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Audio description : making it work. Nick Tanton BBC. Synopsis. Authoring Playout Coding Receivers End-to-end. 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

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Audio description : making it work

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Audio description making it work

Audio description :making it work

Nick Tanton

BBC


Synopsis

Synopsis

  • Authoring

  • Playout

  • Coding

  • Receivers

  • End-to-end


Bbc involvement

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


Bbc activity now

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


Authoring 1

Authoring 1

1998


Authoring 2

Authoring 2

1999


Authoring 3

Authoring 3

2008


Authoring 4

Authoring 4


Authoring 5

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


Playout

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.


Coding

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.


Receivers 1

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


Receivers 2

Receivers 2

Remote controls

  • Easy-to-use remote controls are important for everyone(especially the blind and partially sighted)

DedicatedAD & ST buttons


Receivers 3

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


End to end e2e

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.


Thanks for your attention nick tanton@bbc co uk

Thanks for your attentionnick.tanton@bbc.co.uk

End-to-end 2


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