Co-ordination channels for digital satellite news gathering (DSNG)
✍ Scribed by Roy, Alexander
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 435 KB
- Volume
- 18
- Category
- Article
- ISSN
- 0737-2884
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✦ Synopsis
This paper presents, in Section 1, a new approach to realising co-ordination channels for digital satellite news gathering (DSNG). The key element of the approach to the co-ordination channels is a direct-sequence spread-spectrum processing of the data to be transmitted which allows for the realization of an in-band transmission of the co-ordination channel signals overlaying the DSNG main channel, the part of the system which is responsible for the transmission of the audio/video signal on a point-to-point basis. The system is analysed in theory, simulation, and measurement with respect to system performance and degradation of the DSNG main channel. It shows superior system performance combined with a maximum of operational simplicity while the degradation of the DSNG main channel remains a!ordably low. Section 2 describes the DVB-DSNG system for co-ordination channels which incorporates many elements of the system presented in the "rst part but is modi"ed in some details in order to increase system #exibility. One of these details concerns the possibility to perform in-band transmission as well as transmission in the roll-o! frequency space of the DSNG main channel. In-band transmission has the advantage of great operational simplicity and is nearly identical to the system presented in Section 1. What characterizes the transmission in the roll-o! frequency space is the fact that it is more robust and DSNG main channel degradation is negligible, but this at the price of decreased operational simplicity.