EBU Technical Review : No. 267 (Spring 1996)

Digital Audio Broadcasting
 

The CEPT T-DAB Planning Meeting – Wiesbaden, July 1995
K.J. Hunt, T. Cesky, T. Jeacock, M. Mägele, T. O'Leary and G. Petke (155 KB)

In the Autumn 1995 issue of EBU Technical Review, Ken Hunt offered readers some personal reflections on the CEPT T-DAB Planning Conference which took place at Wiesbaden, Germany, last July.

A detailed review of this meeting has now been made and, in this article, several delegates who played leading roles at the Conference offer readers an overview of the preparations and achievements which will permit a smooth introduction of terrestrial Digital Audio Broadcasting.

 

Radio Data System
 

RASANT: Radio Aided Satellite Navigation Technique
P. Raven, S. Sandmann and G. Schoemackers (63 KB)

The Radio Aided Satellite Navigation Technique – RASANT – provides a DGPS service in real-time, using RDS as the additional data channel.

Here, the authors describe how a Global Positioning System basically works and how the geographical resolution of such a system can be reduced to around 1 – 3 metres, by the use of RASANT.

A RASANT service is due to commence nationwide in Germany later this year.

 

Satellite Broadcasting
 

Simplified procedure for evaluating the coverage of a multifeed shaped antenna: application to the planning of a broadcasting satellite system
L. Tomati, M. D'Onofrio and G. Carere (705 KB)

Shaped antenna beams offer near-constant antenna gain throughout the nominal coverage area of a geostationary satellite. Also, they provide a fast roll-off in antenna gain outside the footprint, thus facilitating the solution of interference problems.

In this article, the authors describe a simplified analytical algorithm which can produce a set of shaped antenna PFD contours on the Earth's surface. These contours can be used as a coverage mask by the antenna manufacturer and can also provide the data input to existing software programs that calculate out-of-beam interference levels.

 

Television Production
 

EBU Seminar: "Sifting the Hype" – Television production tools for the next decade
J.J. Peters and R.A. Chalmers (80 KB)
In December 1995, the EBU held a Technical Seminar on new television production tools for the next decade. In this article, the authors give their personal views on the main elements covered by the seminar – compression, recording, archiving and routing.
 

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