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Glossary
Analog audio
An electrical signal that directly represents sound.
Compare this to digital audio which can be an electrical
signal, but is an indirect representation of sound. See
also
Digital audio
.
Aspect ratio
The width of a TV screen relative to its height.
Conventional TVs are 4:3 (in other words, the screen is
almost square); widescreen models are 16:9 (the screen
is almost twice as wide as it is high).
Chapter
Just as a book is split up into several chapters, a title on
a DVD disc is usually divided into chapters. See also
Title
.
Digital audio
An indirect representation of sound by numbers. During
recording, the sound is measured at discrete intervals
(44,100 times a second for CD audio) by an analog-to-
digital converter, generating a stream of numbers. On
playback, a digital-to-analog converter generates an
analog signal based on these numbers. See also
Sampling frequency
and
Analog audio
.
Dolby Digital
1
With multichannel audio, this high quality surround
system is used in many movie theaters around the world.
Manufactured under licence from Dolby Laboratories.
“Dolby” and the double-D symbol are trademarks of Dolby
Laboratories.
DRM (Digital Rights Management)
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
DTS stands for Digital Theater System. DTS is a surround
system different from Dolby Digital that has become a
popular surround sound format for movies.
“DTS” and “DTS Digital Out” are registered trademarks of
Digital Theater Systems, Inc.
Dynamic range
The difference between the quietest and loudest sounds
possible in an audio signal (without distorting or getting
lost in noise). Dolby Digital and DTS soundtracks are
capable of a wide dynamic range, delivering dramatic
cinema-like effects.
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 file format used for still images, such as photographs
and illustrations. JPEG files are identified by the file
extension “.jpg” or “.JPG”. Most digital cameras use this
format.
MP3
MP3 (MPEG1 audio layer 3) is a compressed audio file
format. Files are recognized by their file extension “.mp3”
or “.MP3”.
MPEG audio
An audio format used on Video CDs and some DVD
discs. This unit can convert MPEG audio to PCM format
for wider compatibility with digital recorders and AV
amp/receivers. See also
PCM
.
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