ITU-R QUESTION 806-1993 Coding for the broadcasting of digitally-encoded TV signals in terrestrial narrow-band channels《地面窄带信道中数字编码电视信号的广播编码》.pdf

1、C:DOCUMENTS AND SETTINGSQGV33745MY DOCUMENTSDOWNLOADSR-QUE-SG06.80-1993-MSW-E.DOC 22.10.03 15.07.10 QUESTION ITU-R 80/6 Coding for the broadcasting of digitally-encoded TV signals in terrestrial narrow-band channels (1993) Q. ITU-R 203/11 The ITU Radiocommunication Assembly, considering a) the rapid

2、 progress being made in digital coding techniques for bit-rate reduction and error protection and in digital modulation suitable for the transmission and emission of vision signals; b) that the digital emission systems may offer advantages in terms of quality and of spectrum efficiency; c) that whil

3、e Question ITU-R 31/6 covers the preparation of a Recommendation on digital terrestrial television broadcasting systems, more general studies also need to be undertaken to supplement that work, decides that the following Question should be studied 1 What are the appropriate channel coding methods fo

4、r digital terrestrial television including HDTV broadcasting? 2 What are the appropriate methods to multiplex the required signals into the channel (including vision, sound data, etc.)? 3 What are the appropriate methods for channel error protection? 4 What are the appropriate strategies to introduc

5、e and implement such a service taking account of existing terrestrial broadcasting services? 5 What are the technical, operational and economic factors affecting the choice of scenario for conventional, enhanced and high definition television broadcasting? NOTE 1 See also Questions ITU-R 12/6, ITU-R 4/6 and ITU-R 31/6, further decides 1 that the results of the above studies should be included in (a) Recommendation(s); 2 that the studies should be completed by 2005.