Philips Consumer Lifestyle NP2900 Manuale Utente

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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

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, 

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 finally, 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 

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 

EN