O OFCOM anunciou nos últimos dias algumas propostas para melhorar a qualidade da TV digital terrestre no Reino Unido. A tecnologia prevista permitirá a oferta de novos serviços aos cidadãos e também de canais em alta definição em Freeview já em 2009, sem o uso adicional do espectro radioeléctrico. De acordo com o OFCOM:
“Recent advances in broadcasting technologies and standards make the upgrade possible. This includes:
- Switchover capacity: Digital television switchover will allow a change in technical broadcast standards which will increase the capacity of DTT by around 20 per cent. This is called mode change.
- Efficiency improvements: Requiring broadcasters to make the most efficient use of current broadcast standards.
- Coding: This is a technology that turns pictures and sound into material that can be broadcast digitally. The latest coding standard, called MPEG4, is expected to be up to twice as efficient as the current MPEG2 standard.
- Transmission: A new European transmission standard, called DVB-T2, will increase capacity by at least 30 per cent.
Taken together, these advances in technology could in time more than double the capacity of DTT to enable extra television channels, including those using high definition technologies.
Multiplex reorganisation
Terrestrial television is broadcast on six multiplexes. These are distinct blocks of transmission capacity which carry television channels. Ofcom proposes to clear one of the three multiplexes used for Public Service Broadcasting (Multiplex B, licensed by Ofcom to BBC Free to View Ltd). The existing channels on this multiplex would be relocated to use the spare capacity on the other multiplexes. Once this is complete, Multiplex B would be upgraded to use new technologies and standards.
Consumer choice
The DTT upgrade would bring more choice to consumers.
Viewers who wanted to access the new services on offer would need to buy a new DTT set-top box or integrated television, which was compatible with MPEG4 and DVB-T2.
However, viewers with existing DTT set-top boxes or integrated televisions would still be able to access Freeview services with their current equipment.
Delivering new services
As this capacity has been designated for public service broadcasting, Ofcom proposes to invite organisations with Public Service Broadcaster status – principally the BBC, the Channel 3, 4 and 5 licensees and S4C – to set out how they would use the upgraded capacity on Multiplex B.
Throughout this process, Ofcom’s responsibility will be to further the interests of citizens and consumers and we welcome the contributions of all those with an interest in the future of broadcasting in the UK.
Proposals would be judged on three main criteria: efficiency of spectrum use; contribution to public service broadcasting; and contribution to the range and diversity of television services available on DTT.”
Consulte aqui informações detalhadas das propostas.
Agradeço ao Dr. Luís Neto Galvão que, gentilmente, me enviou esta notícia.
