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10Additional information
GlossaryDRM
DRM (digital rights management) is a type of
server software developed to enable secure
Analog audio
distribution of paid content over the web,
An electrical signal that directly represents
sound. Compare this to digital audio which recently incorporated by WMA (Windows
Media Audio ).
can be an electrical signal, but is an indirect
representation of sound. See also Digital
audio.DTS
Aspect ratio
The width of a TV screen relative to its height.
DTS stands for Digital Theater Systems. DTS
Conventional TVs are 4:3 (in other words, the
screen is almost square); widescreen models is a surround system different from Dolby
Digital that has become a popular surround
are 16:9 (the screen is almost twice as wide as
it is high).sound format for movies.
Dynamic range
Digital audio
An indirect representation of sound by The difference between the quietest and
loudest sounds possible in an audio signal
numbers. During recording, the sound is
(without distorting or getting lost in noise).
measured at discrete intervals (44,100 times a Dolby Digital and DTS soundtracks are
second for CD audio) by an analog-to-digital
capable of a very wide dynamic range, deliv-
converter, generating a stream of numbers. ering dramatic cinema-like effects.
On playback, a digital-to-analog converter
generates an analog signal based on these
numbers. See also Sampling frequency and EXIF (Exchangeable Image File)
Analog audio.A file format developed by Fuji Photo Film for
digital still cameras. Digital cameras from
Dolby Digitalvarious manuafcturers use this compressed
file format which carries date, time and
thumbnail information, as well as the picture
1data.
Using a maximum of 5.1 channels of audio,
File extension
this high quality surround system is used in A tag added to the end of a filename to indi-
many of the finer movie theaters around the
cate the type of file. For example, O.mp3� indi-
world.cates an MP3 file.
The on-screen display shows which channels
are active, for example showing 3/2.1. The 3
ISO 9660 format
being the two front channels and the center
channel; the 2 being the surround channels, International standard for the volume and file
structure of CD-ROM discs.
and the .1 being the LFE channel.
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