Brazil is one of the few great countries of the world that not yet decided which standard of
transmission of digital TV will
adopt. One of the causes of this delay is fact of former-Minister of the Miro Communications Teixeira to insist for the development of a Brazilian proper standard. The direct consequence in the delay of this decision is that Brazil leaves stops backwards in comparison to the too much markets of the world, including other important developing countries such as Mexico, Russia, India and China, that already had decided which standard to follow. Another detail is that the FCC (the North American Anatel) stipulated that until May of 2006 all the transmissions of TV opened in U.S.A. will have of being digital. In the world three standards exist: ATSC (Advanced Television Systems Committee), adopted for U.S.A., Canada, Mexico and Korea of the south; ISDB-T (Integrated Services Digital Broadcasting Terrestrial), adopted for Japan; DVB-T (Digital Video Broadcast Terrestrial), adopted for the too much countries that already had decided which standard to follow, in special the countries of the Europe, Asia, Africa and Oceania. The system of digital
transmission uses
codification MPEG-2 to digitalizar the images, the same used standard of codification for the DVD. The difference enters the transmission systems is in the way with that the images are codified for the transmission, the format of video before the codification, the video format after the codification and the way with that the audio one is codified. System ATSC uses a called project 8-VSB, while the others two systems use a called project COFDM, that is less sensible the interferences. Interesting to notice that Brazil is the only country in the world thinking about adopting the Japanese system. Tests carried through for the ABERT (Brazilian Association of Senders of Radio and Television) and for the SET (Brazilian Society of Engineering of Television and Telecommunications) under supervision of the CPqD (Center of Research and Development in Telecommunications) demonstrated that of the three standards, the ISDB-T was optimum, followed of the DVB-T and finally for the ATSC