Posts Tagged ‘ VHS’



CCTV Digital Recorders

Written By:
Wednesday, January 26th, 2011

If you are considering the purchase of a security video system and are unsure as to whether you should purchase a DVR or a CCTV digital recorder, you MUST read this article. In the following text we’ll answer this question and many more about CCTV digital recorders and describe three of Security Camera King’s featured units.

So to answer the original question, DVR or CCTV digital recorder? The answer: They are both the same device; whether it’s called a DVR or CCTV digital recorder, it’s still the same piece of equipment. The terms may be confusing because of the evolution of the video security system.

Originally, video security camera systems were analog systems. The video camera was basically just a small version of a television studio camera that was used to record analog video. The term “CCTV” or Closed Circuit TeleVision was used to indicate the difference between a television studio camera that broadcasted its signal via OPEN radio signals to anyone that wanted to receive it and a video security camera that used a CLOSED circuit to send its signal to a designated device.

Analog systems used video recorders, but they recorded the signals using analog methods on tape, such as VHS or Beta. These analog system recorders were either referred to by the tape type designation or were simply called video recorders.

Current video security systems are digital systems. The recorders that are used in these systems are called Digital Video Recorders or DVRs. Basically the terms DVR, CCTV DVR, Digital Recorders, and CCTV Digital Recorders all refer to the same device, a digital video recorder.

There are several advantages to a digital system as compared to an analog system. CCTV digital recorders can instantly jump or skip to a specific time or date recording. Analog tapes had to played and searched while playing to find a specific segment. Digital recorders also save video in digital or binary format so there is no degradation of the quality of the recorded video over time.

About Security Camera King’s CCTV Digital Recorders
Security Camera King offers high-quality CCTV digital recorders that use the latest digital video technology, offer the most features, and use the latest, most efficient CODEC (more about CODECs in a minute). Our three featured CCTV digital recorders are the Elite Mini DVR, the Elite DVR, and the Ultimate DVR. Each of these units is available in four, eight, and sixteen channel units. (In this case “channel” means input or camera, so this is the number of individual cameras or inputs the DVR can handle.)

All three models of CCTV digital recorder use the H.264 CODEC. CODEC is an acronym for COmpression/DECompression. Digital video security systems create digital video files which consist of nothing more than several digital photographs taken in succession in a short period of time. High-quality fluid digital video is often taken at a rate of 29.9 pictures per second or frames per second or fps.

Consider the potential size of a file for one digital photograph; now imagine if you took 30 of these per second. In 60 seconds you would have an uncompressed digital file 1800 times the size of one picture. This size ratio is far too big for even the fastest processors to handle, so the CODEC is an algorithm that is used make this files much easier to handle and store by shrinking their size without sacrificing quality. The H.264 is the latest, most efficient digital video CODEC available.

All three of Security Camera King’s CCTV Digital Recorder models feature an embedded Linux operating system and Internet Protocol (IP) ready features that include internet networking, e-mail alert notification, and access via one of several varieties of smartphones. Our CCTV digital recorders are standalone systems; they can operate without the use of a personal computer (which could be vulnerable to viruses, hacking, and other invasions).

In addition, all of our featured CCTV digital recorders have HDMI, VGA, DNC video outputs with a display resolution of 720 P. This means that more than one monitor can be used with the unit at a time. In fact, with the included Matrix output you can pick and choose your monitor display options.

Our CCTV digital recorders are easy to setup and operate. Their software is a mouse-based point-and-click Graphical Users Interface with an On-Screen Display. The operation is so simple that there is even an included infrared remote control.

For additional information about our CCTV digital recorders, please contact one of our security experts.

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Camera Video Monitor

Written By:
Tuesday, January 25th, 2011

A camera video monitor is used to view either the field of vision being captured by one camera or by a series of cameras in a digital video security system. Digital video camera monitors have made great strides in technological improvements in the last several years producing a higher quality, lighter, and more adaptive piece of digital video security system equipment.

It’s important to understand a little about the history of camera video monitors in security camera systems and how they used to work compared to how they work today. Let’s take a closer look at a camera video monitor.

First, we should identify the three main components of a video security system. That includes one to several video cameras, a video recorder, and at least one camera video monitor. Note that the word “digital” did not appear in the previous two sentences because we are referring to the older analog video security camera systems.

The older analog video camera systems consisted of analog video cameras which were basically miniature version of cameras used in an average television studio. However, since television cameras “broadcasted” their signal to the general public, security video cameras were often (and still maybe today) referred to as Closed Circuit Television or CCTV. The circuit is closed because the security system camera sends its signal to the video recorder and monitor, a closed circuit, rather than broadcasting it for unrestricted access.

The recorders used in these older analog systems were usually analog video tape recorders such as a VHS or BETA recorder and the monitors were basically miniature televisions. In contrast we use digital video security cameras, Digital Video Recorders or DVRs and high resolution camera video monitors with LCD, Plasma, or LED displays today.

The older “tube” type television camera video monitor and the analog video camera, worked with video in terms of “lines of resolution.” Without getting overly technical, the quality of these displays was much lower than today’s typical Plasma, LCD, or LED camera video monitor since the tube projected the image in alternating “lines.” Today the image is made up of pixels, extremely small dots or squares that can provide a much greater (or finer) resolution, and therefore a much higher quality display image.

Often times, older analog cameras would require an individual camera video monitor for each camera. Today however, depending on the size and resolution of the display, all of the cameras within a system can be displayed on one monitor. In fact, the digital video security systems used today do not require a camera video monitor to operate. A monitor is used to set the system up initially, but may be removed after the initial settings have been made. Yet, the monitor is still the component with the highest use since it is used to view live or recorded video in one way or another.

Of the three types of camera video monitors used today, the LCD is the most prevalent. Since video security systems have become digital, they have gained access to many of the technological improvements of personal computers. Therefore, monitors that are currently used for personal computing may also be used for digital video security systems with one provision; the monitor must have the capability to display using the output connectors for the system.

Personal computer monitors typically have VGA (Video Graphics Array), DVI (Digital Video Interface), or HDMI (High Definition Multimedia Interface) connectors for video input. Security digital video cameras however still utilize RG-59 coaxial cable with a BNC (Bayonet Neill-Concelman) connector. Most computer display monitors do not have BNC inputs; most security camera video monitors DO have BNC inputs.

This is important because if you choose to place a monitor on a single or specific camera, chances are it will need a BNC input connector. While most DVRs have BNC connectors for the camera inputs, they usually have several different output types to the monitor (VGA, DVI, and HDMI for example). When you purchase a camera video monitor for your security system, just make sure the outputs of the cameras and/or DVR matches the input connections of the monitor.

Security Camera King offers a wide variety of camera video monitors available for purchase. What’s more is that we also have BNC to VGA Monitor Converters available which allows you to view your video security camera with a BNC connector on a VGA monitor. In addition we also have monitor mounts available. For more information, talk to one of our security experts.

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