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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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Presentation Transcript
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 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.

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