Closed Circuit TV (CCTV) uses one or more video cameras to send video images and
sometimes audio images to a monitor, set of monitors or video recorder. It is different from a standard TV because a standard TV openly broadcasts signals to the public. CCTV uses wireless transmission or a wired transmission to send the broadcast from the video cameras to the monitors or recording device. Most CCTVs are used for surveillance and security purposes.
There are various types of CCTV cameras which are classified according to the type of images they capture, the amount of frames they can take per minute, the type of connection to the monitor or video recording device, and the special functions they provide. CCTV cameras generally capture both black and white or color video images. Many CCTV cameras are equipped with night vision capabilities which allow them to view and record low light images using special technology.
Frames per second refer to the amounts of full frames that a video camera captures and sends to a recording device or monitor per second. Most CCTV cameras can capture 30 or more frames per second. Speeds of 1 to 6 frames per second can catch and record perpetrator committing a crime.
The pan tilt zoom (PTZ) cameras are examples of New York CCTV cameras that allow a person controlling the surveillance of an area to move the camera remotely. Moveable cameras allow the person monitoring it to move the camera by panning from right to left, tilting up and down, and doing a close-up zoom from a tight angle to a wide angle. CCTV cameras also have special functions which are designed for specialty uses. For instance, small surveillance cameras used for spying are made for night viewing and for indoor and outdoor uses.
There are two types of connections for CCTV cameras: fixed cable and wireless connection. A CCTV camera with a fixed cable connection is connected to the monitor or recording device via a cable which is similar to home TV cables. A wireless connection allows CCTV cameras or internet surveillance cameras to be placed anywhere.
Wireless Long Island security cameras send video images to a monitor or DVR (digital video recorder). They also require 2.4 Gigahertz frequencies to transmit images through most walls and obstacles. Most wireless CCTV can send data to a range of about 200 feet.