Digital Broadcasting

 

Digital video broadcasting 

Digital video broadcasting is clasified by transmission mode in three cathegories: 

  • Digital video broadcasting - terestrial, made in multiple variants: standard, for mobile devices, high definition, etc.
  • Digital video broadcasting with guided transmission (cable, optical fiber), DVB-C;
  • Digital video broadcasting - satellite, DVB-S.

 

DVB-T allows a higher quality of transmission, especially at the edge of coverage and  it makes an important economy of spectrum, which makes possible the release of frequency bands for other destinations or the introduction of additional programs.

 

DVB-C achieved packet transmissions of television channels for subscribers and, moreover, allow interactive services, various information transmission, etc.

 

Satellites communications have revolutionized television broadcasting, telephony, data transmission etc. The use of digital signal processing offered for DVB-S, as in the case of  DVB-T or DVB-C new possibilities for services and applications, and a higher quality of transmitted signal. 

 

 

Digital audio broadcasting 

Digital audio broadcasting system, DAB, was created to achieve reception in much better conditions than those offered by previously systems, which used amplitude modulation or frequency modulation. DAB was designed for the reception in mobility condition of user. Digital signal processing offers multiple possibilities for achieving a significantly improved reception quality and providing of additional services besides the classical, of programmes broadcast, with a more efficient use of frequency spectrum.

 

The Digital Radio Mondial Consortium, DRM, was formed in 1998 with the objective of designing and introducing a digital broadcasting system suitable for use in the  broadcasting bands with amplitude modulation, that use frequency bands up to 30 MHz (known as long-wave, medium and short). Subsequently, the DRM Consortium decided to extend its activities in the domain of ultrashort waves, up to 108 MHz, in which previously was used for broadcasting the frequency modulation transmission. As in the case of DAB, DRM uses digital signal processing, which enables high quality reception and a better use of spectrum.

 

INSCC implication 

The main research – development activities from digital broadcasting domain approach subjects regarding:  

  • Digital terrestrial video broadcasting system DVB-T;
  • Digital terrestrial video broadcasting system DVB-T2;
  • Data transmission system using IP over DVB-H;
  • Digital video broadcasting – satellite system, DVB-S2;
  • Digital video broadcasting – satellite to handheld system, DVB-SH;
  • Digital video broadcasting – cable system, DVB-C2;
  • Digital broadcasting system, DRM. 

  Research projects 

 Research activities carried in INSCC, in this domain, generated projects as:  

  • Study on cable digital video broadcasting system DVB-C2;
  • Study on satellite digital video broadcasting system for handheld equipments, DVB-SH;
  • Study of satellite digital video broadcasting system, DVB-S2;
  • Study on data transmission system using IP over DVB-H;
  • Study on the introduction of DVB-T2;
  • Study on digital radio mondial system evolution, DRM; prospects;
  • Presentation study of digital radio mondial system, DRM; prospects.

 

The main results obtained in research projects about digital broadcasting are:  

  • Presentation handbooks realisation for the each of studing subjects (DVB-T,   DVB-T2, DVB-H, DVB-SH, DVB-S2, DVB-C2, DRM);
  • Study regarding satellites networks utilisation for mobile communications, study achieved for MSI;
  • Comparison among different systems, with making evident of benefits and drawbacks, of working conditions etc.
  • Convergence between systems;
  • Studing of using frequency bands;
  • Analysis of services, achievement conditions, quality of these etc.;
  • Study regarding introduction evolution at european level of digital television;
  • Study of implementation conditions, expectations and solutions by exemple for DVB-H and DRM. 

 

Papers in reviews - selection:  

  • „Servicii prin sistemul de radiodifuziune digital mondial, DRM” („Digital Radio Mondial (DRM) system services”), Cristina – Gabriela Gheorghe, Telecomunicaţii, nr. 1/2011
  • „Sistemul de radiodifuziune digital mondial, DRM” („Digital radio mondial system, DRM”), Cristina – Gabriela Gheorghe, Telecomunicaţii, nr. 2/2011
  • „Sistemul de radiodifuziune video digitală prin satelit la echipamente portabile, DVB-SH” („Satellite digital video broadcasting for handheld equipments,      DVB-SH”), Cristina – Gabriela Gheorghe, Telecomunicaţii, nr. 1/2012
  • „Îmbunătățiri ale sistemului DVB-SH în comparație cu sistemul DVB-H” („Enhancements of DVB-SH system in comparison with DVB-H system”), Cristina – Gabriela Gheorghe, Telecomunicaţii, nr. 1/2013
  • „Comparație între sistemul DVB-C2 și sistemul DVB-C” („Comparison between DVB-C2 system and DVB-C system”), Cristina – Gabriela Gheorghe, Telecomunicaţii, nr. 2/2013 

 

Books: 

„Televiziunea terestră digitală, DVB-T” („Digital terrestrial television, DVB-T”), authors Ștefan-Victor NICOLAESCU, Cristina-Gabriela GHEORGHE, Liana NICOLAESCU, publishing house AGIR, 2008, ISBN 978-973-720-211-6.

 

The activity in these domain will continue with achievement of projects in domains:  

  • Programmes broadcasting from satellites;
  • Broadcasting systems;
  • Services and quality criterions for these. 

 

 

 

 

 

 

 

 

 

 

2011 Digital broadcasting - inscc. Copyright © 2014 INSCC.
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