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En
Glossary
*1
Manufactured under license from Dolby
Laboratories. “Dolby” and the double-D symbol
are trademarks of Dolby Laboratories.
*2
“DTS” and “DTS Digital Out” 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
*1
1
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 material on
devices other 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
*2
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
(Exchangeabl
e Image File)
A file format developed by Fuji Photo
Film for digital still cameras. Digital
cameras from various manuafcturers
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.
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 37 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”.
Microsoft, Windows Media, and the
Windows logo are trademarks, or
registered trademarks of Microsoft
Corporation in the United States and/or
other countries.
DV270_ASIA.book 39 ページ ２００４年２月２１日 土曜日 午後３時２９分