| sync signal | The signal employed for the synchronizing of scanning. |
| synchronizing | Maintaining two or more scanning processes in phase. |
| test pattern | - A chart especially prepared for checking overall performance of a television system. it contains various combinations of lines and geometric shapes. the camera is focused on the chart, and the...
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| transients | Signals which exist for a brief period of time prior to the attainment of a steady-state condition. these may include overshoots, damped sinusoidal waves, etc. |
| video amplifier | - A wideband amplifier used for passing picture signals.
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| video band | The frequency band width utilized to transmit a composite video signal. |
| video signal (non-composite) | The picture signal. a signal containing visual information and horizontal and vertical blanking (see also composite video signal) but not sync. |
| y signal | A signal transmitted in color television containing brightness information. this signal produces a black and white picture on a standard monochrome receiver. in a color picture it supplies fine de... señal y/c (ntsc) .; |
| 2d 3d digital noise reduction (dnr) | 2d + 3-d dnr incorporates frame-to-frame noise reduction with spatial noise reduction to produce clear video images with less noise, in low light conditions. noise reduction is critical for video ... |
| 3d digital noise reduction (3d-dnr) | 3d-dnr incorporates frame-to-frame noise reduction with spatial noise reduction to produce clear video images with less noise, in low light conditions. noise reduction is critical for video becaus... |
| proximity card (prox card) | A access control credential that is encrypted with proximity technology and can be read by a proximity reader without having to physically insert the card into the reader, in order to grant a card... |
| ups (uninterruptible power supply) | A battery, attached to a piece of hardware, for example a server, that provides back up power for conducting an orderly shutdown if the server`s normal power supply fails. |
| varifocal lens | A camera lens with variable focal length in which the focus changes as focal length (and, therefore, the magnification) changes. this is different to a parfocal, or "true" zoom lens, which remains... |
| line locked | A camera that is synchronized to the frequency of its ac power supply. |
| ntp server | A central source that can set the time of all network devices. |
| unbalance signal | A composite video signal, transmitted along a coaxial cable, is an example of an unbalanced signal. (see balanced signal). |
| refracted index profile | A description shown in the form of a diagram illustrating how the optical density of an optical fiber alters across its diameter. |
| photo detector | A device at the receiving end of an optical fiber link that converts light to electrical power. |
| pan & tilt | A device that can be remotely controlled to provide both vertical and horizontal movement for a camera. |
| proximity reader (prox reader) | A device that can read encoding on access control credentials such as a proximity card or badge, and sends data to a controller to grant or deny access. |
| magnetic contact | A device that sends a signal when the magnetic field between two monitored access points is broken. |
| fail secure door | A door that automatically locks during a power failure, preventing anyone from entering, but allowing them to exit during an emergency. |
| fail safe door | A door that will unlock automatically in the event of a power failure to permit entering and exiting through the door. |
| blc (back light compensation) | - A feature of modern ccd cameras, which electronically compensates for high background lighting, to give details that would normally be silhouetted.
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| automatic gain control (agc) | A function on the camera (and many electronics) that automatically balances the gain, or volume, of the signal, with the ability to raise the volume if it is too low and lower it if too high. |
| auto iris lens | A lens with an electronically controlled iris, allowing the lens to maintain one light level throughout varying light conditions. |
| ccd image sensor | A light-sensitive imaging device that’s available in many network ip video cameras. the ccd image sensor transforms light into electronic signals and provides strong light sensitivity, to capture ... |
| magnetic lock (mag lock) | A locking device that consists of an electromagnet and a strike plate that works in conjunction with a mechanical lock or latch mechanism, and uses electromagnetic attraction to lock and unlock a ... |
| loop out | A loop out connection enables you to run video stream from a single camera to a separate monitor on every channel. this feature is especially ideal for public view monitors and reception desks. |
| ftp (file transfer protocol) | A network protocol used to transfer files from one computer to another, or between devices connected to the network. |
| ptz (pan, tilt zoom) | A pan-tilt-zoom camera is a camera that is capable of remote directional and zoom control. |
| quad splitter | A product that can display the views from 4 cameras simultaneously on one monitor. it is also possible to select any individual camera for full-screen display on real time monitoring, dependent on... |
| wiegand | A proprietary information coding format used for encoding access cards, key tags, proximity readers, and other access control related products and devices. |
| cat5 cable | A twisted pair type of cable used for network cabling and access control data functions. |
| tight buffered | A type of cable in which the optical fibers are tightly bound. |
| form c contact | A type of relay or switch (often referred to as a single pole double throw or spdt), that contains three connections: normally open (no), normally closed (nc) and common. |
| door switch | A type of switch that communicates whether a door is open (switch open) or closed (switch closed). door contact.; |
| video balun | A video balun (sometimes referred to as a utp balun), enables an installer to replace traditional coaxial cable with cat5 and other forms of twisted pair cabling, to wire security cameras in analo... |
| remote switcher | A video switcher to which the cables from the cameras are connected and which contains the switching electronics. this unit may be remotely located and connected to a desktop controller by a singl... |
| adaptive contrast enhancement (ace) | Ace works to increase contrast locally, and brings out image details to produce crisp, highly-detailed images. |
| digital slow shutter | Allows you to see clear images in extreme low light conditions without the need for artificial illumination. dss technology (also known as `sens-up` or `sense-up`) enables very low light capabilit... |
| mustering | An access control software feature that quickly verifies where individuals in a particular zone at a location for easy tracking and identification. |
| fail safe lock | An electric lock that is locked when the power is on, but automatically unlocks when there is a power failure. |
| fail secure lock | An electric lock that is normally unlocked when the power is on, but automatically locks during power failure. |
| pic-in-pic | An electronic device that superimposes the view from one camera over that of another. |
| input/output (i/o) device | An i/o device facilitates elevator control and multi-door monitoring (in/out only). |
| network ip camera | An ip (internet protocol) or network ip camera captures and transmits live and recorded video images directly over a network. a network camera requires a high speed internet connection, router, et... |
| dynamic ip address | An ip address that changes every time you log in to your computer. this decreases internet security risks but is less reliable than a static ip address. |
| network video recorder (nvr) | An nvr is a hardware box that receives video streams over a lan (local area network) or wan (wide area network) and records the video streams in digital format onto a hard disk. recording and play... |
| onvif compliant | An onvif compliant product conforms to onvif (open network video interface forum) specifications for ip-based security products. onvif defines a common protocol for the exchange of information bet... |
| 3-axis mounting bracket / 3-axis gimbal | Cameras that feature a 3-axis mounting bracket (bullet cameras) or 3-axis gimbal (dome cameras) allow you to mount the camera virtually anywhere (wall or ceiling) and position the camera at any an... |
| twisted pair cable | Consists of two independent wires or conductors that are twisted together in order to cancel out signal interference from external sources. |
| digital day/night | Day/night cameras are designed to work equally well in low light conditions as during the daytime. digital day/night cameras use an electronic filter to block out infrared light during the daytime... |
| day/night (true) | Day/night cameras with true day/night (icr) deliver a sharp image in low light and nighttime conditions. an ir cut filter blocks out infrared light to produce true-to-life color images during the ... |
| regenerators | Devices placed at regular intervals along a transmission line to detect weak signals and re-transmit them. these are seldom required in fiber optic systems. (often incorrectly referred to as `repe... |
| digital noise reduction (dnr) | Digital noise reduction (dnr) technology offers several benefits. first, dnr delivers a cleaner signal, resulting in up to 70% disk space savings - so you can store more video evidence on your har... |
| electric door strike | Door unlocking hardware that’s installed in the door jamb and works with a mechanical lock or latch mechanism. an electric door strike can be connected to a door controller which can power the str... |
| motion detection | Dvr: allows you to pre-define motion detection zones and sensitivity for each individual camera. when motion is detected by the dvr, this will trigger a pre-programmed event (usually a recording),... |
| wide dynamic range (wdr) | Enables the camera to deliver video with near perfect exposure in the harshest of lighting conditions. to accomplish this, wide dynamic cameras use advanced digital processing to capture two image... |
| digital wide dynamic range (d-wdr) | Enables the camera to produce clearer images in less than ideal lighting conditions. d-wdr balances the contrast of light and shadow to improve visibility in dark areas within a scene. |
| multi-streaming | Enables you to set your recording resolution at one rate and watch live video at another rate. |
| flush & surface mount | Flexible 3-part housing construction allows indoor cameras to be flush mounted and outdoor cameras can be either surface or flush mounted. also, the base of our dome housings is conveniently const... |
| d1 | - Full resolution that displays 720 x 480 pixels (ntsc).
- A format for component digital video tape recording working to the itu-r 601, 4:2:2 standard using 8-bit sampling.
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| h.264 compression | H.264 is a stable, proven and widely used compression technology, with unbeatable recording picture quality and a small compression ratio that saves valuable hard drive storage space (5-10 times s... |
| hdcctv | Hdcctv is a standard for high definition analog-based closed circuit television technology. |
| hdmi output | Hdmi supports standard, enhanced or hd video. some dvrs feature an hdmi output which delivers enhanced image clarity with crisp images and enables you to view your security camera video in hd on y... |
| hd-sdi | Hd-sdi technology delivers high quality live hd video over coax with exceptional resolution and image detail. hd-sdi technology delivers image quality that is far superior to analog cctv and provi... |
| door controller | In access control systems, a door controller is a data gathering device that often includes software to make access control decisions. |
| ip-based access control | Ip access control technology utilizes the network to provide secure network-controlled access and management of physical doors at a facility or location. |
| ir illuminator wavelengths | Ir illuminators work with day/night cameras to provide ir illumination for low light environments and enable you to capture video at night. ir illuminators are equipped with varying wavelengths—ge... |
| mimo | Mimo (multiple in, multiple out) is a method of utilizing multiple radio antennas at both the transmitter and the receiver to improve communication performance for wireless network communications.... |
| smart ir array | Most cameras are not able to adjust ir output based on object distance, which often results in a washout for over-ir-exposed scenes, or a darkened image for under-ir-exposed scenes. smart ir allow... |
| dual voltage | Most video security cameras will use either 24 volts ac or 12 volts dc. this video security camera offers dual voltage, enabling you to use either an ac or dc power source, eliminating the worry o... |
| mpeg-4 | - Moving picture experts group, version 4. a form of compression that makes transmission and storage of images easier.
- A further development of mpeg-2 designed for transmitting audiov...
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| multiplex operation | Multiplex operation enables simultaneous live viewing, recording, playback, and backup. this allows you to view live video from your dvr locally or via your network, play back existing recorded vi... |
| http port 80 | Normally this is the http port address that cameras can communicate over. |
| junction box mounting | Outdoor dome cameras feature j box mounting enabling the camera to be directly mounted to an installed junction box, providing faster, easier installation. |
