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Glossary
Manufactured under license from Dolby
Laboratories.“Dolby”, “Pro Logic” and the double-
D symbol are trademarks of Dolby Laboratories.
“DTS” and “DTS Digital Surround” are registered
trademarks of Digital Theater Systems, Inc.
Analog audio
Direct representation of sound by an
electrical signal. See also
Digital audio
.
Aspect ratio
The width of a TV screen relative to its
height. Conventional TVs are 4:3;
widescreen models are 16:9.
Digital audio
Indirect representation of sound using
numbers. See also
Sampling frequency
and
Analog audio
.
Dolby Digital
A multichannel audio encoding
system developed by Dolby
Laboratories that enables far more
audio to be stored on a disc than PCM
encoding. See also
PCM (Pulse Code
Modulation)
.
DRM
DRM (digital rights management) is a
technology designed to prevent
unauthorized copying by restricting
playback of material on devices other
than the PC used to record it. For
detailed information, please see the
instruction manuals or help files that
came with your PC and WMA
recording software.
DTS
A multichannel audio encoding
system developed by Digital Theater
Systems that enables far more audio
to be stored on a disc than PCM
encoding. See also
PCM (Pulse Code
Modulation)
.
Dynamic
range
The difference between the quietest
and loudest sounds possible in an
audio signal.
EXIF
(Exchangeable
Image File)
A file format developed by Fuji Photo
Film for digital still cameras. Digital
cameras from various manufacturers
use this compressed file format which
carries date, time and thumbnail
information, as well as the picture
data.
File
extension
A tag added to the end of a filename to
indicate the type of file. For example,
“.mp3” indicates an MP3 file.
ISO 9660
format
International standard for the volume
and file structure of CD-ROM discs.
JPEG
A standard file format used for still
images. JPEG files are identified by the
file extension “.jpg”.
MP3
MP3 (MPEG1 audio layer 3) is a
compressed stereo audio file format.
Files are recognized by their file
extension “.mp3”.
MPEG audio
An audio format used on Video CD/
Super VCDs and some DVD discs.
MPEG video
A video format used on Video CD/
Super VCDs and some DVD discs.
PBC
(PlayBack
Control)
A system of navigating a Video CD/
Super VCD through on-screen menus
recorded onto the disc.
PCM
(Pulse Code
Modulation)
Digital audio encoding system found
on CDs. Good quality, but requires a lot
of data compared to Dolby Digital, DTS
and MPEG encoded audio. See also
Digital audio
.
Progressive
scan video
All the lines that make up a video
picture are updated in one pass
(compared to interlace which takes
two passes to update the whole
picture).
Regions
These associate DVD-Video discs and
players with particular areas of the
world. See
DVD Video regions
on
page 69 for more information.
Sampling
frequency
The rate at which sound is measured
to be turned into digital audio data.
The higher the rate, the better the
sound quality. CD is 44.1 kHz; DVD can
be up to 96 kHz. See also
Digital audio
.
WMA
WMA is short for Windows Media
Audio and refers to an audio
compression technology developed by
Microsoft Corporation. Files are
recognized by their file extension
“.wma”.
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