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English
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.
Bonus Group
(DVD-Audio
only)
An ‘extra’ group on some DVD-Audio
discs that requires a key number to
access.
Browsable
pictures
(DVD-Audio
only)
A feature of some DVD-Audio discs in
which the user can browse still
pictures recorded on the disc as the
audio is played.
Digital audio
Indirect representation of sound using
numbers. See also
Sampling frequency
and
Analog audio
.
DivX
DivX is a media technology created by
DivX, Inc. DivX media files contain not
only video but also include advanced
media features like menus, subtitles,
and alternate audiotracks.
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)
.
DSD
(Direct
Stream
Digital)
The Digital Audio encoding system
found on SACDs, that expresses the
audio signals by the pulse density of
one bit data.
EXIF
(Exchangeable
Image File)
A file format developed by FUJI 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.
HDMI
HDMI (High-Definition Multimedia
Interface) is a high-speed digital
interface which has the capability to
support standard, enhanced, or high-
definition video plus standard to multi-
channel surround-sound audio on a
single digital connection. HDMI
features include uncompressed digital
video, a bandwidth of up to 5 gigabytes
per second and communication
between the AV source and AV devices
such as DTVs.
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-4 AAC
MPEG-4 AAC is a compressed stereo
audio file format. Files are recognized
by the extention ‘.m4a’.
Note that some files purchased with
copyright protection (such as files from
the iTunes store) may not playback.
MPEG audio
An audio format used on Video CD/
Super VCDs and some DVD discs.
Packed PCM
(DVD-Audio
only)
A lossless compression system that
enables more PCM audio to be stored
on a DVD-Audio disc than would
otherwise be possible.
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
.
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