Feeds

Ofcom plots out wireless mic future

Redefine and reduce, then turn digital

Designing a Defense for Mobile Applications

Last month, ITV sold off its 70 per cent share of JFMG, the organisation that manages spectrum used for programme making and special events. But at the same time, Ofcom published research into the future of PMSE, concerned largely with how to get rid of it.

PMSE users currently lurk between the analogue TV channels, supplying connectivity for wireless microphones used in everything from West End shows to the Big Brother house, but with analogue TV about to be switched off, Ofcom is under pressure to find somewhere else for the wireless mics to go, though the regulator would much prefer to wield the magic wand of technical progress and simply make the problem disappear.

Ofcom has already said that after the digital switch off, there will be a band-manager for 854-865MHz, able to sub-let the spectrum to theatre-sound companies and businesses, and it's likely that Arqiva (who now own 100 per cent of JFMG) will be wanting to fill that role. But the band manager will have to pay the market rate, calculated using AIP, and pass on those costs to the spectrum users. Considering that a touring show might already be paying £900 a week for radio licences, any increase is being eyed suspiciously by the industry.

And that is less spectrum than the industry is using now, which is what prompts Ofcom's latest analysis of the future of PMSE. The report (pdf), carried out by Cambridge Strategic Management Group, examines all the technologies, techniques. and processes that might make the PMSE requirements less onerous: to Ofcom at least.

The first thing the report does is split PMSE requirements between professional and amateur or casual users, with everyone except the professionals being pushed into unlicensed spectrum such as 2.4GHz or higher. That leaves the professionals, who can't afford a millisecond of interference or signal degradation.

While Ofcom is clearly hoping that magic technology will make the problem vanish, the report is slightly less optimistic. Technologies such as Ultra Wideband and Cognitive Radios are put into a 10-year timescale. An optimistic estimate. But that's only to be expected given that it was supplied by the equipment manufacturers.

Digital microphones offer one path to squeezing more use into the available bandwidth, but those have generally rejected by the theatre community for three reasons: they are too expensive, the latency involved in compressing and uncompressing the audio is unacceptable, and the signal drops out suddenly rather than gracefully failing as an analogue rig will.

But this is one area where technology is progressing, and Orbital Sound are already using 32 digital microphones in the production of Carousel currently playing at the Savoy Theatre in London's West End. These microphones have a latency of 1.9ms, which sneaks under the 2ms considered acceptable (engineers generally muck about with the latency anyway, to allow for "imaging", but 2ms gives them enough room to play with the sound). Orbital reckon they can2 fit around twice as many radio mics into the same spectrum by going digital, which is a start.

Belfast-based APT reckon they can get 4 or 8 microphones into the same space as one analogue one, with the same 1.9ms latency and no observable loss of quality. That's a step too far for the industry right now - though with licensees including Shure, the technology will no-doubt be more widely adopted.

But squeezing a few more microphones into a reduced space isn't going to solve the PMSE problems, and neither is redefining a proportion as non-critical users who can shift in to more error-prone technologies or frequencies. Charging AIP fits with Ofcom's ideal that those who pay most will make greatest use of spectrum. But it doesn't address the luvvies problem that much of the money they generate isn't going in to their pockets, and while the new report tries to find ways around the problem ultimately it's just a list of technologies that might deal with the problem in a decade or two, when what's needed is a solution for the next year or two. ®

Securing Web Applications Made Simple and Scalable

More from The Register

next story
Google Nest, ARM, Samsung pull out Thread to strangle ZigBee
But there's a flaw in Google's IP-based IoT system
Orange spent weekend spamming customers with TXTs
Zero, not infinity, is the Magic Number customers want
Want to beat Verizon's slow Netflix? Get a VPN
Exec finds stream speed climbs when smuggled out
US freemium mobile network eyes up Europe
FreedomPop touts 'free' calls, texts and data
'Two-speed internet' storm turns FCC.gov into zero-speed website
Deadline for comments on net neutrality shake-up extended to Friday
GoTenna: How does this 'magic' work?
An ideal product if you believe the Earth is flat
NBN Co execs: No FTTN product until 2015
Faster? Not yet. Cheaper? No data
prev story

Whitepapers

Reducing security risks from open source software
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
Consolidation: The Foundation for IT Business Transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.
Application security programs and practises
Follow a few strategies and your organization can gain the full benefits of open source and the cloud without compromising the security of your applications.
Boost IT visibility and business value
How building a great service catalog relieves pressure points and demonstrates the value of IT service management.
Consolidation: the foundation for IT and business transformation
In this whitepaper learn how effective consolidation of IT and business resources can enable multiple, meaningful business benefits.