Glossary - A Practical Guide to Video and Audio Compression - page 734

Topic Description

MPEG-4 Part 2 The original video standard for MPEG-4 was referred to as

MPEG-4 visual. While the compression is not as efficient as Part
10 of the MPEG-4 standard, there are some interesting features
that Part 2 offers for multimedia applications. These additional
features may be added to a later version of the MPEG-4 Part 10
standard. This codec is not recommended for use in new
projects.

MPEG-4 part 10 A codec that has been developed jointly by the ISO/MPEG and

ITU-T/VCEG working groups. Currently equivalent to H.264.

MPEG-7 The metadata standard. This describes the content that is stored

in MPEG-4 essence packages.

MPEG-21 The rights-control systems of the future will be built around

MPEG-21 standards. These describe how MPEG-4 content is
allowed to be accessed and will use MPEG-7 metadata as part of
the process.

MPEGIF MPEG Industry Forum. This was previously known as the

MPEG-4 Industry Forum.

Multiplex On digital terrestrial TV (DTT) and digital audio broadcasting

(DAB), the transport streams are delivered in a multiplex that
corresponds to one tunable channel on the broadcasting
medium. The receiver can then extract a transport stream
(another name for a multiplex) and dismantle it to retrieve the
individual channels.

NAB National Association of Broadcasters.

Narrow-band Another way of describing modem-based dialup connections as

opposed to ADSL broadband connections.

Node (1) One item within a tree-structured collection of objects either in a

file or in memory.

Node (2) A single computer on a network.

NTSC National Television Standards Committee.

Nyquist Harry Nyquist postulated the rule that sampling must take

place at twice the maximum frequency that you require to be
recorded. Subsequent research suggests that higher sample rates
are necessary to fully recover the shape of the wave form
at that frequency, since the Nyquist rule only recovers a square
wave at the maximum frequency. Many ideas that we take for
granted in telecoms and digital media stem from work that
Harry Nyquist did in the early 20th century, long before TV was
invented.