37
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.
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.
E
Eco (Eco Standby)
Eco Standby is the most ‘economic’ mode of
the WAC7500 and consumes less than 1W. It is
‘economic’ and environmentally friendly to use
this mode during longer times of non-usage of
the WAC7500.
EQ (Equalizer)
A class of electronic lter circuits designed
to augment or adjust electronic or acoustic
systems. Equalizers can be xed or adjustable,
active or passive. Many equalizers divide the
spectrum into 3 to 12 bands. This allows each
section to be either increased or decreased in
amplitude without changing the response of
the rest.
F
Fidelity
A term used to describe the accuracy of
recording, reproduction, or general quality of
audio processing. “High Fidelity” (Hi-Fi) is the
goal of every designer.
•
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
played, 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
efcient 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
involves discarding unnecessary information
which is irretrievably lost.
D
dB (Decibel)
A unit of measure used to express relative
difference in power or intensity of sound.
D
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 Conguration
Protocol. It is a protocol for assigning dynamic
IP addresses to devices on a network.
Glossary English
EN