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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 multi-channel 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 copy
protection
DRM (digital rights management) copy
protection is a technology designed to
prevent unauthorized copying by
restricting playback, etc. of material on
devices other than the PC (or other
WMA recording equipment) used to
record it. For detailed information,
please see the instruction manuals or
help files that came with your PC (or
other WMA recording equipment) and/
or software.
DTS
A multi-channel 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
(Exchangeabl
e 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 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 67
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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