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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 Conguration
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.
F
Frequency
The property or condition of occurring at
frequent intervals. In sound, this simply refers
to the regular occurrence of compression and
rarication 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
A
AAC (Advanced Audio Coding)
An audio compression scheme dened 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 efcient 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 amplier to the
system speakers.
C
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.
D
dB (Decibel)
A unit of measure used to express relative
difference in power or intensity of sound.
Glossary
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