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37
D
dB (Decibel)
A unit of measure used to express relative
difference in power or intensity of sound.
DC (direct current)
Direct
current or continuous current is the
constant ow of electric charge. This is typically
in
a conductor such as a wire. In direct current,
the electric charges ow in the same direction,
distinguishing it from AC (alternating current).
DHCP
DHCP stands for Dynamic Host Conguration
Protocol.
It is a protocol for assigning dynamic
IP addresses to devices on a network.
Digital
A
method to encode information using a binary
code of 0s and 1s. Many wireless phones and
networks use digital technology.
Digital Audio
Digital
Audio is a sound signal that has been
converted into numerical values. Digital sound
can be transmitted through multiple channels.
Analog sound can only be transmitted through
two channels.
DTS
Digital
Theatre Systems. A surround sound
system for providing 5.1 channels of discrete
digital audio in consumer electronics products
and software content. It is not developed by
Dolby Digital.
Duplex (half/full)
Full
duplex is the ability to send and
receive data simultaneously. Duplex is
synonymous with full duplex. Example:
when a modem operates in full-duplex
mode, it can transmit data in two
directions simultaneously. In half-duplex
mode it can transmit data in two directions,
but not simultaneously.
DVD±R
Each time you store a recording or a le on a
D
VD±R, the space that it takes up can never be
•
C
CBR (constant bit rate)
With CBR the encoder spends the same
amount
of bits on each frame, regardless of
how much it may really need. Disadvantage
of CBR: Bits are wasted in case of absolute
b
lackness of a picture or complete silence in an
audio frame. And pictures or audio frames with
a lot of elements may need those bits.
CD (Compact Disc)
For
mat developed by Phillips, Sony, and Pioneer
for conveying music and data. CDs record
information by deforming the inner metal foil
on the disc with tiny micro pits burned in by a
laser.
CDDB
A
centralized database of CDs, CD tracks, and
artists on the Web, now known as Gracenote.
The audio player or burner program can log on
to CDDB. It uploads the ID of the CD being
pla
yed, and then downloads the title, artist, and
track list.
Coaxial
A
single copper conductor, surrounded with
a layer of insulation, covered by a surrounding
copper shield and nally, an insulating jacket.
An
unbalanced transmission line with constant
impedance. In audio, this type is commonly used
for low level, line signals terminated in RCA
connectors.
Compression
In
audio terms, this is a process of temporarily
or permanently reducing audio data for more
efcient storage or transmission. A temporary
reduction in le size is called ‘non-lossy’
compression,
and no information is lost. A
permanent reduction in le size (such as with
MP3 les) is called ‘lossy’ compression, and
in
volves discarding unnecessary information
which is irretrievably lost.
EN
wac7500_um_01eng.indd 37 14-08-08 16:29:59
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