Posts Tagged ‘ Camera Systems ’

CCTV Camera Systems

Thursday, March 17th, 2011

These days there are more Closed Circuit TeleVision or CCTV camera systems than applications for their uses.  If you are interested in such a system, it will serve you well to do some research before venturing out to make your fist purchase.  At Security Camera King, we encourage you to shop around, because we know that we offer the highest quality systems and the best possible prices.  After you’ve looked at other offers, we’re sure you’ll come back to us to make your final purchase.

You may be asking what is meant by the term “CCTV Camera System.”  A CCTV camera system is simply a digital video camera system that normally includes a Digital Video Recorder and a display monitor.  Today’s systems are entirely digital and the systems are component systems, meaning that when putting together your system, you can choose different pieces of the system that have different functions to tailor fit the system to your needs.

First a little history.  Closed Circuit Television or CCTV got its name way back in the days of analog transmissions.  A typical video security system was referred to as a Closed Circuit system because the cameras did not broadcast their signals to the open public.  These cameras were basically smaller versions of the cameras used in television studios.  However, television studio broadcasts were amplified and distributed to the open public (i.e. anyone that had a receiver or television).

CCTV on the other hand, consisted of a circuit of one or more cameras, each connected to a video recorder by means of a video transmission cable.  Analog CCTV camera systems recorded their video on magnetic tape, usually VHS or Beta format.   The used tape had to be ejected and a new one put in place every few hours or a “loop” tape was used.  When a loop tape reached the end of the tape, it simply continued over again on the beginning of the tape, re-recording over the original.

Today, CCTV camera systems are digital.  Instead of sending their video transmissions in analog type signals, they are sent in binary or digital form, usually in the form of bits or bytes, the same sort of digital segments used by personal computers.  The camera data is compiled into a digital video file which can either be stored on a hard drive disk or other storage media and/or viewed on a digital monitor.

Since the data is digital, many of the individual electronic components of a modern CCTV camera system are the same things used in personal computing.  For example, the computer Hard Disk Drive or HDD is the major constituent of the DVR storage.  A computer processor, much like the Central Processing Unit or CPU of a personal computer compiles the digital video files, controls and coordinates camera activity as well as playback and other DVR functions.

Since the original video security systems were analog and were called CCTV camera systems, there may be some confusion or crossover that exists today when describing digital video systems.  For example, analog CCTV cameras displayed their video on older CRT (cathode ray tube) type television monitors.  The CRT monitor displays a picture by rapidly projecting horizontal lines across the screen; the more horizontal lines per fixed vertical area, the greater the detail or resolution of the video.

Digital video is not displayed in horizontal lines, but as a series of horizontal and vertical dots called pixels.  These pixels may be circular or square in shape.  Generally speaking, the more pixels in a video for a fixed area, the greater the detail of the video because the dots are much smaller.  This allows for finer detail in the image.

So where’s the confusion?  Today you may still see CCTV camera systems that describe their clarity or detail or resolution of the camera in terms of Televsion Lines or TVL.  Yet other cameras may describe their resolution in terms of pixels.  For more information on determining the equivalencies of resolution for these systems see the articles in our knowledge base.

Since most of our monitors that are manufactured today are no longer CRT type but are more commonly LCD (liquid Crystal Display) or LED (Light Emitting Diode), it would see logical that over time, the TVL descriptor will eventually lose out to the more familiar digital “pixel” resolution (for example 720 X 340 pixels), but for the time being, it is well enough that you are aware that the difference exists.


Camera Security Systems with Cameras

Monday, August 16th, 2010

Digital video camera security systems with cameras are the one of the most popular anti-theft, alarm, and surveillance systems in use today. Innovative technology including advancements in the digital video camera industry and computers have made these security devices not only versatile for use just about anywhere, but low in cost to be so economical that businesses and residences alike are using them for protection.

Camera security systems with cameras are basically component systems; they are individual pieces linked together to operate as one system. This produces several advantages for the system as a whole. First, individual parts or devices of the system can be made by different manufacturers. In addition, these components can be purchased so that each individual part is highly customized to serve a specific need, while maintaining the integrity of the total system. This allows “mix and match” system building.

Typical digital video camera security systems with cameras contain three major components: 1) Cameras; 2) Digital Video Recorders or DVRs; and 3) Monitors. Keep in mind that since these are component systems, every system can vary in the number of basic and additional components used. For example, camera security systems with cameras used for industrial areas may contain 16 or more cameras whereas residential camera security systems with cameras may contain only two or three.

Further more, each component type of the system can be different to accommodate the needs of the user. That is, a residential system may have 5 cameras, with each camera being of a different type or for a different function. One camera may be an outdoor camera with day/night vision that monitors a driveway, another may be an outdoor camera with day/night vision and audio recording for monitoring the front door, and a third camera may be an indoor camera that monitors the living room and hallway areas. A fourth camera may be an infrared night vision camera used as a baby monitor and a fifth and final camera may be a motion detection activated camera for protecting a home office. All of these cameras can be used together easily in tandem even though each one may be a different type and model.

In fact there are many features and/or options available for each component of the system. The following is a partial list of the most common features/options available for the components of camera security systems with cameras:

• Box, dome, and bullet shaped cameras
• Indoor/outdoor cameras
• Extremely sensitive day/night vision cameras that use very little visible light
• Night vision infrared cameras that use near infrared radiation to illuminate their targets (this “light” is invisible to human eyes)
• “Wireless” cameras that send their video signal via radio waves instead of coaxial cable
• Cameras that record both video and audio
• Internet Protocol or IP ready cameras that can be immediately connected to and networked via the internet
• Cameras that capture high quality black and white or full color video
• Pan-tilt-zoom or PTZ cameras that can vary the position of the camera to increase its field of view — when used with additional programming for the DVR unit these cameras can even track or follow a moving object
• Hidden or disguised camera types for covert monitoring

Digital Video Recorders
• Various storage capacities are available from Gigabytes to Terabytes — the larger the storage capacity the longer the recording time capability and/or the larger the number of cameras being recorded
• Flash card digital recorders are available for small, light-weight portable digital video recording
• Various COmpression/DECompression utilities or CODECs are available for creating digital video files
• Internet ready DVRs that can be networked using the internet
• DVRs that can handle 4, 8, 9, or 16 cameras at one time

• These days, most monitors are the equivalent to LCD computer monitors so they can vary accordingly in size, type and resolution
• Small individual camera monitors are also available
• Individual use wireless monitors such as those used as baby monitors

As you can see, camera security systems with cameras have a tremendous variety of features and additional options that make them incredibly versatile. These features combined with the component functionality of the system make them useful for the largest business as well as small residential use. In addition, technological advancements have resulted in economical pricing making these systems affordable for just about anyone.