Different Technologies and Delivery Systems of Digital TV and Radio broadcasting
Mohsen GHOMMAM MALEK ( Chief Engineer, Office National de Telediffusion ONT, Tunisia)
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SUMMARY
1. Intoduction 2. Image formats & definitions 3. Broadcasting compression norms 4. Different delivery solutions for TV broadcasting 5. Different delivery solutions for Radio broadcasting 6. Conclusion
2 INTRODUCTION
There are many standards for image, compression, delivery systems, etc.. Most Next generations of digital TV standards are completed and can be launched in the future Let’s discover together the existing systems and the new ones and their applications
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2-IMAGE FORMATS & DEFINITIONS (1) Profiles HDTV, SDTV and Mobile TV (pixels/lines)
1920x1080 (16/9)
1280x720 (16/9)
720x(480/576) (4/3)
PMP
Typ. 320x240
Handset (LDTV) Vehicular SDTV HDTV 720p HDTV 1080p/1080i
Compared to Standard TV (SDTV) 4 times less bandwidth is required to display a TV image on a handset (LDTV) 3 to 6 times more bandwidth is required to display a High Definition image
4 3-BROADCASTING COMPRESSION NORMS MPEG2 used mainly in SDTV MPEG4 AVC can used for Mobile TV, standard TV and mainly HDTV: 50% of compression gain compared to MPEG2 Don’t forget MPEG4 SVC: enhancement of MPEG4 AVC and compatible with it (under study) Data rate needed and planned for different formats
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3-BROADCASTING COMPRESSION NORMS
Names of MPEG4 AVC /H264 ( History)
6 3-BROADCASTING COMPRESSION NORMS
Licence Fees for MPEG-4-AVC In 2003, MPEG-LA announced participation fees for over-the- air free to air broadcasts using MPEG-4 AVC: No royalties for markets of 100,000 or fewer households For markets of greater than 100,000 households, $10,000 per year per local market service.
BUT In 2008, there are two options for free to air broadcasters : one payment of $2,500 per encoder Payment of $10,000 each year for any number of encoders per legal entity. The less expensive option depends on the way the individual broadcaster operates
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4-Different delivery solutions for TV broadcasting
The main delivery solutions for TV broadcasting:
•Terrestrial •Satellite •Cable •IPTV •Mobile TV
8 4-1-Terrestrial TV broadcasting (1) The main digital standards are : • ATSC ( North America) • ISDB-T (Japan, Brazil) • DMB-T/H ( China) • DVB-T ( Europe)
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4-1-Terrestrial TV broadcasting (2) Comparison between main systems :
Japan (ISDB-T) (DVB-T) (ATSC) Japan EuropeEurope USUS OFDM OFDM 8-VSB QPSK-16QAM- 64QAM QPSK-16QAM- 64QAM 6 MHz 7/8 MHz 6 MHz 1405 / 5617 1705 / 6817 Number of carriers 1
Réception Mobile: Yes Reception Mobile: Yes Non移動体受信 considered
•ISDB-T : Diffusion numérique service intégré-terrestre 8-VSB: Bande latérale résiduelle 8 états
10 4-1-Terrestrial TV broadcasting (3) Main parameters of DVB-T : SFN MFN
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4-1-Terrestrial TV broadcasting (4) Reception modes :
12 4-1-Terrestrial TV broadcasting (5) Planning configurations/ Coverage :
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4-1-Terrestrial TV broadcasting (6)
The new generation DVB-T2 digital standard:
14 4-1-Terrestrial TV broadcasting (7)
DVB-T2 offers higher data rates than DVB-T at a given C/N:
Cases 1 2 3
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4-2-Satellite TV broadcasting (1)
The main digital TV standards are: • DVB-S using QPSK modulation (DTH) •2nd generation DVB-S2
16 4-2-Satellite TV broadcasting (2)
Features of DVB-S2:
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4-2-Satellite TV broadcasting (3)
DVB-S2: New modulation schemes:
18 4-3-Cable TV broadcasting
The main digital cable TV standards are: • DVB-C •2nd generation DVB-C2 Main features of DVB-C2 and the comparison with DVB-C
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4-4-IPTV broadcasting (1)
What’s IPTV? Comparison with WebTV
20 4-4-IPTV broadcasting (2)
•IPTV ARCHITECTURE •PROPRIEATARY SOLUTIONS
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4-4-IPTV broadcasting (3)
Comparison of IPTV over DSL with DVB-S and DVB-C
22 4-5-MOBILE TV broadcasting (1)
What do we mean by Mobile TV?
Handheld devices mobile phone
Portable devices with small antenna
In-car equipment
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4-5-MOBILE TV broadcasting (2)
Unicast/Broadcast solutions
Broadcast, DVB-H( DVB -H) Unicast MBMS
Mobile Network Mobile Network Mobile Network
Broadcast Network
Mobile TV User-controlled Multimedia services content to masses, personalized channels to masses and > 20 channels and interactivity communities
24 4-5-MOBILE TV broadcasting (3)
Delivery solutions - Comparaison
Streaming Broadcast
3G-MBMS T- DMB MediaFLO DVB-H DVB-SH/STiMi/S-DMB Terrestrial – Digital Digital Video Hybrid Mobile TV Solutions ‘Media Forward Link Digital Video Multimedia Broadcast to the Satellite/Terrestrial Only’ Streaming on 3G Broadcasting Handset’ Solution Terrestrial Satellite
Transmitter
3G Network Terrestrial Digital Terrestrial Satellite FLO Transmitter Repeater Transmitter TV Transmitter (with Gap fillers) Data Rate 384 Kbps 1.4 Mbps 11 Mbps 11 Mbps 27 Mbps BTX 2110 - 2170 VHF/L-BAND US 700 UHF Band from S-Band MHz MHz band 470 to 890 MHz (2.630~2.655 GHz)/ Frequency MTX 1920 - 1980 MHz (2.170-2.200 Ghz) Coverage(1Tx) Up to 2Km 22-40 Km Up to 25Km Up to 25Km Up to 50Km Trialed Commercial Partially Korea/Japan/China/Eur Primary Use Worldwide Korea/Europe US Europe ope/North America
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4-5-MOBILE TV broadcasting (4) Global Status
ISDB-T/CMMB commercial launch DMB commercial launch DMB commercial launch scheduled MediaFLO commercial launch DVB-H commercial launch DVB-H commercial launch scheduled for next 12 months DVB-H trial service
Source: Arthur D. Little, 2009
26 5-Different delivery solutions for Radio broadcasting (1)
ANALOGUE SYSTEMS
DIGITAL SYSTEMS
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5-Different delivery solutions for Radio broadcasting (2)
28 5-Different delivery solutions for Radio broadcasting (3) Main Digital radio families
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5-Different delivery solutions for Radio broadcasting (4) Digital radio multimedia features
30 5-Different delivery solutions for Radio broadcasting (4) DAB/DAB+/T-DMB in Europe
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5-Different delivery solutions for Radio broadcasting (4) Receiver profiles for Eureka 147
32 6-CONCLUSION (1)
•Everyone does not introduce new systems at the same time! There will inevitably be wide timescale difference, both for production and delivery
• New digital technology appears in ‘generations’, and there will always be a ‘next generation’ ahead. There will never be a ‘best forever’ system
• Digital Switchover: The transition to digital broadcasting should take place in the next years.
• IT programme production is inevitable
• High Definition Television: In five years, the only TV programme production equipment on the market may be HDTV.
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6-CONCLUSION (2)
• Internet TV via broadband may have as many viewers/users as broadcasting. Internet is becoming a ‘video based’ medium
• IPTV services, Broadcasting to handhelds, are usually based on subscription and/or pay service models. They all need programmes/content that people are willing to pay for. There are ‘substitutes’ available such as Pod casting. Their success is not certain but possible.
• Try to choose a standard as close as you can to the service date.
34 ا Thank you for listening. Merci pour votre attention.
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