1、- 1 - CACE/344 Place des Nations Telephone +41 22 730 51 11 Telex 421 000 uit ch E-mail: itumailitu.int CH-1211 Geneva 20 Telefax Gr3: +41 22 733 72 56 Telegram ITU GENEVE www.itu.int Switzerland Gr4: +41 22 730 65 00 QUESTION ITU-R 31-1/6 Digital terrestrial television broadcasting (1992-1993-2002-
2、2005) The ITU Radiocommunication Assembly, considering a) the rapid progress being made in techniques for bit-rate reduction and for digital modulation; b) that digital emission systems may offer advantages in terms of quality and of spectrum efficiency and that some administrations were planning th
3、eir introduction in 1995; c) that bit-rate reduction coding of digital TV signals will find wide application for emission by terrestrial and satellite means, for secondary distribution by cable and optical fibre and for pre-recorded delivery media; d) that there are advantages in having a maximum of
4、 common elements for the bit-rate reduction codings in the various applications; e) that a number of Radiocommunication Groups are studying or are considering the use of bit-rate reduction techniques, including Study Group 6, Working Party 6S, Working Party 6R for a variety of related applications;
5、f) that commonality with the bit-rate reduction techniques used in related applications (such as equipment for home use) considered by the International Electrotechnical Commission (IEC), the International Organization for Standardization (ISO) and the ITU-T may offer further advantages; g) that var
6、ious kinds of applications, for example multi-channel TV, multi-channel sound applications, ancillary data applications, indoor/outdoor portable and mobile reception of TV programs will be introduced as new attractive applications with high flexible and efficiency in multiplex operation; h) that hig
7、h performance error protection methods will be introduced from the point of view of transmission efficiency and easy implementation in home, portable and mobile receivers; j) that digital modulation methods suitable for the terrestrial transmission paths will be used; k) that strategies of harmoniza
8、tion with existing terrestrial broadcasting will be adopted, decides that the following Question should be studied 1 What are the appropriate methods to multiplex the required signals into the channel (including vision, sound, data, etc.)? 2 What are the appropriate methods for error protection? - 2
9、 - CACE/344 C:DOCUMENTS AND SETTINGSQGV33745MY DOCUMENTSDOWNLOADSR-QUE-SG06.31-1-2005-MSW-E.DOC 3 What are the appropriate modulation and emission methods and their relevant parameters, for the broadcasting of digitally encoded TV signals in terrestrial channels? 4 What are the appropriate strategie
10、s to introduce and implement digital terrestrial TV broadcast services, taking account of existing terrestrial broadcast services? 5 What are other applications that could be provided by digital terrestrial TV systems? NOTE 1 See also Questions ITU-R 12/6, ITU-R 80/6 and ITU-R 4/6, further decides 1 that the results of the above studies should be included in (a) Recommendation(s); 2 that the above studies should be completed by 2006. Category: S1
