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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).
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 / Pro Logic II
Dolby Digital uses up to 5.1 discrete channels
of audio for surround sound. The front, center
and surround channels are full range, while a
Low Frequency Effects channel delivers bass
sounds often used for sound effects (hence
5.1 channels).
Dolby Pro Logic II is a matrix decoding system
that extracts 4.1 (Dolby Pro Logic) or 5.1
(Dolby Pro Logic II) channel surround sound
from a two channel source.
DRM
DRM (Digital Rights Management) is a type of
server software developed to enable secure
distribution of paid content over the Web,
recently incorporated by WMA (Windows
Media Audio).
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.
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 very 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
International standard for the volume and file
structure of CD-ROM discs.
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