Digital Broadcast Technology Development. Presented by John Yip Chief Engineer RTHK 2006.12.06. 1. Introduction. DTT/ HDTV IPTV Mobile TV (T-DMB, DVB-H, MediaFLO, One Seg). Broadcast Development. TV on Cable and Satellite, MUSE analog HD. TV. DAB.
TV on Cable and
MUSE analog HD
1960 1970 1980 1990 2000
DVB-H, CMMB, IPTV-HD on VDSL2, 4G-OWA ?
* Mature Digital TV and IP Technologies:
Multi-platforms (horizontal) and multi-
qualities (vertical) for the viewers.
New Digital Age
Maximize ROI (savings, revenue)/ business value.
DTT/ HDTV, IPTV-SD, 3G, S/T-DMB, WiMax
Converging technologies lead to a divergence of viewers’ choices.
Quality:traded-off against mobility,
transmission costs. Video bitrates, from 0.2
Mbps (for mobile phones) to over 100 Mbps
for HDTV. Quality vs user cost, but
technologies provide flexibility, improvements.
Compelling contents can drive people to buy new technologies, e.g. sports.
People’s habits/ life styles are then gradually changed by the new technologies.
- Ubiquitous: anywhere, anytime, desired form
- Mobility increases
- Threshold of acceptable quality dropping
- Networked environment eg office, home
- Time-shifted viewing/ listening eg PVR, ipod
DAB(Digital Audio Broadcasting)
A technology for multi-channel audio broadcasts. Based on European Eureka-147 standard, developed in mid 1990’s.
DRM(Digital Radio Mondiale)
An open-source platform for digital radio broadcasting in AM, SW or FM bands. Fits within existing AM channel bandwidth.
DMB(or T-DMB, Digital Multimedia Broadcasting)
A digital system for sending data, radio and TV to mobile devices such as mobile phones. Developed by S. Korea (T-DMB, S-DMB). DAB-compatible.
(Digital Terrestrial TV)
Using digital technology to provide
- more channels (SDTV) and/ or
-better picture (HDTV) and sound (surround)
through a TV antenna eg on top of the roof, instead of using cable, satellite or internet.
(High Definition TV)
Chart 1: World-wide, DTT/ HDTV Transmission
Chart 1: World-wide, DTT/ HDTV Transmission (Cont.)
(Internet Protocol TV)
Broadcast to hand-sets (mobile phones, PDAs), notebook PCs, etc. Interactive and audio services.
Evolved from DAB. Allows video, audio and data to be
transmitted to mobile devices. More efficient audio coding. Backward compatible with DAB audio (MUSICAM).
DVB-H (Digital Video Broadcasting – Handheld)
Tailored for transmitting multiple TV channels to mobile devices. Time-slicing technology conserves battery power of mobile devices.
* Chicken vs egg; (govt. + industry) vs consumers; content creation vs consumption; market size vs consumers’ costs.
* Economics: predictive of a rapid roll-out of costly digital HDTV.
GDP--> size of economy --> strength for driving technology/ content creation.
GDP-per-capita--> consumer’s ability buy new devices/ contents.
Observations from AI (affordability index) data:
Factors: Accelerating HDTV
Propelling Factor (HDF) = M (r,p,m,o)*(GDP*GDP-per-capita)
where GDP is based on the PPP method, and
(GDP*GDP-per-capita) = Affordability factor,
M is a function of regulatory/ pricing/ marketing/ other factors
M is proportional to (HDTV sets-per-capita, %) divided by AI.
Factors: Accelerating HDTV (cont.)
Propelling Factor (HDF)
= M (r,p,m,o)*(GDP*GDP-per-capita)
On breaking down function M :
HDF = (Ar * Ap * Am * Ao) * (GDP*GDP-per-capita)
Strategic factors to foster HD development:
Ar, Ap, Am, Ao
Ar– regulatory, mandating early rollout/ early cessation of analog TV, built-in digital tuners in TV sets, HD on-air quota, spectrum allotments, licensing regime, standardization;
Ap– subsidies by governments/ operators, assisting viewers eg on HDTV STB;
Am– Promotional/ marketing campaigns, to promote viewers’ awareness;
Ao–leapfrog into HD (eg Canada and S. Korea, using ATSC, have achieved fast rollouts), adopting HDV/ low-cost EFP production, D-cinemas/ communal/ public viewing.
(IPTV is just one more method for delivering HDTV but it is not affected by spectrum scarcity. IT technologies are used in the delivery process to connect the contents to the services.)
IPTV (HD, SD) and Economics
Propelling Factor (IPTF) = Mi (r,p,m,o) * (GDP-per-sq. km)
Equation applies to targeted cities, for IPTV-SD.
Mobile TV and Economics
Propelling Factor (MTF) = Mm (r,p,m,o) * T * (GDP-per-capita)
where T = Terrain factor, 0 < T =< 1. Terrain factor is technology (VHF, UHF, satellite) and frequency-band dependent, for targeted Cities.
Sources : wilkipedia, internetworldstat.com, etc.