Glossary
© 2013 Harmonic Inc.
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Ellipse 3000 r.3.0, Rev. B
modulator
A device that places a lower frequency stream onto a higher frequency carrier by changes to
the carrier’s amplitude, phase, or frequency (or a combination of them).
module
A circuit board installed in a component that contains input/output ports.
MOM
A card for the MN20 multiplexer which generates up to four multiple program transport
streams (
), each over a DVB-ASI interface. A MOM allows a single MN20 to drive
multiple modulators with aggregate bandwidth up to 100 Mbps.
monaural
A channel that has a single audio signal.
MPE
A PID which can contain anything.
MPEG
Moving Picture Experts Group. A joint working group of the International Standards
Organization and International Electrotechnical Committee. Some portions of the MPEG
Standards have also been prepared jointly with the ITU-T.
MPEG-1
A family of specifications developed originally for compression of low-resolution (SIF) video at
24-, 25-, and 30-Hz frame rates with associated audio. At these resolutions, 1.5 Mbps audio
and video data can be stored on a standard compact disk (CD).
MPEG-2
A family of specifications developed originally for compression of studio television at
24-, 25-, and 30-Hz frame rates. The system layer has support for additional functionality,
including tolerance to errors, which makes it generally more suitable for transmission than
MPEG-1.
MPEG-4
A family of specifications developed originally for video games. The original video coding
specification has been supplanted by AVC, MPEG-4 Part 10 (also known as H.264), which
provides significant compression efficiencies over MPEG-2 video coding. Also includes AAC/
HE AAC audio coding specifications.
MPTS
Multiple Program Transport Stream. Several MPEG programs multiplexed together into a
single Transport Stream.
MSMQ
Microsoft Message Queue.