From Digital TV to Digital Convergence
從數位電視到數位匯流
官振鵬
curtis.kuan@gmail.com
2010年 民生電子論壇
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Who I am
官振鵬
工研院資通所
交通大學電機與控制系博士
研究興趣
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–
–
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Intelligent Robotics
Virtual Reality
Video Processing
DTV Systems
Digital Rights Management
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Outlines
What is Digital TV
Evolution of Specifications
What is Convergence
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Digital TV
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Broadcast Networks for DTV
Head-End
Networks
DVB-S
Receiver
Satellite
Contents/Services
Applications
Terrestrial
DVB-T/H
DAB
DVB-C
IPTV
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Cable
HFC
xDSL
IP Ethernet
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Components of DTV System
Content Preparation
and Compression
Content Storage and Delivery
Content Consumption
Conditional
Access System
Modulator
Network
Management
Content
Database
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Content
Distribution System
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Why Do We Need Digital TV?
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Components of Digital Television System
Baseband Processing
– Video & Audio compression – HE-AAC, H.264, VC-1, …
– Teletext, Subtitling, Service Information, Application
Signal Transmission and Reception
– Multiplexing, Channel Coding
– Various Modulations due to Different Media
COFDM – DVB-T; QAM – DVB-C; QPSK – DVB-S; VSB – ATSC
Conditional Access
– Control Access, Guarantee Revenue, Parental Control, Copyright
Protection
Interactive Services
– Attractive Services, Return Channel/Path
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Worldwide DTV Standards
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Terrestrial
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Cable
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Satellite
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DTV Standards
ATSC – Advanced Television Systems Committee
DVB – Digital Video Broadcasting
ISDB – Integrated Services Digital Broadcasting
DMB-T/H – Digital Media Broadcasting-Terrestrial/Handheld
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ATSC
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Introduction to ATSC – Advanced Television Systems Committee
Formed in 1982
Member organizations of the Joint Committee on
InterSociety Coordination (JCIC): EIA, IEEE, NAB, NCTA,
SMPTE
Members representing the broadcast, broadcast equipment,
motion picture, consumer electronics, computer, cable,
satellite, and semiconductor industries
ATSC Digital TV Standards include digital high definition
television (HDTV), standard definition television (SDTV),
data broadcasting, multi-channel surround-sound audio, and
satellite direct-to-home broadcasting
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ATSC 8VSB
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ATSC Standards (selected)
ATSC Standard A/52A – Digital Audio Compression (AC-3)
Standard, Rev. A
ATSC Recommended Practice A/54A – Guide to the Use of
the ATSC Digital Television Standard
ATSC Standard A/65B – Program and System Information
Protocol for Terrestrial Broadcast and Cable, Rev. B
ATSC Standard A/68 – PSIP Standard for Taiwan
ATSC Standard A/70 – Conditional Access System for
Terrestrial Broadcast with Amendment
ATSC Standard A/96 – ATSC Interaction Channel Protocols
ATSC Standard A/100 – DTV Application Software
Environment - Level 1 (DASE-1)
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DVB
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Introduction to DVB – Digital Video Broadcasting
An industry-led consortium of broadcasters, manufacturers,
network operators, software developers, regulatory bodies
and others in over 40 countries committed to designing
global standards for the delivery of digital television and data
services
Open, Interoperable, Flexible, Market-led
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DVB-T COFDM
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DVB Standards (selected)
TR 101 154 V1.4.1 – Implementation guidelines for the use
of MPEG-2 Systems, Video and Audio in satellite, cable and
terrestrial broadcasting applications
EN 300 468 V1.4.1 – Specification for Service Information
(SI) in DVB systems
TS 101 812 V1.2.1 – Digital Video Broadcasting (DVB)
Multimedia Home Platform (MHP)
TR 101 290 V1.2.1 – Measurement guidelines for DVB
systems
TR 102 033 V1.1.1 – Architectural Framework for the
Delivery of DVB Services over IP-based Networks
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DMB-T/H
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DMB-T/H
China DTV standard
Developed by 北京清華大學 and 上海交通大學
– Combination of multi-carrier and single-carrier technologies
It still remains unclear
– All of China's DTVs —fixed and mobile— shall support both the TDSOFDM and VSB schemes
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Evolution of Specifications
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DVB started with the
aim of delivering DTV
services to the home
via satellite, cable &
terrestrial networks.
The consumer was (and
is) also served by fixed
and wireless telecom
networks.
Fixed
Telecom
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Broadcast
DVB also needed to
enable interactive
television. Thus the
MHP middleware
specification was
developed.
Further enabling iTV
was the development
of return channel
specifications using the
telecom networks as
well as satellite, cable
and terrestrial
networks.
Wireless
Telecom
source: www.dvb.org
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DVB 2.0
Broadcast
DVB in IP
IP in DVB
In 2002, the DVB
Project launched a new
work programme: DVB
2.0 – looking at the
delivery of broadcast
services over nontraditional networks.
DVB →
GSM/UMTS...
Fixed
Telecom
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Wireless
Telecom
source: www.dvb.org
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DVB 3.0
Broadcast
DVB in IP
IP in DVB
Late in 2004 DVB agreed
on a new work
programme for the
future – DVB 3.0
HDTV, HN, CPCM,
CBMS, …
DVB →
GSM/UMTS...
CBMS
Fixed
Telecom
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Wireless
Telecom
source: www.dvb.org
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Areas of Strategic Importance for DVB 3.0
Convergence of broadcast and mobile services
– WiFi, WiMax, LTE
– 2 G, 3 G, B3G, 4G
Convergence of broadcast and IP fixed network services
Solutions to support service interoperability across multiple
networks and platforms
– Content coding
– Middleware
– Content protection and copy management
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In DTV world, no more Programs but
Services!
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Services
Interactive TV Services
 Personalized news
 Home networks
 Push applications
 Software distributions
 Pay-per-view, video-on-demand
 Distance learning
 Alerts for schedules, programs, emergency
 Enhanced broadcast with embedded
information, data
 Electronic coupons
 Electronic newspapers and magazines
 Secondary audio channel
 Home banking, financial transactions
 Personalized content
 Hidden data channels
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 Impulse buying
 Streaming data services
 Usage statistics
 Electronic program guide
 Web browsing
 Sports status and scores
 Stock ticker
 Animation overlay
 Games, tournaments
 Messaging and email
 Polls
 Interactive stories
 GUI look and feel
 Presentation styles
 Home control and security
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Application Synchronized to TV content
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Airport Information System
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Stock Information and Java Games
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MHP Services
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Convergence
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Convergence?
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Real Scenario
Who use this service – We, ourselves, everybody, human
beings
Why – Convenient life – Always connecting and connected
Where we use – No matter where we are – Steady, moving,
in-door, out-door, ...
When we apply – 24 hours a day, 365 days a year, every
second
What we consume – Contents with diversity – Shopping
service, entertainment, information, communications, ...
How we can – Consumers don’t care, that’s your problem
– That’s why I got a job
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Digital Convergence
Convergence really means the freedom for consumers to use any
service under any circumstances they choose to
Convergence in Contents and Services
– Same contents/services can be delivered to different receiving devices via
various IP networks
– Formats of contents/services are regulated by standards
Convergence in Receiving Devices with the same APIs
– Various receiving devices can execute the same application with the same
middleware APIs
– APIs are defined as global standards
Convergence in using the same electronic components
– Memories, Microprocessors, Middlewares
Convergence in IP networks
– No matter what physical access networks: xDSL, FTTH, 3G/4G, DVB-T/H/T2,
digital cable, satellite, WLAN, WiMax, LTE, …
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Digital Convergence: a whole new way of life
Digital convergence is increasing the importance of content
and services in the ICT sector. For example, television over
IP, (fixed and wireless) is already one of the most successful
triple-play and 3G services.
The digital future is interactive.
Digital life in media and services is therefore not just about
gadgets but about a whole new way of life.
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Convergence in NGN (Next Generation Networks)
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OMA BCAST Convergence
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ITU-T Convergence
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Real Example of Digital Convergence
HbbTV – Hybrid Broadcast Broadband TV
– A pan-European specification for interactive TV applications for
television
– Based on existing standards & Web technologies
– Provides seamless TV experience across broadcast and broadband
– Specification independent from the transmission medium (DVB-T,
DVB-S, DVB-C)
– IP connection recommended
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HbbTV Specifications
OIPF
–
–
–
JavaScript APIs for TV environment (e.g. tuning,
now/next info, PVR, …)
Media formats
Modifications to CE-HTML
HbbTV
specification
CEA
–
–
–
JavaScript APIs for on-demand media
Subset of W3C specifications & image formats
Remote control support (e.g. key events, spatial
navigation)
subset
DVB
–
–
–
profiles
Application signaling
Application transport via DVB (DSM-CC object
carousel)
Stream events
CEA-2014
(CE-HTML)
Declarative
Application
Environment
DVB Blue Book
A137
extensions
W3C
–
–
–
–
–
Audio and
Video
formats
XHTML
CSS 2.1, CSS-TV
DOM-2 (including XML Document support)
ECMAScript
XMLHTTPRequest
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W3C
Specifications
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HbbTV Seamless TV Experience
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HbbTV Applications
Balanced model to support broadcaster and manufacturer
interests
– Broadcast applications
– Broadcast independent applications
– Portal applications
Example targeted application types
– “Red Button” applications
Enhanced TV, interactive ads, voting, betting, etc.
– Digital text
Replacement for traditional teletext services
– Broadcast-independent applications
Accessed from broadcaster’s application or manufacturer’s portal
Catch-up (on-demand) TV, games, photo sharing, etc.
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HbbTV Applications
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Thank You~
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References
www.dvb.org
www.openmobilealliance.org
www.itu.int
www.hbbtv.org
www.google.com
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