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Glossary of Terms
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AXIS 213 - Glossary of Terms
Active Speaker - a speaker with a built-in power
amplifier.
ActiveX - A control (or set of rules) used by a browser.
ActiveX controls are often downloaded and installed
automatically as required.
ADPCM - Adaptive Differential Pulse Code
Modulation. Predicts the analog signal digitally and
the difference is coded.
AMC - AXIS Media Control. The control required for
viewing video images in Internet Explorer. Installs
automatically on first use.
API - Application Programming Interface. The Axis
API can be used for integrating Axis products into
other applications.
ARP - Address Resolution Protocol. A protocol for
assigning an IP address to a physical device address
that is recognized in the local network. The ARP
command can be used to set the IP-address for your
product.
ARTPEC - Axis Real Time Picture Encoder - used for
video image compression.
CCD - Charge Coupled Device. CCD is one of the two
main types of image sensors used in digital cameras.
When a picture is taken, the CCD is struck by light
coming through the camera’s lens. Each of the
thousands or millions of tiny pixels that make up the
CCD convert this light into electrons.
CGI - Common Gateway Interface. A set of rules (or a
program) that allows a Web Server to communicate
with other programs.
Client/Server - Describes the network relationship
between two computer programs in which one, the
client, makes a service request from another - the
server.
dB (Decibels) - A unit to measure sound level
changes. A 3dB change is the smallest level change we
can hear. A 3dB change is actually twice or half the
audio power level. A gain of 0dB will leave the signal
level unchanged.
DC-Iris - This special type of iris is electrically
controlled by the Axis camera, to automatically
regulate the amount of light allowed to enter.
De-interlacing - An image quality improvement
process taking a stream of interlaced frames and
converting it to a stream of progressive frames.
DNS - The Domain Name System (DNS) locates and
translates Internet domain names into IP (Internet
Protocol) addresses.
Ethernet - A widely used networking standard.
ETRAX - Axis' own microprocessor.
Firewall - A virtual barrier between a LAN (Local Area
Network) and other networks, e.g. the Internet.
FTP - File Transfer Protocol. Used for the simple
transfer of files to and from an FTP-server.
Full duplex - Transmission of data, e.g. audio, in two
directions simultaneously.
G.711 - G.711 is the international standard for
encoding telephone audio on 64 kBit/s channel. It is a
pulse code modulation (PCM) scheme operating at 8
kHz sample rate.
G.726 - Frequently used speech-compression
algorithm in telecommunications due to its high
perceived speech quality and low resource
requirements.
HAD - Hole Accumulation Diode. A HAD CCD design
allows for more light to reach the imager, which
reduces video noise to improve signal-to-noise ratio
by up to 6dB (2x better than a standard CCD imager).
Particularly effective when shooting in dark
situations.
Half duplex- A half duplex link can communicate in
only one direction, at a time. Two way communication
is possible, but not simultaneously. Walkie-talkies and
CB radios mimic this behavior in that you cannot hear
the other person if you are talking.
HTML - Hypertext Mark-up Language. Used widely
for authoring documents viewed in web browsers.
HTTP - Hypertext Transfer Protocol. The set of rules
for exchanging files (text, images, sound, video, and
other files) on the World Wide Web.
Intranet - A private network limited to an
organization or corporation. Usually closed to
external traffic.
IP - Internet-Protocol. See TCP/IP.
IP address - A unique number used by a network
device, to allow it to be identified and found on the
network. The 32-bit IP address is made up of four
groups (or quads) of decimal digits separated by
periods. An example of an IP address is: 192.168.0.1