Welcome T’ Frozen North
Posted by: Rowan in BBC R&D Manchester, tags: BBC, Manchester, R&D, Tech, Work
Manchester greeted me yesterday with howling winds and a few brief showers. Not the best of starts weather-wise after the glorious sunshine that bathed London last week. However I’m now sitting in the Research & Development office of the BBC’s New Broadcasting House in Manchester, getting settled in. How I came to be here was somewhat of an interesting story, and I explained a little here. But what I’m doing over the next 6 months will be even more interesting, and it’s a journey I hope some of you might like to join me on. We have the task of establishing a new Research & Development lab in Manchester ahead of the BBC’s move to Salford Quays. Setting up a new broadcast and media research lab isn’t something that happens often, so just how we go about it will be full of creative and technical challenges.
Well, today is my last official day working on BBC HD audio. Somehow I don’t think this project will leave me alone just yet, but after a week’s leave, my main focus will be elsewhere. So I thought I’d take the opportunity to talk about something which has consumed a fair bit of my time, but which I haven’t blogged much about: metadata. For the uninitiated, metadata is “data about data”. A photo’s metadata for example might tell you what camera it was taken with, where it was taken, what exposure was used and so on. In the case of BBC HD’s audio, metadata is carried by the Dolby E and Dolby Digital streams we use, and has two main functions: it describes the audio being carried, and it controls the decoders in your homes. One parameter, often called dialnorm (for Dialogue Normalisation), tells your decoder how loud the programme is, so that it can attempt to smoothe out differences between programmes and channels to give you a more consistent loudness. Another set of parameters control what happens when your decoder downmixes the audio, meaning when it produces a stereo mix for your stereo speakers from the surround sound we may be sending. It’s important stuff, so we have to make sure that metadata survives our distribution chain, and sometimes we even have to add metadata to a programme automatically, which can be tricky. Here’s some of the work we’ve done…
The percentage of my friends who have an iPhone is quite frankly incredible. So when we get together, once we’ve caught up on our latest news and got through a pint or two, the question inevitably arises, have you got any good new apps? Similarly when chatting to someone new who turns out to have an iPhone, the same kind of question pops up. The App Store is like a little club that we all joined, and sharing recommendations about the best downloads is a new game. So as to further ruin my conversation possibilities with my friends (
It’s been a long time since I’ve updated you, for which I apologise. However the good news is this will hopefully be my last post about lipsync issues on BBC HD. That’s in part because I’m really running out of bad puns based on the word ’sync’, but mostly because – and I realise I’m tempting fate here – we may have got to the bottom of it all. Let me elabourate…
