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08
40
En
Glossary
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
.
DivX
DivX is a digital video format created by
DivX, Inc.
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
DRM (digital rights management) copy
protection is a technology designed to
prevent unauthorized copying by
restricting playback, etc. of
compressed audio files on devices
other than the PC (or other recording
equipment) used to record it. For
detailed information, please see the
instruction manuals or help files that
came with your PC 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)
.
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 CDs
and some DVD discs.
PBC
(PlayBack
Control)
A system of navigating a Video CD
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 39 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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