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Dolby Digital (5.1)
Dolby Digital, also referred to as AC3, is a digital audio
format with which up to six separate audio channels
can be transmitted. On most current DVDs, the audio is
stored in "Dolby Digital 5.1" format; the "5" in the
name "5.1" stands for the three front and two rear sur-
round sound channels, the "1" stands for the subwoofer
channel.
DTS
DTS is the abbreviation for "Digital Theatre System"
and refers to one of the most common surround sound
formats for DVDs. As with Dolby Digital 5.1, DTS uses
three front and two rear surround sound channels as
well as a subwoofer channel.
What are PAL, NTSC and SECAM?
PAL
PAL is the abbreviation for "Phase Alternation Line".
PAL is the typical and most common colour television
standard in Central and Western Europe (exception:
France, see "SECAM").
NTSC
NTSC is the abbreviation for "National Television
System Committee". NTSC is a colour television stan-
dard that is used primarily in the USA and Japan.
SECAM
SECAM is the abbreviation for the French "système en
couleur avec mémoire". SECAM is currently the typi-
cal and most common colour television standard in
France and many Eastern European countries.
Audio CDs
Audio CDs contain only audio data; they are also avai-
lable in the sizes 8 cm and 12 cm (diameter). The
playback time for the audio data stored on CDs is 20
minutes (8 cm size) or 74 minutes (12 cm size). Audio
data is stored on audio CDs in the CDA format.
MP3
MP3 refers to a method or format for compression of
audio files developed by the Fraunhofer Institute.
Works of music compressed in MP3 format are only a
fraction of their original size, making it possible to store
significantly more music on CD-Rs/CD-RWs, for exam-
ple, than can be stored on typical audio CDs that save
the audio data in the CDA format.
WMA
WMA ("Windows® Media Audio“) is a file format for
audio files developed by Microsoft®.
JPEG
JPEG ("Joint Photographics Expert Group") refers to
a widely used graphics format developed by the organi-
sation of the same name, with which colour and gray
scale image data are compressed.
DivX
DivX® is an encoding format for video and multimedia
data developed by the company DivXNetworks®, Inc.
MPEG
MPEG ("Moving Picture Experts Group") refers to a
video compression standard.
What are folders?
In contrast to → audio CDs, the titles on a CD-R/CD-
RW with → MP3, → WMA or
→ JPEG files can be stored in folders, for example, to
organise titles from various genres.
For instance, the structure of an MP3 CD may appear
as shown below if the MP3 files were saved in folders.
Fig. 25 Possible folder structure for an MP3 CD
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