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Wyszukujesz frazę "Stefanski, P." wg kryterium: Autor


Wyświetlanie 1-4 z 4
Tytuł:
Subjective and Objective Comparative Study of DAB+ Broadcast System
Autorzy:
Gilski, P.
Stefański, J.
Powiązania:
https://bibliotekanauki.pl/articles/177540.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
audio quality assessment
broadcasting
digital audio broadcasting
quality of experience
quality of service
radio communication
Opis:
Broadcasting services seek to optimize their use of bandwidth in order to maximize user’s quality of experience. They aim to transmit high-quality digital speech and music signals at the lowest bitrate. They intend to offer the best quality under available conditions. Due to bandwidth limitations, audio quality is in conflict with the number of transmitted radio programs. This paper analyzes whether the quality of real-time digital DAB+ broadcasted radio programs surpasses the quality offered by analog FM radio. We also perform a subjective and objective quality assessment comparative study of the HE-AAC v2 audio codec used in DAB+. The subjective studies were carried out using the MOS test methodology, whereas the objective tests were realized using the ViSQOLAudio metric. These studies were followed by a questionnaire concerning the migration from analog to digital radio domain.
Źródło:
Archives of Acoustics; 2017, 42, 1; 3-11
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality Expectations of Mobile Subscribers
Autorzy:
Gilski, P.
Stefański, J.
Powiązania:
https://bibliotekanauki.pl/articles/307922.pdf
Data publikacji:
2015
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
cellular networks
mobile communication
quality of experience
quality of service
wireless communication
Opis:
Mobile systems, by nature, have finite resources. Radio spectrum is limited, expensive and shared between many users and services. Mobile broadband networks must support multiple applications of voice, video and data on a single IP-based infrastructure. These converged services each have unique traffic holding and quality requirements. A positive user experience must be obtained through efficient partitioning of the available wireless network resources. The 3rd Generation Partnership Project (3GPP) has developed a comprehensive Quality of Service (QoS) parameter to address this problem. The regular control of service quality is critical for operators to ensure user Quality of Experience (QoE), establish new business models and monetize services. It enables operators to employ fair-use resource policies and maintain network performance during peak traffic times. Wireless mobile communication is tending towards an integrated system of Internet and telecommunication technologies, where mobile users move freely anytime and everywhere. They desire to communicate with any device using the best service available. In this paper QoS management issues in mobile communication are described. The authors present an insight into subscriber behavior and related factors that affect the QoE of mobile data services.
Źródło:
Journal of Telecommunications and Information Technology; 2015, 1; 15-19
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Digital Audio Broadcasting or Webcasting: A Network Quality Perspective
Autorzy:
Gilski, P.
Stefański, J.
Powiązania:
https://bibliotekanauki.pl/articles/308048.pdf
Data publikacji:
2016
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
broadcast technology
mobile communications
quality of experience
quality of service
wireless communication
Opis:
In recent years, many alternative technologies of delivering audio content have emerged, with different advantages and disadvantages. In this paper pros and cons of digital audio broadcasting and webcasting transmission techniques in a network quality perspective are described. A case study of user expectations with respect to currently available services is analyzed, and the perceived quality of real digital broadcasted and webcasted radio stations is examined.
Źródło:
Journal of Telecommunications and Information Technology; 2016, 1; 9-15
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Quality Aspects in Digital Broadcasting and Webcasting Systems: Bitrate versus Loudness
Autorzy:
Gilski, P.
Gajewski, S.
Stefański, J.
Powiązania:
https://bibliotekanauki.pl/articles/308210.pdf
Data publikacji:
2017
Wydawca:
Instytut Łączności - Państwowy Instytut Badawczy
Tematy:
broadcast technology
mobile communication
quality of experience
quality of service
webcast technology
wireless communication
Opis:
In this paper the quality aspects of bitrate and loudness in digital broadcasting and webcasting systems are examined. The authors discuss a survey concerning user preferences related with processing and managing audio content. The coding efficiency of a popular audio format is analyzed in the context of storing media. An objective study on a representative group of signal samples, as well as a subjective study of the perceived quality of real-time broadcasted and webcasted radio programs are performed.
Źródło:
Journal of Telecommunications and Information Technology; 2017, 2; 26-31
1509-4553
1899-8852
Pojawia się w:
Journal of Telecommunications and Information Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-4 z 4

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