Glossary
120
Glossary
Overview of specialist terms
1080i
HDTV image signal with 1080 pixels and interlaced dis-
play.
16:9
Cinematographic aspect ratio on widescreen displays.
720p
HDTV image signal with 1280 x 720 pixels and progres-
sive display.
CIF
Common Intermediate Format
Originally planned for converting PAL to the NTSC stan-
dard. CIF corresponds to a video resolution of 352 x 288
pixels (2CIF = 704 x 288 pixels; 4CIF = 704 x 576 pixels).
CINCH
Socket type used for analogue audio or CVBS video sig-
nals.
CVBS
Colour, Video, Blank and Sync – The simplest variation
of video signals (also known as composite video). The
image quality is comparatively low.
DDNS
Dynamic Domain Name System entry
Network service which provides and updates IP ad-
dresses of its clients in a database.
DHCP
Dynamic Host Configuration Protocol
Network protocol which allows the automatic connection
of devices (clients) in existing networks. DHCP servers
(e.g. Internet routers) automatically assign the IP ad-
dress, network mask, gateway, DNS server and WINS
server (when required). Only the automatic acquisition of
IP addresses must be activated for the client in this case.
Domain
Name used for the identification of websites on the Inter-
net (e.g. www.abus-sc.de).
Dual Stream
Dual stream is a video transmission method. A high-
resolution recording and lower-resolution transmission
are made over the network, for example. The main
stream has a 4CIF resolution and the sub-stream has a
CIF resolution.
DVR
Digital Video Recorder – A device used for recording dif-
ferent video and audio sources (analogue, digital). The
data is compressed for recording and saved on hard disk
drives (HDD).
H.264
(MPEG-4 AVC) – Standard method for the highly-efficient
compression of video signals. Used on Blu-ray discs or
video conference systems, for example.
HDD
Hard Disk Drive
Digital data storage on computers or DVRs.
GIGABYTE
Unit of capacity for storage media (HDD, USB, SD/MMC
cards).
HDVR
Hybrid DVR – DVR used for recording analogue cameras
and network cameras.
http
Hypertext Transfer Protocol
Method for transmitting data across networks. Primarily
used for displaying websites in a browser.
INTERLACED
Method for improving the picture quality of a video signal
without consuming extra bandwidth (scan pattern on
every second line).
IP address
An address in the computer network based on the Inter-
net protocol. Allows different devices to identify them-
selves in a network so that they are accessed specifi-
cally.
JPEG
Compression method for photo images with minimal loss.
Most digital cameras save photos in JPEG format.
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