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Macroblock
Mbps
MCC
MCPC
Meta-data
MMDS
Motion
Compensation
Motion Estimation
Motion Vector
MP@ML
MP@HL
MPEG
MPEG-2
MPLS
EN/LZT 790 0005 R7A
A 16x16-pixel area of the TV picture. Most processing within the
MPEG domain takes place with macro blocks. These are converted
to four 8x8 blocks using either frame DCT or field DCT. Four 8 x 8
blocks of luminance data and two (4:2:0 chrominance format), four
(4:2:2) or eight (4:4:4) corresponding 8 x 8 blocks of chrominance
data coming from a 16 x 16 section of the luminance component of
the picture. Macroblock can be used to refer to the sample data and
to the coded representation of the sample values and other data
elements.
Million bits per second.
Multiplex Control Computer: A component of a System 3000
compression system. The MCC sets up the configuration for the
System 3000 Multiplexers under its control. The MCC controls both
the main and backup Multiplexer for each transport stream.
Multiple Channels Per Carrier.
Meta-data is descriptive data that is "tagged" to a movie or audio
clip. Meta-data is essential for the broadcaster.
Multichannel Microwave Distribution System: A terrestrial microwave
direct-to-home broadcast transmission system.
The use of motion vectors to improve the efficiency of the prediction
of sample values. The prediction uses motion vectors to provide
offsets into the past and/or future reference frames or fields
containing previously decoded sample values that are used to form
the prediction error signal.
The process of estimating motion vectors in the encoding process.
A two-dimensional vector used for motion compensation that
provides an offset from the coordinate position in the current picture
or field to the coordinates in a reference frame or field.
Main Profile at Main Level: A subset of the MPEG-2 standard, which
supports digital video storage (DVD etc.) and transmissions up to
15 Mbps over various mediums.
Main Profile at High Level: A subset of the MPEG-2 standard, which
supports digital video storage (DVD etc.) and transmissions up to
80 Mbps over various mediums.
Moving Pictures Experts Group: The name of the ISO/IEC working
group which sets up the international standards for digital television
source coding.
Industry standard for video and audio source coding using
compression and multiplexing techniques to minimize video signal
bit rate in preparation for broadcasting. Specified in ISO/IEC 13818.
The standard is split into layers and profiles defining bit rates and
picture resolutions.
Multi-protocol Label Switching. A Quality of Service mechanism for
IP networks that allow IP packets to flow along a predefined path in
a network, improving the reliability and robustness of the
transmission.
Glossary
A-11
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