Temat: packet loss - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Wpływ transmisji głosu z wykorzystaniem telefonii internetowej VoIP na skuteczność automatycznego systemu kryminalistycznej identyfikacji mówców opartego na metodzie EM-UBM-MAP
The impact of voice transmission using VoIP Internet Telephony on the efficiency of forensic of an automatic speaker recognition system based on EM-UBM-MAP*
Autorzy:: Maciejko, Waldemar
Powiązania:: https://bibliotekanauki.pl/articles/499794.pdf
Data publikacji:: 2014
Wydawca:: Centralne Laboratorium Kryminalistyczne Policji
Tematy:: Voice over Internet Protocol
kryminalistyczna identyfikacja mówców
model Gilberta
utrata pakietów
kompresja dźwięku
standard H.323
the forensic speaker recognition Gilbert model, packet loss
audio compression
the H.323 standard
Opis:: W niniejszej pracy zbadano wpływ transmisji pakietowej na skuteczność systemu automatycznej identyfikacji mówców pracującego w oparciu o bayesowski klasyfikator LR. Modelowanie statystyczne w systemie prowadzone jest z wykorzystaniem algorytmów EM-GMM oraz MAP. W badaniach założono, że z transmisją pakietową wiążą się dwa zjawiska: utrata pakietów oraz kodowanie sygnału. W badaniach wykorzystano niektóre kodeki audio standardu H.323 ITU-T. Zjawisko utraty pakietów przybliżono za pomocą dwustanowego modelu Gilberta. Wyniki badań przedstawiono w postaci charakterystyk Tippetta.
In this study, the effect of packet transmission on the effectiveness of the automatic speaker recognition system was examined, working on the basis Bayesian classifier LR. Statistical modelling of the system is carried out using algorithms EM-GMM and MAP. The study assumed that the packet transmission is associated with the occurrence of loss and encoding of the signal. In the research, some codecs of the audio standard H.323 ITU-T were used. The occurrence of the packet loss was described by means of a Gilbert digital model. Test results of performed tests are presented in Tippett plots.
Źródło:: Problemy Kryminalistyki; 2014, 283
0552-2153
Pojawia się w:: Problemy Kryminalistyki
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Transient and stationary characteristics of a packet buffer modelled as an MAP/SM/1/b system
Autorzy:: Rusek, K.
Janowski, L.
Papir, Z.
Powiązania:: https://bibliotekanauki.pl/articles/330560.pdf
Data publikacji:: 2014
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: router interface
Markovian arrival process
semi Markov service time
hidden Markov model
finite buffer queue
packet loss
first passage time
proces Markowiana
model Markowa niejawny
utrata pakietu
Opis:: A packet buffer limited to a fixed number of packets (regardless of their lengths) is considered. The buffer is described as a finite FIFO queuing system fed by a Markovian Arrival Process (MAP) with service times forming a Semi-Markov (SM) process (MAP/SM/1/b in Kendall’s notation). Such assumptions allow us to obtain new analytical results for the queuing characteristics of the buffer. In the paper, the following are considered: the time to fill the buffer, the local loss intensity, the loss ratio, and the total number of losses in a given time interval. Predictions of the proposed model are much closer to the trace-driven simulation results compared with the prediction of the MAP/G/1/b model.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2014, 24, 2; 429-442
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: The Effect of Voice over IP Transmission Degradations on MAP-EM-GMM Speaker Verification Performance
Autorzy:: Maciejko, W.
Powiązania:: https://bibliotekanauki.pl/articles/177874.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: automatic speaker verification
packet loss
speech compression
voice over IP
Opis:: Despite the growing importance of packet switching systems, there is still a shortage of thorough analyses of VoIP transmission effect on speech and speaker recognition performance. Voice over IP transmission systems use packet switching. There is no guarantee of delivery. The main disadvantage of VoIP is a packet loss which has a major impact on the performance experienced by the users of the network. There are several techniques to mask the effects of a packet loss, referred to as packet loss concealment. In this study, the effect of voice transmission over IP on automatic speaker verification system performance was investigated. The analyzed system was based on MAP-EM-GMM modelling methods. Four various speech codecs of H.323 standard were investigated with special emphasis placed on the packet loss phenomenon and various packet loss concealment techniques.
Źródło:: Archives of Acoustics; 2015, 40, 3; 407-417
0137-5075
Pojawia się w:: Archives of Acoustics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Simple analysis of the impact of packet loss and delay on voice transmission quality
Autorzy:: Perlicki, K.
Powiązania:: https://bibliotekanauki.pl/articles/309277.pdf
Data publikacji:: 2002
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: E-model
packet network
packet loss
delay
transmission quality rating
Opis:: In this paper a simple analytical expression based on E-model is applied to analyse the impact of packet loss and delay on voice transmission quality. The relationship between overall transmission quality rating, packet loss and delay G.711, G.723 and G.729 codes is presented.
Źródło:: Journal of Telecommunications and Information Technology; 2002, 2; 53-56
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: QoS Conditions for VoIP and VoD
Autorzy:: Dymarski, P.
Kula, S.
Huy, T. N.
Powiązania:: https://bibliotekanauki.pl/articles/307870.pdf
Data publikacji:: 2011
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: delay jitter
packet loss rate
PESQ
POLQA
quality of service
VoD
VoIP
VQM
VQmon
Opis:: This paper concerns quality evaluation of the telecommunication services: VoIP (representing the RT interactive class) and VoD (representing the MM streaming class). Subjective and objective methods and tools for perceived quality measurement are analyzed and compared. Subjective tests are performed for selected video sequences using the Double-Stimulus Impairment Scale (DSIS) method. Thus the objective algorithms (VQM and VQmon) are calibrated. Speech quality is measured using the objective methods: PESQ and POLQA. Threshold values for network parameters (packet loss rate, delay jitter) are set, that guarantee the acceptable service quality.
Źródło:: Journal of Telecommunications and Information Technology; 2011, 3; 29-37
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Performance evaluation of an M/G/n-type queue with bounded capacity and packet dropping
Autorzy:: Tikhonenko, O.
Kempa, W. M.
Powiązania:: https://bibliotekanauki.pl/articles/331288.pdf
Data publikacji:: 2016
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:: AQM algorithm
finite buffer
loss probability
total packet volume
queue size distribution
aktywne zarządzanie kolejką
prawdopodobieństwo straty
rozkład wielkości kolejki
Opis:: A queueing system of the M/G/n-type, n ≥ 1, with a bounded total volume is considered. It is assumed that the volumes of the arriving packets are generally distributed random variables. Moreover, the AQM-type mechanism is used to control the actual buffer state: each of the arriving packets is dropped with a probability depending on its volume and the occupied volume of the system at the pre-arrival epoch. The explicit formulae for the stationary queue-size distribution and the loss probability are found. Numerical examples illustrating theoretical formulae are given as well.
Źródło:: International Journal of Applied Mathematics and Computer Science; 2016, 26, 4; 841-854
1641-876X
2083-8492
Pojawia się w:: International Journal of Applied Mathematics and Computer Science
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Impact of the duration of speech sequences on speech quality
Autorzy:: Pocta, P.
Vaculík, M.
Powiązania:: https://bibliotekanauki.pl/articles/308555.pdf
Data publikacji:: 2007
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: voice transmission quality of service
speech sequence
intrusive measurement
perceptual evaluation of speech quality
jitter rate
packet loss
Opis:: This paper describes simulations of speech sequences transmission for intrusive measurement of voice transmission quality of service (VTQoS) in the environment of IP networks. The aim of the simulations was to investigate the impact of the different durations of speech sequences on speech quality from the jitter rate and packet loss point of view in IP networks. The ITU-T G.729 and ITU-T G.723.1 encoding schemes were used for the purpose of the simulations. The assessment of speech quality was realized by means of perceptual evaluation of speech quality (PESQ) algorithm. A comparison of the impact of different durations of speech sequences on speech quality and determination of the optimal duration of speech sequence for measurements of speech quality in telecommunication networks, is the aim of this paper.
Źródło:: Journal of Telecommunications and Information Technology; 2007, 4; 72-76
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Imitation modeling of the routing process based on fuzzy logic
Model symulacji procesu routingu opartego na logice rozmytej
Autorzy:: Lesovoy, I.
Pylypenko, G.
Powiązania:: https://bibliotekanauki.pl/articles/408625.pdf
Data publikacji:: 2018
Wydawca:: Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:: fuzzy logic
routing
load
packet loss
logika rozmyta
obciążenie
utrata pakietów
Opis:: The paper discusses the details of modeling of the routing process according to the loading of output buffer storage. Shows the obtained dependence of the fraction of lost packets from the input intensity. It is shown that taking into account buffer occupancy increases the efficiency of their use and can significantly affect the quality of the functioning of the telecommunications network in the face of considerable.
W niniejszym artykule zostały omówione cechy symulacji procesu routingu uwzględniające nośność buforów wyjściowych napędu. Otrzymano zależność frakcji zagubionych pakietów od intensywności strumienia wejściowego. Wykazano, że uwzględnienie obciążenia bufora zwiększa efektywność ich użytkowania i może znacząco wpłynąć na wydajność sieci telekomunikacyjnej w warunkach znacznego obciążenia.
Źródło:: Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska; 2018, 8, 1; 16-19
2083-0157
2391-6761
Pojawia się w:: Informatyka, Automatyka, Pomiary w Gospodarce i Ochronie Środowiska
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Efficient Performance and Lower Complexity of Error Control Schemes for WPAN Bluetooth Networks
Autorzy:: El-Bendary, M. A. M.
El-Tokhy, M. A. R.
Powiązania:: https://bibliotekanauki.pl/articles/308324.pdf
Data publikacji:: 2014
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: Bluetooth
EDR
packet loss
power efficiency
Wireless Personal Area Network
Opis:: This paper presents a new technique of reduction retransmission time by decreasing the discarded packets and combating the complexity through error control techniques. The work is based on Bluetooth, one of the most common Wireless Personal Area Network. Its early versions employ an expurgated Hamming code for error correction. In this paper, a new packet format using different error correction coding scheme and new formats for the EDR Bluetooth packets are presented. A study for the Packet Error Probability of classic and Enhanced Data Rate (EDR) packets is also presented to indicate the performance. The simulation experiments are performed over Additive White Gaussian Noise (AWGN) and Rayleigh flat-fading channels. The experimental results reveal that the proposed coding scheme for EDR packets enhances the power efficiency of the Bluetooth system and reduce the losses of EDR packets.
Źródło:: Journal of Telecommunications and Information Technology; 2014, 4; 100-107
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Burst Ratio in Concatenated Markov-based Channels
Autorzy:: Rachwalski, J.
Papir, Z.
Powiązania:: https://bibliotekanauki.pl/articles/307592.pdf
Data publikacji:: 2014
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: burst ratio
bursty packet loss
E-Model
quality of service
voice over IP
Opis:: This paper deals with the burst ratio parameter, which describes the burstiness of a packet loss observed in digital networks. It is one of the input parameters of E-model – the most widely used method of assessing conversational quality of telephony. The burst ratio is defined for one channel scenario so it can be calculated when the whole transmission path has been characterized by a single set of parameters. The main objective of the paper is to extend the burst ratio definition when the transmission path is defined as a tandem concatenation of transmission channels being described by their individual burst ratios. It is assumed that packet loss of a single channel is described by a 2-state Markov chain. The final result of the research is an equation describing the burst ratio parameter when the transmission path consists of multiple concatenated channels. The derived formula has been validated by extensive simulations.
Źródło:: Journal of Telecommunications and Information Technology; 2014, 1; 3-9
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Analysis of The Effectiveness of Online Electronic Learning System Using Data Traffic Network Performance Management to Succeed Merdeka Learning : Merdeka Campus During the Covid-19 Pandemic
Autorzy:: Budiyanto, Setiyo
Silalahi, Lukman Medriavin
Silaban, Freddy Artadima
Sitorus, Henry Binsar Hamonangan
Rochendi, Agus Dendi
Ismail, Mochamad Furqon
Powiązania:: https://bibliotekanauki.pl/articles/2055225.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: delay
throughput
packet loss
education
Opis:: The problems in the Covid-19 pandemic have a major influence on the field of education with the use of technology to support the teaching and learning process to facilitate students who do home learning activities. The proposed concept of freedom of learning is a more comprehensive concept such as portfolio and assignments such as group assignments, writings, and so on that are done in full online by adding additional features such as Teaching and Learning Activities and Assessment through information technology media. (E-Learning / Learning Management System). The method proposed in this research is the Peer Connection Queue (PCQ) method on mikrotik operating systems. PCQ method is a program to manage network traffic in Quality of Services (QoS). Bandwidth management methods. The hypothesis formulated is to create bandwidth management with PCQ so that bandwidth sharing is automatically and evenly distributed to multi clients. Therefore, in this research finally formulated into the goal of E-Learning effectiveness analysis using bandwidth management analysis method, which will be measured and analyzed in this research is throughput, delay, jitter, and packet loss. So that the final result of this research obtained the feasibility of the teaching and learning process that is carried out effectively.
Źródło:: International Journal of Electronics and Telecommunications; 2021, 67, 4; 595--601
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Analysis of Burst Ratio in Concatenated Channels
Autorzy:: Rachwalski, J.
Papier, Z.
Powiązania:: https://bibliotekanauki.pl/articles/309539.pdf
Data publikacji:: 2015
Wydawca:: Instytut Łączności - Państwowy Instytut Badawczy
Tematy:: bursty packet loss
E-model
quality of experience
voice over IP
Opis:: Burst ratio is a parameter that quanties packet loss patterns in transmission networks. It has been dened for an end-to-end scenario, therefore burst ratio can be determined only if the characteristics of the whole transmission path are known. In this paper, the burst ratio parameter applicability to cases when the transmission path consists of a series of transmission channels with known packet loss rate and burst ratio values is extended. The paper also presents the results of simulations performed with NS2 software, demonstrating the validity of the burst ratio analysis. Consequently, the research makes it possible to determine the value of the burst ratio parameter in concatenated packet networks, which in turn supports delivering higher quality VoIP services.
Źródło:: Journal of Telecommunications and Information Technology; 2015, 4; 65-73
1509-4553
1899-8852
Pojawia się w:: Journal of Telecommunications and Information Technology
Dostawca treści:: Biblioteka Nauki

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