|
Worldwide the television industry is currently in the process
of changing from analog to digital technology. MPEG-2 has
now been universally adopted as the main standard for video
compression. Since MPEG-2 must be decoded at the same rate
it was encoded at an information layer needs to be added to
the MPEG in order to transmit it to end users. Standards have
been created by industry to provide for the methodology of
packetizing MPEG-2 streams and adding encoding information
in tables via data packets to the video packets The DVB standard
has been approved by the European Community and other industry
and government groups as the standard to accommodate the need
for satellite and terrestrial originated digital television.
This product complies with the DVB ASI specifications as defined
in ETSI TR 101 891 and provides for the ability of computers
to capture, process, and transmit DVB ASI compliant streams.
THE DVB ASI STANDARD
DVB ASI defines a method of digitally transmitting MPEG-2
Transport Streams at 270 mbps and is designed to be transmitted
via QPSK modulation via a satellite-based router to the home
receiver. It is usually composed of a many standard definition
4-6 Mbps streams Multiplexed together with associated audio
streams in various languages into a multi Program Transport
Stream . . This is the standard that is usually used to feed
most brands of DVB Modulators. Our DVB Master Quad input device
can be used to create multiple inputs for Video Servers or
test equipment that is compatible with the DVB ASI standard.
Clock Issues: The DVB ASI standard specifies a very accurate
30 ppm clock. The cabling for DVB requires a 75 ohm Coaxial
Cable with BNC connectors.
|
Chinese
English
Korean 
Japanese 
French
