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9 Glossary
Analogue
Sound that has not been switched into numbers.
Analogue sound varies, while digital sound has
specifi c numerical values. These sockets send audio
through two channels, the left and right.
Dolby Digital
A surround sound system developed by Dolby
Laboratories containing up to six channels of
digital audio (front left and right, surround left
and right, centre and subwoofer).
Dolby Surround Pro Logic II
It is an improved matrix decoding technology that
provides better spatiality and directionality on
Dolby Surround program material, provides a
convincing three dimensional sound fi eld on
conventional stereo music recordings and is ideally
suited to bring the surround experience to
automotive sound. While conventional surround
programming is fully compatible with Dolby
Surround Pro Logic II decoders, soundtracks will
be able to be encoded specifi cally to take full
advantage of Pro Logic II playback, including
separate left and right surround channels. (Such
material is also compatible with conventional Pro
Logic decoders.)
DTS
Digital Theater Systems. This is a surround sound
system, but it is different from the Dolby Digital.
The formats were developed by different
companies.
MP3
A fi le format with a sound data compression
system. ‘MP3’ is the abbreviation of Motion
Picture Experts Group 1 (or MPEG-1) Audio
Layer3. By using the MP3 format, one CD-R or
CD-RW can contain about 10 times more data
than a regular CD. Files are recognised by their
fi le extension ‘.MP3’.
Multi-channel
DVDs are formatted to have each sound track
constitute one sound fi eld. Multi-channel refers to
a structure of sound tracks having three or more
channels.
Surround
A system for creating realistic three dimensional
sound fi elds full of realism by arranging multiple
speakers around the listener.
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