文档介绍：Digital Television based on the MPEG-2 Standard
Overview
MPEG-2
Digital TV
DVB
PSI tables structure
Digital TV Distribution System
The MHP system
MPEG History
Moving Picture Experts Group was founded in January 1988 by Leonardo Chiariglione together with around 15 experts pression technology
Creator of numerous standards like MPEG-1, MPEG-2, MPEG-4, MPEG-7, MPEG-21 etc.
The Group has not limited it’s scope to only “pictures”– sound wasn’t forgot (. MPEG-1 Layer3)
Because almost all of their work is a ess story, the industry adopted fast the MPEG standard (Philips, Samsung, Intel, Sony etc)
MPEG has given birth to a number of technologies we take now for granted: DVD and Digital TV (MPEG-2), MP3 (MPEG-1 L3)
MPEG-2
In 1994, MPEG has published the ISO/IEC-13818, also known as MPEG-2
MPEG-2 was the standard adopted by DVD (Digital Video Disk or Digital Versatile Disk) and Digital TV
It is designed for pression between and 15 Mbps
MPEG-2 e in 2 forms: Program Stream and Transport Stream
Digital TV
Why use Digital TV instead of Analog TV?
ease of transcoding (changing the same perceptual content by decreasing quality, but with great gains in bitrate)
ease of storing data for future use and reprocessing
no quality loss (digitized information does not ”change” in time)
ability to supply more services (like MHP, EPG etc)
better and more flexible protection system mercial TV (encoded channels)
It has been discovered that there are more television sets than telephones in the world – huge market
The video and audio information is digitized pressed using the pression standard (source coding)
There are presently three international standards for digital television
Digital Video Broadcasting (DVB)
Advanced Television mittee (ATSC)
Integrated Services Digital Broadcasting (ISDB)
Digital TV Standards Adoption Map
Model for MPEG-2 Systems
MPEG-2 Program Stream
Similar to MPEG-1 Systems bines one or more Packetised Elementary Streams (PES), which have mon time-base