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Audio description : making it work

This comprehensive overview details the BBC's commitment to Audio Description (AD) since the early '90s. From defining signal formats to proactive participation in standardization, Nick Tanton discusses the evolution and implementation of AD across digital platforms. The BBC has ensured that over 11% of its programming features AD, providing essential support for blind and partially sighted users. The process involves collaborative authoring, meticulous encoding, and thoughtful receiver design, underscoring the importance of a seamless experience for all viewers.

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Audio description : making it work

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  1. Audio description :making it work Nick Tanton BBC

  2. Synopsis • Authoring • Playout • Coding • Receivers • End-to-end

  3. BBC involvement • working on AD since early 90’s • working on AD for DTV since 1997 • defined signal formats in 1998 • broadcasting on DTT since 1999 • regular service since 2000 • provided technical support to manufacturers and other broadcasters • pro-active participation in standardisation

  4. BBC activity now • AD on over 11% of programmes (Q1-Q3 2007) for all relevant BBC public service digital TV channels • AD on our HD service • UK Digital Switchover Help Scheme • Authoring and playout by RedBEE • Coding by Siemens

  5. Authoring 1 1998

  6. Authoring 2 1999

  7. Authoring 3 2008

  8. Authoring 4

  9. Authoring 5 • keep file format as flexible as possible • e.g. multiple WAV and ESEF • anticipate • archiving • re-edits and re-versioning • new delivery platforms and standards

  10. Playout • ensure that if you’ve scheduled AD • it gets played-out as scheduled, • correct AD is associated with video etc. before TX, • it is accurately labelled in the metadata included with the delivered signal, • you’ve kept an accurate as-delivered log.

  11. Coding • ensure • the signal gets transmitted as scheduled, • it is correctly signalled in the service information (SI), • you’re able to identify failures to deliver and rectify them as promptly as possible, • coders can identify and respond appropriately to errors in the incoming signal.

  12. Receivers 1 • ensure • clear and complete definition of expected receiver behaviour, • user-interface is appropriate for B&PS, • test and representative streams are available and used • thorough testing (preferably with some independent oversight) Beware regression

  13. Receivers 2 Remote controls • Easy-to-use remote controls are important for everyone(especially the blind and partially sighted) DedicatedAD & ST buttons

  14. Receivers 3 • Most manufacturers know what is involved in including AD with their product. • A number of manufacturers have product with AD (iDTVs and stbs) or are working on including it

  15. End-to-end (e2e ?) • ensure • everyone involved in the process of delivery understands how important AD is to the blind and partially sighted user, • monitoring is designed-in ab-initio (and for executive action not just for reporting), • the service requirements are paramount. A culture based solely on “service level agreements” & “key performance indicators” will almost certainly produce a poor user-experience.

  16. Thanks for your attentionnick.tanton@bbc.co.uk End-to-end 2

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