theibcdaily Monday 16.09.13 69
Optimising digital terrestrial deployments
The transition to DVB-T2 is core to many regions across the world and new technologies can deliver huge cost benefits, explains Regis Le Roux, president & CEO, Enensys
It’s inevitable in any technology-dominated industry that there are developments that grab the headlines: connected TV has been one example recently; Ultra-HD (or 4K) is now another. IBC has been full of announcements about the latter. But at the same time we live
in a broadcast world that is becoming increasingly diverse at a more fundamental level: the way consumers receive TV signals, from ancient analogue terrestrial systems to bandwidth-hungry OTT IP services. In reality, the vast majority of us receive broadcast TV via terrestrial, satellite or cable. Across the world there are
many regions that are only now looking at – or beginning the move to – one of those mentioned distribution methods: digital terrestrial (DTT). Core to that has been the development of DVB-T2, the second, more efficient and powerful iteration of the DVB digital terrestrial standard.
There are already more than 30 DVB-T2 deployments with at least another ten planned for the next six to 12 months across Africa, Asia and Europe. We have been involved in
the majority of these deployments. But there have been significant challenges involved so far, not least in terms of ensuring signal robustness while allowing a strong diversity of content. Enensys Technologies,
founded in 2004 by digital TV professionals, has been working to break down a key technology and cost efficiency barrier: the ability to use the same satellite network to deliver services for DTH users (DVB-S2) and DTT users (DVB- T or DVB-T2). Enensys has years of experience in the design and manufacturing of digital TV transmission systems. Our products sit between encoding/multiplexing and transmission, facilitating signal distribution over a wide variety of networks including IP.
Until now two different
networks have been required to deliver a content bouquet to DTH and DTT (DVB-T2) viewers. This is because receivers for one cannot receive the signal for the other due to transport stream differences. Now the same satellite transponders can be used for both DTH services and DTT distribution network courtesy of our new solution: OptiEdge. OptiEdge provides a single
feed with no modification of the A/V stream (the DTH signal remains untouched). A fully compliant T2 stream, which may well only contain some of the DTH services because of available capacity, can now be easily created in a deterministic manner at transmitter site level. This is also single and multiple PLP-compliant. This delivers a huge range of
OpEx and CapEx benefits. Examples include the fact that DTT operators are now able to cost-effectively use a satellite network to reach customers in
Opinion
Regis Le Roux: ‘Exactly the same down to the last byte’
more remote areas to compliment DTT services. Alternatively, it means that separate DTT and DTH network operators can share the costs of satellite links and headend infrastructure. Crucially, Enensys’ solution
is fully compliant with SFN (Single Frequency Networks)
Lenses are put to the test Cooke Optics
By David Fox Cooke has introduced a new Metrology range ‘to raise industry standards’. Its first production model is a new lens
test projector that is designed for today's fast lenses and is so bright that it can be demonstrated in daylight (although it is dimmable), making it much easier to discern flaws and artefacts in fast lenses. Many current projectors
cannot pass a beam correctly through lenses that are faster than T2.
It has an interchangeable lens mount to work with any lens and can be used to check lens performance, match lenses, and set the lens up correctly before it goes out on a job.
There will also be a T-Stop Machine, “for measuring how accurate the T-stops on a lens are, to make sure it’s really a T2 and not a T2.4” said Les Zellan, chairman and owner, Cooke Optics. It will also work with any brand of lens. 11.D10
Measure for measure: The Cooke Metrology Lens Test Projector
used in DVB-T2 deployments to allow multiple transmitters to use the same frequency in the same area to increase signal robustness. This means that the streams must all be exactly the same down to the last byte, which OptiEdge makes possible. 2.A17
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