Insights in DVB-T
Content
1. Introduction
• Historical background
• Objectives of Digital TV
• What is DVB ?
2. The Technology
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Why Digital ?
How DVB-T works
What I have to expect ?
What I need
The Roadmap
Introduction
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Historical background
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Japan is using MUSE
1991 first Discussions in Germany
European DVB-Project founded in 1993
At the same Time MPEG works on Encoding Std.
DVB-Project decides to use MPEG-2
Today: 300 Organisations from 37 Lands
• Common Carrier
• Manufacturers
• Broadcast Stations
• Authorities
Introduction
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Objectives of Digital-TV
• Primary Objectives like HDTV changed
• Now:
• Multiplication of programs which can be sent
over a transmission line.
• DTVB enables Audio transmissions
• DTVB enables flexible choice of Quality
• Encryption can be used for Pay-Services
• DTVB can be used as Data Transfer Method
Introduction
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What is DVB ?
• Describes Digital Video Broadcasting Standards
• Most used Standard for Digital Television
• Standards like (in this order):
• DVB-S for Satellite Transmissions
• DVB-C for Cable Transmissions
• DVB-T for Terrestrial Transmissions
The Technology
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Why Digital ?
• Digital Technology‘s displace Analog
• Analog Receiving is rarely "Perfect"
• Interferences
• Mountains
• Buildings
• Forrest’s
• other Emitters
• Few Programs
• DVB-T uses COFDM
• Informations divided on many Frequencies
• Along-sent Error Corrections
• Common Frequency Broadcasting
The Technology
The Technology
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How DVB works
• Playout-Centers sent Data Containers
• Data Containers with different size
• DVB-S and DVB-C  ~ 40 Mbit/s
• DVB-T  ~ 15 Mbit/s
The Technology
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How DVB works
• MPEG-2 describes Multiplexing too
• Audio, Video, Add-on Datas
The Technology
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What I have to expect ?
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You can use very small Antennas
You can watch TV in your Car
Enough Signal Power  nearly perfect Picture
Less Signal Power
 a black Screen
Regardless…
• not necessarily a better Picture
• Some Stations use old Encoders
• Rarely a Dolby-Digital Soundtrack
The Technology
DVB-S
Analog
The Technology
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What I need
• A new Set-Top-Box for each Device
…paid by yourself
• DVB-C Receivers can NOT be used !
• A Dolby Digital Receiver if you wish
• That‘s all ;)
The Technology
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The Roadmap of DVB-T
• 4. November 2004 successfully adapted
in Berlin-Brandenburg
• 2004
• Hannover/Braunschweig: 24. Mai 2004
• Bremen/Unterweser: 24. Mai 2004
• Köln/Bonn: 24. Mai 2004
• Hamburg/Lübeck: 8. November
• Kiel: 8. November
• Düsseldorf/Ruhrgebiet: 8. November
The Technology
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The Roadmap of DVB-T
• 2005
• Halle/Leipzig
• Erfurt/Weimar
• Mainz/Wiesbaden/Frankfurt
• Ludwigshafen/Mannheim
• Stuttgart
• Nürnberg
• München
• 2010 Everywhere in Germany
My Opinion
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Generally
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Quite a good thing
Advantages like EPG and much more Programs
But there are no reasons to wait…
You can use DVB-S instead
In Future
• Interactive Contents (Backchannel required)
• Eventuelly HDTV
In the End…
…thanks for your attention !
5. References
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Literature
• Digitale Fernsehtechnik – Datenkompression und
Übertragung für DVBInternet
from Ulrich Reimers (Springer Publishing)
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Internet
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www.dvb.org
www.ueberall-tv.org
and www.google.de - www.heise.de of course
dict.leo.org ;)
Questions ?