2D-DNR noise reduction is based on the analysis of individual video frames. 3D-DNR also analyses the differences between subsequent video frames to adapt the pixels and improve image fidelity. 3D-DNR technology provides better noise reduction, however it tends to blur the moving objects.
4K UHD – is a resolution standard developed by DCI (Digital Cinema Initiatives), with an image size of 3840 x 2160 pixels at 16:9 aspect ratio. The resolution is four times higher than the commonly used Full HD (1920x1080) resolution.
802.11ac wireless network standard operates at 5 GHz band and uses Multi-User MIMO (MU-MIMO) and beamforming technology. Along with a wider spectrum it offers speeds up to 1.3 Gbps (using three antennas).
IEEE 802.11b – is a wireless network standard providing bit rates of up to 11 MPs and a maximum distance up to approx. 50 m indoors and up to 100 m outdoors. The maximum distance can be increased with directional antennas. In Poland, the band available for this network is 2.4 GHz...2.4835 GHz corresponding to 13 channels.
IEEE 802.11g – a wireless network standard designed to extend the capabilities of 802.11b. The standard increases bandwidth to 54 Mbit/s using the same 2.4 GHz band as 802.11b. However, at high user densities there might be some issues with interferences and bandwidth, and the standards is replaced by IEEE 802.11n.
IEEE 802.11n – a wireless network standard using multiple antenna for increased data transfer rates operating at two frequency bands: 2.4 GHz and 5 GHz with a theoretical data transfer rates up to 600 Mb/s. In practice, the throughput of approx. 440 Mb/s can be achieved.
AGM (Absorbent Glass Mat) battery is a maintenance-free battery which, unlike a traditional lead-acid battery, has the electrolyte fully absorbed (bound) in special fibreglass mats.
AHD (Analog High Definition) - an HD (1280x720), Full HD (1920x1080), 3 Mpx (2048x1536), 4 Mpx (2560x1440) and 5 Mpx (2592x1944) signal transmission standard via a 75 Ω coaxial cable or twisted pair with video baluns.
AC (Alternating Current) – an electric current which periodically reverses direction at a specific frequency. The usual waveform of alternating current is a sine wave.
A parameter defining the ability of the battery to power an electric circuit with a specific current for a specific time. The battery capacity is rated in ampere-hours (Ah).
A bit rate refers to a number of bits transmitted via a transmission channel or stored in the memory per second, usually measured in b/s (bits per second) or its multiple (kb/s, Mb/s, Gb/s etc.).
BLC (Backlight Compensation) is a mechanism by which a CCTV camera can compensate for backlight by enhancing automatic exposure control in intense lighting conditions.
BNC (Bayonet Neill-Concelman) – a connector used as a terminal of a coaxial cable in digital television, analogue television, CCTV cameras, measuring instruments and computer networks.
Attenuation loss, expressed in decibels per 100 m [dB/100m], determines the ratio of signal power at the beginning of the transmission route (cable) to signal power at a specific distance from the beginning of the transmission route (e.g. at 100 m).
This article is a quick guide for CCTV network admins collecting information about the login methods for recorders and IP cameras and restoring the default settings of devices available in DELTA offer. See more...
The privacy zones are freely configurable image areas excluded from monitoring. The image in the privacy zone is blocked by an electronic mask - usually rectangular, occupying a strictly defined position, or other polygons, depending on the camera model.
CRI (Colour Rendering Index) – is an index indicating how accurate a light source is at rendering colour of an object illuminated by that light source. CRI is a scale from 0 to 100 and the higher the index the better the object colours are rendered in a specific light.
Composite video, also referred to as the CVBS (Composite Video Baseband Signal) is an analogue video transmission signal without audio which contains image data in standard resolution of 480 and 570 or (480 lines or 576 lines interlaced).
dBi - antenna gain (‘G’) expressed in dBi shows a value in decibels by which the antenna gain is higher than that of a hypothetical isotropic antenna assuming that both antennas are fed with the same power.
DC (Direct Current) – a direct current whose value does not vary in time. Unlike alternating current (AC), in direct current (DC), the electric charge only flows in one direction, and the current is constant and unidirectional.
E.I.R.P. (Effective Isotropic Radiated Power) - is an equivalent effective isotropic radiated power defined as a power that would have to be radiated by a hypothetical isotropic antenna to achieve identical signal level in the direction of maximum radiation of a specific antenna.”
EIS – electronic image stabilization is carried out by the camera’s image processor. The system minimizes blurring and compensates for camera shake often caused by the external factors, for example wind. See more...
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