Technical Dictionary

Standard 10/100 Base-T – is one of Ethernet standards (standard of creating local (computer) area networks – LAN).

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 standard - wireless network standard, which allows the flow rate up to 11 Mb/s and the maximum range, can be up to approx. 50 m indoors and approx. 100 m outdoors. The range can be increased by means of directional antennas. In Poland, the bandwidth available for this type of network is within the range of 2.4 GHz ...2.4835 GHz which corresponds to 13 channels.

IEEE 802.11g standard - standard of wireless network, which was designed as an extension to 802.11b. It increases data flow capacity to 54 Mbit/s using the same 2.4 GHz bandwidth, which is used in 802.11b. With a high density of users there are problems with interference and adequate data flow capacity of channels, so this standard is replaced, even by IEEE 802.11n.

IEEE 802.11n standard - a standard for a wireless network using multiple antennas in order to increase data transmission rate. It can be used in two frequency bandwidths: 2.4 GHz and 5 GHz with a theoretical speed of up to 600 Mb/s. Currently, in practice it is reaching the speed of approx. 440 Mbit/s.

PoE IEEE 802.3af standard - allows transferring data and power supply by means of a single twisted pair cable. The power of equipment may not exceed 12.95 W. Guaranteed minimum range is 100 m.

PoE IEEE 802.3at standard - allows for data transmission and power supply via a single twisted pair cable for the devices of maximum 25.5 W power 25.5 W. Guaranteed minimum range is 100 m.

A parameter specifying the capability of AC adapter to supply required power to the device, expressed in watts (W) or volt-ampere (VA).

A device must be equipped with an aerial to send and receive radio waves. Many contemporary devices have embedded aerials (e.g. mobile phones). There are many aerial types available on the market. There are also various aerial classifications.

AHD (Analog High Definition) - a standard that allows signal transmission in HD (1280x720), Full HD (1920x1080), 3 Mpx (2048x1536) and 4 Mpx (2560x1440) quality through 75 Ω coaxial cable or twisted-pair cable with video transformers.

The technology developed by Western Digital and implemented in Purple series CCTV optimized HDDs for 24/7 HD video streams.

AC (Alternating Current) - an alternating current, which is characterized by changes in the instantaneous values ​​in a particular frequency while maintaining repeatability. AC takes alternately positive and negative values ​​in sine curve characteristics.

The parameter specifying the battery's ability to energize an electric circuit of a given current intensity for a specified period of time. The battery capacity is expressed in ampere hours (Ah).

Bit rate is the number of data transferred through the transmission channel or saved in memory within 1 s, measured usually in b/s (bits per second) and multiples (kb/s, Mb/s, Gb/s, etc.).

BLC (Backlight Compensation) is the so-called backlight compensation; function of industrial camcorders, which automatically adjusts the level of image brightness in places of strong light source.

BNC (Bayonet Neill-Concelman) - a connector used as the terminal of coaxial cable in the communication of digital and analog TV systems, CCTV cameras, measuring devices 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 is the width of visual field expressed in degrees. This is dependant among others on the type of lens used in the camera, and the focal length of these lens. For lenses used in industrial cameras this is a horizontal angle.

CINCH (RCA) – quite popular and common connector used in a wide range of audio-visual devices, including but not limited to the connection of phonic signals.

The colour of light belongs to the subjective sensations, similarly like sound, smell, taste and touch.

Development of the operation analysis of the SonneTech illuminator and four other models commercially available in a similar price range

A method of reducing data size representing an image based on the analysis of excessive and negligible information.

Description of the configuration of video camera operation modes, APTI series, compatible with GEMINI TECHNOLOGY recorders.

CRI (Colour Rendering Index) – a given light source index which specifies the degree of colour rendering in objects lit with this light. This parameter falls within the range from 0 to 100 Ra; the higher the index, the better the colours of objects are rendered in a given light.

Composite Video, also known as CVBS (Composite Video Baseband Signal) is an analogue video transmission signal (with no sound) which carries information in the standard resolution of 480 i or 576 i (480 lines or 576 lines with interlacing).

dBi - power gain ("G"), expressed in dBi unit informs us by what value in decibels the antenna gain is larger in relation to hypothetical isotropic antenna, assuming that both antennas are supplier with identical power.

dBm – a unit of absolute level of reference to the power of 1 mW (milliwatt); a dBmW expression ought to be used according to the rule but the expression of dBm is exceptionally used here.

dBµV – unit of an absolute level referred to the voltage of 1 µV (microvolt). This unit is commonly used in the radio technique, terrestrial television, satellite television, etc.

Decibel – a ratio of two values expressed by logarithms.

Insulator – gas, liquid or solid – with negligible number of free carriers of electric charge. Owing to this property, it is not a conductor.

DC (Direct Current) - direct current, whose value does not change over time. Contrary to alternating current (AC), charges move always in one direction, by which it is characterized by a constant and changeless direction of their flow.

E.I.R.P. (Effective Isotropic Radiated Power) - effective isotropic radiated power means by the definition of "power that would have to be radiated by a hypothetical isotropic antenna to obtain the same level of signal in direction of maximum radiation of given antenna".

This is the ratio of output power of constant current (given up by the power supply) to input power of alternating current (taken from the power grid), expressed as percentage.

Data and power transmission at the distance of up to 800 m; introduced by Dahua.

Focal length is a distance between an optical focus of an optical system and a cardinal point of the optical system in millimeters and is defined as the lens system ability to focus light. The smaller the focal length, the more the light beams are focused by the optical system.

H.264 - a standard using hybrid coding, this uses a number of innovations and improvements that improves the compression of video sequences, while maintaining unchanged video quality.

H.265 - video compression standard, also called HEVC (High Efficiency Video Coding), the successor of H.264/AVC image coding standard.