Autor: Stefanski, P. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

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

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Skocz do pozycji: 3.

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

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Skocz do pozycji: 4.

Tytuł:: Can the Digital Surpass the Analog: DAB+ Possibilities, Limitations and User Expectations
Autorzy:: Gilski, P.
Stefański, J.
Powiązania:: https://bibliotekanauki.pl/articles/226204.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: audience
broadcasting
DAB+
digital audio broadcasting
electronic media
radio
telecommunications
Opis:: Radio is by far the most accessible medium. With its mobility and availability, it attracts listeners by its simplicity and friendliness. The present information situation is characterized by the convergence of computers, mobile devices, telecommunication and broadcasting technologies and the divergence of different ways of delivering and storing media. Consumers are overwhelmed by new electronic gadgets appearing every year. They are astonished by new technical innovations that are being designed to ease their life and change their habits. Even the broadcasting sector itself is facing significant changes, especially a growing competition between the private and public sector. This article reviews the current status of analog and digital broadcasting technologies. It analyzes a case study of user expectations related with today’s digital media, particularly radio transmission. We discuss the principal possibilities, limitations and user expectations related with digital audio broadcasting, as well as the economic, technological, regulatory and frequency management factors.
Źródło:: International Journal of Electronics and Telecommunications; 2016, 62, 4; 353-361
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Survey of Radio Navigation Systems
Autorzy:: Gilski, P.
Stefański, J.
Powiązania:: https://bibliotekanauki.pl/articles/227025.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: radio navigation
radio communication
satellite navigation systems
radiofrequency identification
Opis:: At present, there is a growing demand for radio navigation systems, ranging from pedestrian navigation to consumer behavior analysis. These systems have been successfully used in many applications and have become very popular in recent years. In this paper we present a review of selected wireless positioning solutions operating in both indoor and outdoor environments. We describe different positioning techniques, methods, systems, as well as information processing mechanisms.
Źródło:: International Journal of Electronics and Telecommunications; 2015, 61, 1; 43-48
2300-1933
Pojawia się w:: International Journal of Electronics and Telecommunications
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Transmission Quality Measurements in DAB+ Broadcast System
Autorzy:: Gilski, P.
Stefański, J.
Powiązania:: https://bibliotekanauki.pl/articles/221313.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: broadcast technology
Digital Audio Broadcasting
Quality of Service
transmission quality
radio communication
Opis:: In the age of digital media, delivering broadcast content to customers at an acceptable level of quality is one of the most challenging tasks. The most important factor is the efficient use of available resources, including bandwidth. An appropriate way of managing the digital multiplex is essential for both the economic and technical issues. In this paper we describe transmission quality measurements in the DAB+ broadcast system. We provide a methodology for analysing parameters and factors related with the efficiency and reliability of a digital radio link. We describe a laboratory stand that can be used for transmission quality assessment on a regional and national level.
Źródło:: Metrology and Measurement Systems; 2017, 24, 4; 675-683
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

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

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