S34: Applications and
Presentation Layer
Madeleine Noland,
S34 Chairman
LGE
S34 Organization
S34-1 – Video
S34
S34-2 – Audio
S34-3 – Conceptual Models
S34-4 – Interactivity Runtime Environment
S34-5 – Accessibility
S34-3 – Conceptual Models
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Conceptual Models flesh out requirements developed by S31
– Additional input was solicited to clarify requirements as needed
Goal is to provide detailed input to guide detail/technical work in
other SGs and AHGs
Documents include:
– Service Conceptual Model
– Advanced Emergency Alerting Framework
– Personalization Conceptual Models
• Rendering/Accessibility Preferences
• Targeting/Demographics
– Service Usage Reporting Model
– Companion Device Model
S34-3 – Service Conceptual Model
• Service Conceptual Model addresses the
following questions
– What is a Service?
– What kinds of Services are possible?
– What is a Service composed of?
– How does it all go together?
S34-3 – SCM: Types of Services
• Enhanced linear services
– Multiple, alternative components, apps and more
• OnDemand services
• Interactive Applications
– As enhancements to A/V services
– As stand-alone application services
• Audio-only services
S34-3 – SCM: Service Components
• Audio, video, captions, applications
• Multiple alternative components
– Select one (e.g., choose an audio track)
– Select more than one (e.g., main view & PiP)
– May be user selectable (e.g., choose CC track)
– May be auto-selectable (e.g., receiver chooses
the one it’s capable of rendering)
S34-3 – SCM: Hybrid Delivery
• Broadcast-only services
– All signaling and components delivered by terrestrial
broadcast
• Hybrid services: Broadcast+broadband
– Some components/signaling delivered by broadcast and
others by broadband, combined and synced at receiver
• Broadband hand-off capability
– E.g., to support temporary loss of RF reception
– All signaling and components temporarily delivered by
broadband
Note: pure OTT (i.e., no connection with or origination from broadcast) is out of scope of ATSC.
S34-3 – SCM: Programs & Interstials
• Temporal divisons of a linear service or on-demand
session
• Program: specific airing of a Show including any
interstitials
• Show: The “main event” of a Program
• Segments: portions of a Show airing in a Program,
typically separated by interstitials
• Interstitials: ads, promos, pledge drives, etc.
Flexible Service Model - Components
Components
Interactive App
App
App
Closed Captions 2
Closed Captions
CC
CC
CC
Audio 2
Audio
Audio
Audio
Audio
Video 2
Video
Video
Video
Program (time)
Video
Hybrid
broadcast/broadband
delivery is possible
And components can
be dynamically
selected and combined
at the receiver.
Video
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Enhanced HD
UHD is a key goal of ATSC 3.0
Targeting small screens (HD) and big screens (UHD)
High efficiency compression – all proposals use HEVC
Multiple, selectable video components
3D support
Wide Color Gamut, HDR and Scalable Coding in
consideration
• Lots more on Video in the afternoon sessions
Video
• Resolutions of up to 3840 × 2160
– Exact matrix of formats under discussion
• General agreement on progressive only for UHD resolution
• Frame rates of 24, 30 and 60Hz (integer & fractional)
– Plus 25Hz and 50Hz for international compatibility (integer)
– 120Hz in discussion (integer & fractional)
• High dynamic range and wide color gamut are in active discussion
and anticipated to be included
• SHVC (scalable video) being tested to compare with simulcasting
• Aspects of legacy support are in discussion, including SD
• Closed Captions work has been separated from video work
Audio – Immersive
• High spatial resolution in sound source
localization in azimuth, elevation, and
distance
• Increased sense of sound envelopment
• Targeted to various devices (fixed, mobile)
• Targeted to various speaker set-ups and
headphones
• Lots more on Audio in the afternoon sessions
Audio - Personalization
• Selectable, mixable audio components
• Control of dialog
– hearing impaired can raise dialog level
• Alternate audio tracks
– alternate language tracks
– special commentary and music and effects
• Normalization of loudness, contouring dynamic range
– based on capabilities of the device and environment
Audio – Progress
• Call for Proposals was issued
– The CfP included details of testing and evaluation for
sound quality, codec efficiency and personalization
features
• Two proposals currently under consideration:
– Dolby
– MPEG-H Alliance (Fraunhofer, Technicolor, Qualcomm)
• Proponents participating in tests as stipulated in the CfP
• Full test results expected by late summer
Interactivity
• Robust App Runtime Environment with HTML5 support
• Based on HbbTV 2.0 with restrictions and extensions
– HbbTV 2.0 was published earlier this year
– 20+ extensions being documented, several based on
ATSC: A/105 (aka “ATSC 2.0”), now in Candidate
Standard phase
– Changes being documented due to ATSC 3.0 IP
delivery solution (HbbTV is based on MPEG-2 TS)
• Lots more to come on Interactivity in the afternoon
sessions
Interactivity – Profiles
• Working with CEA to bundle features into “profiles”
– One or more “Universal Profile(s)” are desired
– Advanced Profile(s) and/or Add-on Features are in
discussion
• Goal is to promote adoption and use by app developers
– E.g., knowing which interactive features are
supported in all devices vs. some devices
• Goal is to simplify receiver implementations
– E.g., profiles could require fewer test vectors than
“mix & match” implementations
Interactivity – a few sample uses
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Targeted ad insertion
On demand content launcher
Flexible use of display real estate,
aka “screen mash-up”
– PiP, tickers, graphics, etc.
T-commerce
Voting and polling
Games
News and sports feeds
Notifications and reminders
The list goes on…
Accessibility
• Generally agreed closed captions can be its own
essence
• Recent decision to move closed captions work out of
video group and into newly formed Accessibility group
• Initial focus: refine closed
caption requirements
• Contributions will likely be
solicited soon
• Again, more on this in the
afternoon
[email protected]
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ATSC 3.0
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