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Glossary
MEM Multiplex Element Manager: A GUI-based control system, part of the
range of Ericsson AB compression system control element products.
The evolution 5000 MEM holds a model of the system hardware.
Using this model, it controls the individual system elements to
configure the output multiplexes from the incoming elementary
streams. The MEM monitors the equipment status and controls any
redundancy switching.
Meta-data Meta-data is descriptive data that is "tagged" to a movie or audio
clip. Meta-data is essential for the broadcaster.
MMDS Multichannel Microwave Distribution System: A terrestrial microwave
direct-to-home broadcast transmission system.
Motion
Compensation
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.
Motion Estimation
The process of estimating motion vectors in the encoding process.
Motion Vector 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.
MP@ML 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.
MP@HL 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.
MPEG Moving Pictures Experts Group: The name of the ISO/IEC working
group which sets up the international standards for digital television
source coding.
MPEG-2 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.
MPLS 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.
MPTS Multi-Program Transport Streams. Transport Streams that carry
multiple TV/Radio services.
msb
Most significant bit.
Msymbol/s (Msym/s) Mega (million) Symbols per second (10
6
Symbols per
second).
Multiplex A number of discrete data streams (typically 8 to 12), from
encoders, that are compressed together in a single DVB compliant
transport stream for delivery to a Modulator.
EN/LZT 790 0003/2 R1A
A-11