EBU Technical Review : No. 257 (Autumn 1993)
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Digital Television |
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Planning aspects of digital terrestrial television |
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New bit-rate reduction techniques and the development of powerful modulation schemes offer the possibility of squeezing one or even more digital television programmes into an 8-MHz wide television channel. The article gives an overview of the availability of frequency bands, including the use of the so-called "taboo channels". The situations in Europe and the United States are compared. Protection ratios and minimum usable field-strength values, including margins for reliable operation of a digital service, are discussed. Using the OFDM technique, a digital service can be operated as a single-frequency network. It is shown that in addition to frequency efficiency, the SFN offers further advantages compared to other approaches. |
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Planning for terrestrial digital television |
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This article is intended as a companion to that prepared by Mr. Petke and which also appears in this issue of EBU Technical Review. It describes some of the work being undertaken within the general area of EBU Sub-group R2 and, in particular, its Specialist Group R2/DTV. The latter was set up specifically to study the possibilities open to digital television transmission in the bands allocated for terrestrial use by television services. It has rapidly been established that there are short-term as well as long-term possibilities. In the short-term, the limitations imposed by the need for coexistence between analogue and digital services give rise to difficulties which must not be underestimated. In the long term, almost everything seems to be possible! |
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Digital HDTV |
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Line numbering and synchronization
in digital HDTV systems |
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In contrast to analogue television systems where line numbering is conventionally linked to the vertical synchronization, digital television offers the possibility of incorporating line-by-line numbering embedded within the data stream. The article proposes a new numbering sequence for digital HDTV, based on the active lines. The scheme offers several advantages, in particular in respect of the time taken to achieve synchronization in digital equipment. |
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| EBU Village | |
Report on Montreux ITS 
(316 KB) |
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This article reports on the EBU Village at ITS 1993. |
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Tutorial |
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Measurement of display transfer
characteric (gamma, g) |
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| EBU Sub-group G4 (Video origination equipment) has recently completed a new EBU publication setting out recommended procedures for the measurement of the colorimetry of studio colour monitors. This EBU TUTORIAL, prepared by a member of Sub-group G4, presents the subject in rather more detail, especially as regards the mathematical treatment of measurement results, and gives a worked example. | |
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Eurovision |
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Eurovision – All change!
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| The last day of August 1993 was a red-letter day for Eurovision. As planned, it was during the night of 31st August to 1st September, soon after midnight, that the new Eurovision Control Centre in Geneva (EVC-G to those in the know) took over from the Brussels centre the task of managing the daily distribution of news exchanges (EVN) and other transmissions. | |
| * | 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 |
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