Cctv Audio
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More Great Information on Cctv Audio:
Functioning of CCTV by Rohan shah
CCTV (Closed Circuit TV) uses one or more video cameras to transmit video and sometimes audio images to a monitor, set of monitors, or video recorder. The difference between CCTV and standard TV is that standard TV openly broadcasts signals to the public. CCTV is not openly transmitted to the public. CCTV uses either wireless or wired transmission to send the broadcast from the video cameras to the monitor(s) or recording device. Most CCTV systems are used for surveillance, which can include security monitoring, spying, or safety monitoring.CCTV systems have become extremely popular over the last few decades as the technology has improved and become more affordable. The majority of CCTV cameras in use today are usually for surveillance and security purposes. CCTV systems can be found in almost every bank, casino, mall, and large department store. In fact, CCTV systems have become so affordable, most smaller mom and pop stores also have CCTV systems in them for security purposes.
There are many types of CCTV cameras. They can be categorized by the types of images they are able to capture, the amount of frames they can take per minute, the type of connection to the monitor or video recording device, whether they are able to move position, and special functions they can provide.
Types of Images: CCTV cameras generally take both black and white or Color Video images. In addition, many CCTV cameras even have night vision capabilities that allow a CCTV camera to view and record low light images using special technology.
Frames per Second: Frames per second is the amount of full frames that a video camera captures and sends to a recording device or monitor per second. While most CCTV camera systems easily capture 30 or more frames per second (30 fps is considered real time), the amount of video tape or digital storage would be enormous to record every moment of everyday. For most stores, speeds of 1 to 6 frames per second are more than enough to catch and record a perpetrator committing a crime.
Cameras with Special Accessories: Certain CCTV cameras have special functions that are made for specialty uses. For instance, there are extremely small surveillance cameras that are used for spying (Nanny Cams), night viewing, are vandal resistant, and that are specifically made for indoor or outdoor uses.
Fixed cable connection means that the camera is physically connected to the monitor or recording device via a cable. Coaxial cables that are similar to normal home TV cables are usually used. Lengths come in 25, 35, 50, 100, or 500 feet. As the distance increases, signal quality decreases. For distances longer than 100 or 200 feet, purchase higher quality coaxial cables such as RG59 coaxial cable for distances up to 600 feet and for distances more than 600 feet, but less than 2,000 feet, purchase CAT5 cable.
CCTV is most commonly used for surveillance. Most major institutions, such as banks or schools, have CCTV networks to reduce the need for human security. Prisons use CCTV for monitoring behavior from a central location in addition to regular patrols. Video taken with CCTV can be recorded and reviewed later.CCTV has other practical applications beyond surveillance and CCTV networks don't necessarily feature security cameras. Any kind of on-site video technology uses CCTV, such as a video conference that is only accessible for a select audience.
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Article Source: http://www.earticlesonline.com/Article/Functioning-of-CCTV/1331735
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