EBU Technical Review : No. 259 (Spring 1994)
|
Digital HDTV |
|
|
Flash-TV – The flexible bit-rate
solution for satellite outside-broadcasting of digital HDTV |
|
| Satellite transmission has become a regular feature of the outside broadcasting activities of broadcasters. Looking ahead to the era of digital HDTV broadcasting, the FLASH-TV project of the RACE II programme has been developing solutions for satellite outside broadcasting of programme material having source bit-rates of the order of up to 70 Mbit/s. The proposed system exploits the graceful degradation achieved with modern video coding algorithms to allow a reduction in bit-rate on the satellite link during periods of adverse reception, whilst maintaining acceptable picture quality. | |
|
DAB |
|
|
DAB multiplex and system support
features |
|
|
This article describes the multiplex and system support features of the Eureka 147/DAB digital audio broadcasting system. It sets out the requirements of all users along the broadcast chain, from service providers and broadcaster through to the listener. The contents of the transmission frame are examined, drawing the distinction between the main service multiplex and the provision of control information in a separate fast data channel. The concept of the DAB service structure is introduced and the inherent system flexibility for altering the service arrangement is explained. A wide range of service information features build on those provided in earlier systems, such as the Radio Data System, and are intended to make it easier for a listener to find any required service and to add a further dimension to audio broadcasting. The choices available to users in all of these areas are examined. |
|
|
Future Television Systems |
|
|
A Global Approach to studies in
television broadcasting |
|
| Detailed technical investigations are in progress, worldwide, concerning new television broadcasting systems. These range from relatively simple enhancements of today's systems, to futuristic concepts for digital stereoscopic and 3-D HDTV. It is necessary to establish a clear view of the opportunities presented by these varied developments, and the time is right to formulate the tasks and strategies that will pave the way into the 21st century. The world forum for standard- setting in this field is the ITU Radiocommunication Sector (ITU-R), and Study Group 11 (Television broadcasting) in particular. Here, in a wide- ranging reflection on options and opportunities for the immediate and longer-term future, the Chairman of Study Group 11 first outlines the work now being carried out within the ITU. There follows a discussion on the new approaches and strategies that characterize the forthcoming Study Period (1994-95), and on the challenges that lie ahead. | |
| * | Head of Publications and Internet Co-ordinator: | P. Jaquin |
| * | Editeur Responsable: | P.A. Laven |
| * | Editor: | M.R. Meyer |
| * | French Editor: | E. Piraux |
| European Broadcasting Union Case postale 45 Ancienne Route 17A CH-1218 Grand-Saconnex Geneva Switzerland techreview@ebu.ch |
 |
