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Dolby Digital (5.1)
Dolby Digital, also designated as AC3, is a digital
sound format, by which up to six seperate audio
channels can be transported. With most of the current
DVDs, the sound is stored in the so called "Dolby
Digital 5.1" format; the "5" in the title "5.1" stands
for three front and two rear surround sound chan-
nels, the "1" for the bass sound chanel.
DTS
DTS is the abbreviation for "Digital Theatre System"
and and denotes one of the most common sur-
round sound formats for DVDs. As with Dolby Digi-
tal 5.1, DTS uses three front and two rear surround
sound channels as well as a bass sound channel.
17.4 What are PAL, NTSC and
SECAM?
PAL
PAL is the abbreviation for "Phase Alternation Line".
PAL is the mid and west Europe (Exception: France,
see the heading "SECAM") customary and most
wide spread colour television standard.
NTSC
NTSC is the abbreviation for "National Television
System Committee". NTSC is a colour television
standard that is primarily used in the USA and
Japan.
SECAM
SECAM is the abbreviation for the french "système en
couleur avec mémoire". SECAM is the customary
colour television norm in France and many east
European countries and at present still the most
widely spread system in those countries.
17.5 MP3, WMA, JPEG and MPEG
MP3
MP3 denotes a process and/or format developed
by the Fraunhofer Institute for the compression of
audio data. In the MP3 format compressed music
pieces are only a fraction of their original size,
which, for example, on CD-Rs/CD-RWs allows for
storage of a considerably greater volume of music
than on commercially available audio CDs, on
which audio data is stored in the CDA format.
The structure of an MP3-CD can, for example, ap-
pear as follows, if the MP3 data is stored in files:
MP3-CD
WMA
WMA ("Windows® Media Audio") is a data format
developed by Microsoft® for audio data.
JPEG
JPEG ("Joint Photographics Expert Group") denotes
a wide spread graphic format, developed by the orga-
nization with the same name, with which image data
of the colour and grey scales are compressed.
MPEG
MPEG ("Moving Picture Experts Group") refers to a
video compression format.
17.6 What are files?
As opposed to audio CDs the title on a CD-R/CD-
RW with MP3-, WMA- or JPEG data can be stored
in files, for example, in order to file titles from
different genres.
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FOLDER
MP3
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