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products from different vendors. UPnP devices
should be able to connect to a network
automatically, handling identication and other
processes on the y. The standards developed
by the UPnP Forum are media-, platform-, and
device-independent.
USB(universalserialbus)
A hardware interface used to connect devices
such as computer audio players, digital cameras,
and more. USB is UPnP enabled (also called
hot-swappable), meaning that a computer does
not need to be turned off when new devices
are plugged in and the devices do not need to
be congured. USB supports data transfer rates
of up to 60MB per second (in USB 2.0).
V
VBR(variablebitrate)
With VBR, the encoder takes as much bits as
it needs. So black pictures get few bits and
complex pictures get as much as they need.
While this provides the best quality the nal
size cannot be predicted at all.
Volume
Volume is the most common word used to
specify the control of relative loudness of
sounds. It also pertains to the function on many
electronic devices that is used to control the
loudness.
W
W(wattage)
A measurement of power. In speakers, wattage
is a term that indicates power-handling
characteristics in dealing with electrical voltage
inputs from the amplier.
WAP(WirelessApplicationProtocol)
Global protocol used in some wireless devices
that allows the user to view and interact with
data services. Generally used as a means to
view Internet web pages using the limited
transmission capacity and small display screens
of portable wireless devices.
Signal to noise ratio
Represents the difference between the level of
the audio signal, and any interference. The larger
the gure, the purer the sound.
SPL(soundpressurelevel)
An acoustic measurement of sound energy.
1 dB SPL is the smallest increment in sound
level to which the average human is sensitive.
Theoretically, 0 dB SPL is the threshold of
human hearing while approximately 120 dB is
the threshold of pain.
Stereo
Literally means solid. Usually taken to refer to
two channel stereo, though developments in
digital audio facilitate multichannel stereo.
Streaming
A technique for transferring data such that it
can be processed as a steady and continuous
stream. Streaming technologies are often used
on the Internet because many users do not
have fast enough access to download large
multimedia les quickly, so the client browser or
plug-in can start displaying the data before the
entire le has been transmitted.
Subwoofer
The extra-low frequency drive-unit
(loudspeaker) that can be used to augment
both stereo and surround system.
T
Treble
High frequencies at the top end of the audio
band i.e. above 3kHz.
Tweeter
The drive unit (loudspeaker) that reproduces
high frequency sounds.
U
UPnP(UniversalPlugandPlay)
Universal Plug and Play is a networking
architecture developed by a consortium of
companies to ensure easy connectivity between
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was6050_ifu_01en_04de_03es_02fr_38 38 2008-02-14 12:40:44 PM