Additional information
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138
En
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
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 the HDD/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
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 (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 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
(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 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.
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
.
Title
A collection of chapters on a the HDD/DVD disc.
See also
Chapter
.
Track
Audio CDs and Video CDs use tracks to divide up
the content of a disc. The DVD equivalent is
called a chapter. See also
Chapter
.
WMA
WMA is short for Windows Media Audio and
refers to an audio compression technology
developed by Microsoft Corporation. WMA data
can be encoded by using Windows Media Player
version 9 or Windows Media Player for Windows
XP. Files are recognized by their file extension
".wma" or ".WMA".
Microsoft, Windows Media, and the Windows
logo are trademarks, or registered trademarks of
Microsoft Corporation in the United States and/or
other countries.
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