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Compression
In audio terms, this is a process of temporarily
or permanently reducing audio data for more
efficient storage or transmission. A temporary
reduction in file size is called 'non-lossy'
compression, and no information is lost. A
permanent reduction in file size (such as with
MP3 files) 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 flow of electric charge. This is typically
in a conductor such as a wire. In direct current,
the electric charges flow in the same direction,
distinguishing it from AC (alternating current).
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 Music Station and consumes less than 1W. It
is 'economic' and environmentally friendly to use
this mode during longer times of non-usage of
the Music Station.
EQ (Equalizer)
A class of electronic filter circuits designed
to augment or adjust electronic or acoustic
systems. Equalizers can be fixed 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.
FM (Frequency Modulation)
In radio broadcasting: a method of modulation
in which the frequency of the carrier voltage
is varied with the frequency of the modulation
voltage.
Frequency
The property or condition of occurring at
frequent intervals. In sound, this simply refers
to the regular occurrence of compression and
rarification of air that we experience as sound.
Frequency Response
Is the range of frequencies that a speaker
reproduces, lowest frequency to the highest.
While the optimal normal is 20-20,000 Hz
(Hertz), the range of human hearing for
individuals is often much more restricted.
A good full-range speaker system however,
reproduces as much of this range as possible to
cover all variations. Individual drivers are limited
to reproduce only that part of the spectrum
EN
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