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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
Encryption key
An encryption key is an alphanumeric series
that enables data to be encrypted and then
decrypted so it can be safely shared among
members of a network.
F
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
for which they were made, so their response is
limited, but still a necessary point to consider
when designing a complete sound system.
FullSound
FullSound™ is an innovative technology
designed by Philips. FullSound™ faithfully
restores sonic details to compressed music,
enhancing it to provide a full sound experience
without any distortion.
H
Hz (Hertz)
Cycles per second, named after Heinrich Hertz.
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
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
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).
Decibel (dB)
A unit of measure used to express relative
difference in power or intensity of sound.
DHCP
DHCP stands for Dynamic Host Configuration
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.
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
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