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Audio For PBS BROADCAST. Lip Sync. Errors Can Hide Below Threshold. WGBH Public Television Quality Workshop. Scenario #1 Show: -1 frame, looks OK Station: -1 frame, looks OK Broadcast Show: -2 frames, looks bad Solution: All sync must be correct (not just look it). Errors Can Cancel.

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Presentation Transcript


Errors can hide below threshold
Errors Can Hide Below Threshold

WGBH Public Television Quality Workshop

  • Scenario #1

    • Show: -1 frame, looks OK

    • Station: -1 frame, looks OK

    • Broadcast Show: -2 frames, looks bad

  • Solution: All sync must becorrect (not just look it)


Errors can cancel
Errors Can Cancel

WGBH Public Television Quality Workshop

  • Scenario #2

    • Show: -3 frames

    • Station: +3 frames

    • Broadcast Show: 0 frames, looks good

    • But two wrongs don’t make a right!

    • Good shows will look bad on this station!

  • Solution: All sync must becorrect


Errors can drift
Errors Can Drift

WGBH Public Television Quality Workshop

  • Scenario #3

    • Broadcast Now: Good

    • Broadcast Later: Bad

  • Solution: Be Careful! Change Channels!

  • Millions of commercial and consumer MPEG decoders drift!


Error perception can drift
Error Perception Can Drift

WGBH Public Television Quality Workshop

  • Scenario #4

    • Sync Now: looks good

    • Same Sync Later: looks bad

  • Solution: Patience

    • Need tight shots of people talking

    • Some people talk out of sync!

    • Stare at sync long enough, you will start seeing things!


Production tips
Production Tips

WGBH Public Television Quality Workshop

  • Delay audio with every video delay

    • Framesyncs

    • Switcher effects

    • LCD & Plasma Displays!

    • Don’t trust your ears

    • TEST!


Station tips
Station Tips

WGBH Public Television Quality Workshop

  • Align sync at every point

    • Framesyncs & processors

    • MPEG & ATSC encoder settings

    • Surprises

    • Don’t trust your ears

    • TEST!


Test tools
Test Tools

WGBH Public Television Quality Workshop

  • Edit Suites and QC Stations

    • syncheck.com

  • TV Stations

    • ID with 1 frame dot and beep, then non-linear editor

    • Normal programming with Miranda or Evertz solutions


Consumer tips
Consumer Tips

WGBH Public Television Quality Workshop

  • LCD & Plasma TV's

    • Internal decoder should be OK

    • Separate decoder & audio systems require offset!

  • MPEG decoders

    • Try changing channels



Industry progress
Industry Progress

  • Early Confusion

  • Subsequent Conflict & Loudness Wars

  • Recent Consensus: ATSC A85!

    • www.atsc.org/cms/standards/a_85-2009.pdf

WGBH Public Television Quality Workshop


Production tips1
Production Tips

WGBH Public Television Quality Workshop

  • Buy an LKFS meter (BS.1770)

    • Your mix engineers will like it!

  • No money?

    • Dialog peaks at -10 dBFS works pretty well

  • Produce content to -24 LKFS

    • Average over entire show, ± 2 dB

    • Dramatic moments can still be ±10 dB!


Station tips1
Station Tips

WGBH Public Television Quality Workshop

Set plant for unity gain

Set encoder dialnorm to -24

Get an LKFS meter (BS.1770)

Measure day-long compliance with -24 LKFS

Apply processing if needed

Compare local stations and share




5 1 surround1
5.1 Surround

  • PBS Submission Requirement

    • Effective March 2011!

    • Up-mix OR actual 5.1 production

    • Requires Dolby E

  • Caution

    • Calibrate your LFE monitoring per ATSC A85

    • Insure downmix is compatible

    • Most stations cannot afford to broadcast 5.1

WGBH Public Television Quality Workshop


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