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Wyświetlanie 1-3 z 3
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
Artykuł
Tytuł:
Open concurrent network communication methods in building distributed Web applications
Autorzy:
Buchwald, Paweł
Dawid, Aleksander
Powiązania:
https://bibliotekanauki.pl/articles/1986993.pdf
Data publikacji:
2021-12-30
Wydawca:
Politechnika Gdańska
Tematy:
WebRTC
e-learning
LTE
LAN
WiFi
video transmission
jitter
delay
bandwidth
Opis:
The attractiveness of real-time multimedia communication as part of an e-learning platform largely depends on the quality of the telecommunications infrastructure and on theservices that support the exchange of audiovisual data. The research subject of this workis communication between stationary and mobile devices using distributed services such as Web Real-Time Communication (WebRTC) running in HTML5 compliant web browsers. The test connections were carried out in a peer-to-peer architecture over a local wireless WiFi network and a mobile network supporting the Long Term Evolution (LTE) standard for data interchange. Several audiovisual sessions between two clients were analyzed for different connection scenarios. Parameters responsible for the transmission quality, such as delay, jitter,packet loss, or the speed of sending and receiving video frames were measured for each scenario. Open audiovisual communication system performance experiments were conducted under real operating conditions. The obtained results indicated potential applications in the development of e-learning websites.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2021, 25, 4; 409-418
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of Selected Timing Parameters of FPGA Device
Autorzy:
Sondej, D.
Szymanowski, R.
Szplet, R.
Powiązania:
https://bibliotekanauki.pl/articles/114158.pdf
Data publikacji:
2018
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
propagation time
jitter
ring oscillator
delay line
carry chain
LUT
FPGA
Opis:
We present a method and results of measurements of FPGA (Field Programmable Gate Array) selected timing parameters crucial in many timing sensitive applications such as precise time and frequency metrology. Two main parameters, i.e. the delay and its jitter, were evaluated for look-up-tables (delay 740 ps/jitter 1.33 ps), IO buffers (na/0.45 ps) and carry-chain multiplexers (28ps/0.153 ps) integrated in a programmable device Spartan-6 (Xilinx) which is one of most popular FPGA chips on the market now. Measurements were performed with the use of fast real-time sampling oscilloscope.
Źródło:
Measurement Automation Monitoring; 2018, 64, 1; 23-25
2450-2855
Pojawia się w:
Measurement Automation Monitoring
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-3 z 3

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