Open
Proposed article analyses dependence of MOS as a voice call quality (QoS) measure estimated through ITU-T E-model under real network conditions with jitter. In this paper, a method of jitter effect is proposed. Jitter as voice packet time …
View article: Delay model of RTP flows in accordance with M/D/1 and M/D/2 Kendall's notation
Delay model of RTP flows in accordance with M/D/1 and M/D/2 Kendall's notation Open
This article deals with the mathematical model of an
\nend-to-end delay and a delay variation in VoIP connections going
\nthrough a two priority queue' serving system. We focused on delay
\ncaused by network components and its mathematical…
View article: E-model improvement for speech quality evaluation including codecs tandeming
E-model improvement for speech quality evaluation including codecs tandeming Open
Speech quality evaluation is one of the fundamental aspects of telecommunications which has been
\nfrequently discussed since the inception of Internet telephony. Voice services providers should ensure adequate
\nconnection quality to end …
View article: Delay variation model with RTP flows behavior in accordance with M/D/1 Kendall's notation
Delay variation model with RTP flows behavior in accordance with M/D/1 Kendall's notation Open
This paper focuses on the design of a
\nmathematical model of end-to-end delay of a VoIP
\nconnection, in particular on a delay variation. It describes
\nall partial delay components and mechanisms, its
\ngeneration, facilities and its mat…
View article: Mathematical Representation of VoIP Connection Delay
Mathematical Representation of VoIP Connection Delay Open
The main topic of this article is to define mathematical formulation of VoIP connection delay model. It handles about all partial delay components, the mechanism of their generation, facilities and their mathematical formulation. Thereafte…