Year 51 - Issue 2 - August 2003
|
|
Year 51 - Issue 2 - August 2003
|
|
|
 |
Cover |  |
Contents |  |
G.F. Barbieri Editorial |
||||||||
 |
M. Stroppiana Quality of image perceived on flat displays This paper reports basic information on flat screen displays, some of them selected from papers published on previous editions of this technical review and it tries to indicate why the broadcaster might be interested to the coming of flat screen displays on the consumer market. The paper could be considered an introduction to the paper "Will the coming of flat panel displays change DVB broadcasting?”, published on this same issue. |
||||||||||||
 |
M. Stroppiana, D. Wood Will the coming of flat panel displays change DVB broadcasting? This paper outlines two stages of evaluations that have been carried out by European broadcasters in the last 18 months. They concern a matter critical for the future of DVB broadcasting. If, as manufacturers claim, current television home displays are to be superseded by flat panel displays in just a few years, there may be dramatic implications for digital broadcasting. The accepted wisdom about digital channel capacity for programme channels may be quite wrong. The paper reports initial work, and draws tentative conclusions, intended to prompt others to consider these issues. The effects of codecs on picture quality depend on context and shot or scene content, and qualitative evaluations of picture quality need always to have this ‘government heath warning’ in mind. Understanding what happens to picture quality is more complex that finding average or occasional levels of impairment. The work in this paper should only be the beginning of that understanding. Nevertheless, you cannot say you have not heard a warning shot. |
||||||||||||
 |
V. Mignone, A. Morello, B. Sacco, M. Visintin CD3-OFDM: An advanced solution for DVB-T services over SFN(Single Frequency Network) The article describes the CD3-OFDM algorithm (Coded Decision Directed Demodulation – Orthogonal Frequency Division Multiplexing) developed by RAI-Crit to improve the coverage of digital terrestrial networks (DVB-T), operating on a single frequency (SFN), through amplitude and phase equalisation of the broadcast OFDM signal. The relevant performance, evaluated by computer simulations, laboratory tests and field trials, using a prototype CD3-OFDM receiver developed by RAI-Crit, proves its capacity and advantages with respect to conventional DVB-T receivers. This allows to extend the coverage area and SFN service availability, especially under critical reception conditions, as results in the following cases: use of omnidirectional antennas in portable receivers, adoption of high capacity DVB-T transmission configurations (e.g. 64QAM 2/3), high distances between network transmitters |
||||||||||||
| What it is, how it works "Elettronica e Telecomunicazioni" includes some short articles to illustrate technologies or systems adopted in the communication and broadcast fields. In this issue, there are four short articles on Display Technologies.
|
|||||||||||||
