Philips NP1100/05 Manual Do Utilizador

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).
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 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.

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

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11 Glossary

AAC (Advanced Audio Coding)

An audio compression scheme defined as part

of the MPEG-2 standard (also known as MPEG-

2 AAC or MPEG-2 NBC, or Not Backwards

Compatible). It offers better sound and a

compression ratio that is superior by roughly 30

percent compared to the MPEG-1 MP3 format.
AC (alternating current)

An alternating current is an electrical current

whose magnitude and direction vary cyclically,

as opposed to DC (direct current), whose

direction remains constant. The usual waveform

of an AC power circuit is a sine wave, as this

results in the most efficient transmission of

energy. However certain applications use

different waveforms, such as triangular or square

waves.
Audio output

High-level (speaker) or line-level (RCA) signals

sent from one system component to another;

or the high-level signal from an amplifier to the

system speakers.

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

blackness of a picture or complete silence in an

audio frame. And pictures or audio frames with

a lot of elements may need those bits.

dB (Decibel)

A unit of measure used to express relative

difference in power or intensity of sound.

Glossar