Lip Sync

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Lip Sync
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Lip Sync

• Rick Ackermans Turner Broadcasting
• Stan Chayka Sigma Electronics
• Mark Wasden Direct TV
• James Hopkins Fox Broadcasting
• Steve Lyman Dolby Labs
• Patrick Waddell Harmonic

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Turner Entertainment Networks Network
Operations A Time Warner Company
Merrick Ackermans - Director of Engineering
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The Difficulties of Maintaining Lip Sync in Live
HD/SD Broadcasts.
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As Everyone Knows

• Maintaining Lip Sync is Easy.
• You just send the audio with the video.

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Once Upon a Time

• The world was analog.
• To make the audio and video out of time you
  really had to work at it
• and probably spend a great deal of money.

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Once Upon a Time

• The only real enemy was the speed of light (or
  electrons in this case).
• 186,282 miles per sec.
• 299,792 KM per second.
  (for the benefit everyone from the rest of the
  world.)

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Once Upon a Time

• At 30 fps this equaled 6209 Miles per frame.
• As long as everything stayed on the ground you
  really couldnt mess up lip sync.

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Then One Day

• We took our first steps into having to deal with
  lip sync when.

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Satellites

• With satellites we had to start making sure that
  the audio and the video was taking comparable
  paths.

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Satellites
Uplink
Downlink
Video Audio
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What Could Make Things Worse

• DIGITAL

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What Could Make Things Worse

• Frame Syncs
• Digital Video Effects (DVE)

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More Latency to Come

• Video and Audio Compression.
• HDTV
• Mixed HD/SD Events with separate feeds.

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Satellites
Uplink
Downlink
HD Video Dolby E SD (or 4x3 safe) 2 Ch Audio
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Incoming Live Feeds
HD Signal
SD Signal
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Typical Distribution and Emission Routing
Remote Site (OB)
Network
Broadcast Affiliate
CATV/DBS Telco
Viewer
Video Audio
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Up to this point

• All testing has been Out of Service Testing
• In Service Testing.

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In Service Testing
Source Material
CATV/DBS Telco
Master Control
Satellite Return
DBS Satellite
In Service Lip Sync Comparison
Video Audio
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Typical Distribution and Emission Routing
Remote Site (OB)
Network
Broadcast Affiliate
CATV/DBS Telco
Viewer
Video Audio
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Lip Sync
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Lip Sync

• Rick Ackermans Turner Broadcasting
• Stan Chayka Sigma Electronics
• Mark Wasden Direct TV
• James Hopkins Fox Broadcasting
• Steve Lyman Dolby Labs
• Patrick Waddell Harmonic

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