Posts Tagged ‘ What is HDCVI?’



Why the new HD-CVI technology may be the future of security camera systems.

Written By:
Tuesday, April 22nd, 2014

As video technology continues to improve with time, it makes sense that the public continues to express a growing interest in security cameras that can reliably provide better video quality then was possible in the recent past. Here at Techpro Security Products we are constantly upgrading the CCTV products that we offer our customers in order to stay on the cutting edge of the industry. This also means that we can provide an array of equipment that lets you select the surveillance solution that best fits your budget and security requirements. Because of this effort we are excited to now be offering HD-CVI (High Definition Composite Video Interface) surveillance cameras and DVRs to our customers.

HD-CVI complete security camera system.

Until very recently, IP cameras were the most common equipment that someone purchased when they wanted to get megapixel quality video from their security camera system. This type of network based CCTV system still offers the highest resolution available today but the new HD-CVI is closing the gap. There are also some issues with installing IP cameras which mean that installing them can be a little more challenging.

An issue that has to be faced when someone is doing an installation with IP cameras is the fact that they require a significant amount of bandwidth. You may face this issue both inside and outside the network where they’re installed. This can occur inside the network because the video signal is being transmitted from all of the cameras to the recording device or NVR though the internal network. This significant bandwidth usage can also be a problem if you are trying to remotely connect to the NVR from outside network where it’s installed, unless your Internet service provider is supplying you with high upload speeds. Configuring these IP cameras to work within the network where they’re installed can also be a daunting task for anyone that doesn’t have a good understanding about how networks operate.

The HD-CVI technology lets the camera send video to the DVR for recording as a digital signal. The unusual part is the fact that the video signal does not need to be transferred through a network. This allows you to record megapixel quality video through any of the cabling options that have been typically used with analog security cameras installations for decades.

HD-CVI Cable Options

With this type of CCTV system you are able to use RG-59 or RG-6 (these are types of coaxial cable that is commonly with analog security cameras), standard CAT5 cables with baluns or prefabricated “plug and play” cables to carry the video signal from security cameras to the recording device. RG-59 will offer you the highest quality video; while CAT 5 cable will offer video that is approximately 5 to 10 percent lower quality then RG 59 and the prefabricated “plug and play” cables offer about 5 to 10 lower video quality then the CAT5. Most professional CCTV installers will use a type of wire that is called Siamese cable for most security camera installs. This cable consists of RG 59 and two 18 gauge wires for power transmission all joined into one wire by a tough insulation wrapped around the exterior of these cables.

This new type of surveillance system lets you run the cables for the cameras a longer distance from the DVR then either IP cameras or the HD-SDI technology will allow. Both IP and HD-SDI cameras are limited to transmitting video a distance up to 333 feet, while using the new HD-CVI technology allows you to transmit video up to 1,500 feet. It’s important to note that the distance that you can run power for these cameras is still subject to the same restrictions as the other types of cameras that are currently on the market. Once the power for a camera has traveled over 100 feet then the voltage begins to drop off. If the power goes far enough beyond the 100 feet then the voltage will drop to the point where the camera will not get enough power to operate correctly. This is true with either AC or DC power supplies.

HD-CVI is low cost

One aspect of this technology that is sure to capture the attention of experienced installers and the end users doing their first install is the fact that the cost is incredibly low compared to other existing video transmission formats. Even though this technology offers such high video quality, the price is very close to the older analog security camera systems and it’s significantly less expensive than either an HD-SDI system or a network based IP camera system. An HD-CVI security camera system will also save you a considerable amount of time and money because no matter what type of cable you use with them, they are able to transmit video, audio and the signal for controlling the camera’s OSD (or On Screen Display) over a single line.

HD-CVI Resolution

These cameras can offer 720p resolution right now but a 1080p version of the HD-CVI cameras are scheduled to be released around the end of the year. When these 1080p cameras some out they will be compatible with the current HD-CVI DVRs. The maximum resolution that analog security camera technology are limited to is 960 x 480 pixels. Once the 1080p cameras become available then a HD-CVI security camera system will offer 450 percent higher resolution then the maximum resolution of the older analog technology is able to provide. A 1080p camera actually captures video that is 1920×1080 pixels.

720p Example

HD-CVI is also something to consider if you want to upgrade an analog system to the point that it will give you megapixel quality video. Upgrading to this type system will allow you to simply replace the cameras and the DVR. The existing power supply and wiring will work great with these upgraded devices. Not only will upgrading your system in this way save you the cost of buying these items again but it will also be much easier and quicker, since running the wiring for a security camera system is the most labor intensive part of the process.

This new technology represents a substantial breakthrough in security camera technology and it is not widely available yet. As a matter of fact, SecurityCameraKing.com is one of the few places that you can purchase it the United States. Below is a link where you can find these new products.

http://search.securitycameraking.com/psearch/svc/search.php?uid=4&q=cvi

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The Science Behind HD-CVI

Written By:
Friday, April 4th, 2014

HD-CVI System

High Definition Composite Video Interface (HDCVI) is a brand new video transmission applied science in the CCTV world. This technology allows high definition video footage to be transmitted over coax cable at considerably longer distances than network based cameras. The overall cost of the HDCVI cameras are lower than most network cameras as well to further enhance their staying power.

The main feature that makes HDCVI cameras images so vibrant is the signal itself. The HDCVI technology modulates the image signal then transmits by using both base-band and quadrature amplitude modulation. Base-Band is a word that details signals that range of frequencies from zero hertz to a cut-off frequency or highest frequency signal. Digital base-band signal transfers the digital stream over baseband channels, normally an unfiltered wire such as coax.

Baseband Transmission

Quadrature amplitude modulation differs in implementation as QAM uses both analog and digital modulation. It can use either two analog signal messages or two digital streams. This is accomplished by modulating the amplitudes of the two carrier waves. QAM high efficiencies can be achieved by setting size limited by the noise for communication channels. Another way of describing QAM is the amplitude of the two carrier waves are 90 degrees out of phase with each other in quadrature. Making the way the signals are carried equivalently viewed as both while being phased modulated into a single carrier.

Quadrature

This new way to apply the science QAM effectively separates the brightness signal and hue to enhance image quality. Also the separation of the signals diminishes the cross talk or external radiation that interrupts the signal.

Currently the two camera types available are 1920H and 1280H which translates to 1080P and 720P respectively. These cameras are using a technology that is actually a group of technologies used as one called Auto Signal Compensation or ASC. A video signal such as the standard NTSC (National Television System Committee) has different synchronization pulses used for the receiver scan timing. The features of a waveform are in the details of the synchronization. Synchronization occurs in the video lines of the sequential scanning of horizontal lines starting in the upper left corner then going right until all lines are scanned. The operation will happen hundreds of times depending on how many TV lines. Once modifications of the horizontal sync are complete vertical synchronization waveforms are initiated. The actual shape of the wave form is affected in this application, ultimately giving an extremely vibrant color display. If you take the anti-interference ability of the HDSDI science and compare it with the HDCVI, the HDSDI is fairly poor when operating in a high frequency radiation areas. Radiation by definition is electric magnetic waves. This is considerably different than nuclear or thermal radiation. Electro-magnetic waves come from all electric devices. A standalone air-condition unit is a perfect example. The AC compressors inside puts off enough electromagnetic interference to scramble the video signals traveling down the coax cable should the lines be too close. By separating carrier waves and changing their shape the signal becomes resilient to interference.

Another aspect of the signal usage was a realization that other signals can be embedded in the blanking zone. Blanking interval was originally designed to blank out the receiver to allow time for retrace in the receiver.

It’s first implementation was the closed captioning system in TV for example.

Closed_Caption

We can now use the vertical blank for something else called two-way data communication. The end to end transmission can support features for PTZ control. Other non PTZ cameras that support RS485 control can be used. These cameras’ OSD menu can be accessed without having to run extra control wiring same as the PTZ. You will no longer have to pull extra cable for PTZ control either. Originally installers would use Cat5 cable to get around that old limitation on the analog systems. I would use a pair of wires for video. Another pair of wires for RS485 control. Then splice the remaining 2 pairs to have 2 wires for positive and 2 wires for negative on power supply. That is a nice little work around, but at long distances that does not work as single strand wire is not thick enough to carry the amps needed. With the new implementation of ASC it makes communication for control available.

HDCVI equipment is similar to HDSDI equipment in that you can you use RG6 or RG59 and not have any problems. You can use you standard connectors without any special requirements or the need to find obscure vendors for the connectors. Using standard cabling and connectors will allow for the same level of ease for installation as legacy CCTV cameras.

Comparing HDCVI to HDSDI both technologies can transmit an image at resolutions of 1080P and 720P. For distance of signal transmission the HDCVI has an enormous advantage over HDSDI. HDSDI can reach about 100 meters or 320 feet. HDCVI can transmit up to 500 meters or 1600 feet. To put those numbers into perspective HDSDI can have the camera at one end of a football field and the DVR at the other end. HDCVI can reach 5 times as far. If you have a huge piece of property you need to get High definition cameras HDCVI is the way to go. Of course keep in mind power for the cameras are subject to the same restrictions of older technologies when it comes to alternating or direct current electricity.

HDCVI technology uses a peer to peer type of transmission. This means there is a continuous transmission with no creation of packets such as in IP based cameras. IP cameras are subject to the normal rules of data transmission. That means packets are created then transmitted over the Ethernet cable. The packets need to arrive in the correct sequence and be spaced evenly apart.

Packets

Issues with network congestion, configuration mistakes, and improper queuing for the data stream will result in choppy and degraded video display. Those issues are inherent of an IP based system. There are extra steps an installer can take to reduce the jitter problem, but that takes advanced knowledge of the cameras themselves as well as advanced knowledge of networking in general.

To recap the HDCVI cameras do operate much better than IP camera systems or HDSDI systems. The HDCVI provide mega pixel quality like the HDSDI and IP cameras. They are not subject to the same outside interference the HDSDI devices are or IP systems. HDCVI have able to go 5 times the distance for video transmission than HDSDI or IP. The new technology is as simple to use as legacy equipment is. Lastly you get Mega pixel quality at analog camera prices.

If you would like to know more about HDCVI, how it compares to IP and Analog and how to connect the system together, check out our What is HD-CVI page.

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How to Connect HD-CVI Cameras to an HD-CVI DVR

Written By:
Wednesday, March 19th, 2014

HD-CVI is a brand new CCTV technology that delivers High Definition Video over Standard Coax Cable. In this article, I will explain various options on how to connect your HD-CVI Cameras to your HD-CVI DVR. All of the products I will show are available at http://www.securitycameraking.com.

The first option is the one we recommend the most.

HDCVI Wiring Option 1

As you can see in Option 1 this configuration utilizes Siamese Cable with a Distribution Box. The great thing about HDCVI (High Definition Composite Video Interface) as stated above is that you can achieve up to 720p resolution over Analog Coax Cable. To power the HDCVI cameras in this configuration you will need a distribution box. The one in this picture is a 4-channel distribution box. The 18-2 wire coming from the Siamese Cable connects into the distribution box and the other side connects into the female power lead, which then plugs into the power port of the camera. To see and record the video, you will connect the RG59 part of the Siamese Cable to the HDCVI Digital Video recorder (DVR) via a BNC Connector into the video input jack. The other side of the cable will connect to the BNC port on the camera via another BNC Connector.

In the next option, you will see the same sort of configuration except with a power plug instead of a distribution box.

HDCVI Wiring Option 2

In this option, you will use a 1amp minimum power supply to run power to one camera. If you have multiple cameras, either you can use separate power supplies or you can use 4-channel Output Switching Supply if you are powering up to 4 cameras, or an 8-Channel Power Supply for powering up to 8 cameras. In this configuration above for power, you will need a male power lead to connect to the power supply, attach the 18-2 wire from the Siamese cable, and attach the other end of the 18-2 into a female power lead. Then, just plug the power lead into the power port on the HDCVI camera. Keep in mind you will do this for each camera, even if using a 4-channel power supply. For video, the connections are the same as in option 1.

The next option is the simplest option but not highly recommended (although it does work and is good for novices).

HDCVI Wiring Option 3

In this option, we use a Plug and Play Power/Video Cable. There is no special wiring involved. For power, just plug the power supply into the power adapter of the plug and play cable, and then plug the other side of the cable into the power port of the HDCVI Camera. For Video, connect the BNC from the cable into the Video Input on the HDCVI Digital Video Recorder, and attach the other end to the BNC port of the camera.

In the next configuration the diagram consists of the same setup as above except with a distribution box as the power supply.

HD-CVI Wiring Option 4

In this configuration showing how to connect an HDCVI Camera to an HDCVI DVR, power is generated through a power distribution box. To send power to the camera using a plug and play video/power cable as shown above from the distribution box, you will need a female power lead. Connect the two wires of the female power lead to the port in the distribution box and connect the other end of the female power lead into the power port of the plug and play cable. Then, attach the other end of the plug and play cable to the HDCVI Camera. For video, plug the BNC from the cable into the HD-CVI Digital Video recorder and the other end into the camera.

In the next option, we move on to using Cat5e/Cat6 Ethernet cable for video and power transmission.

HDCVI Wiring Option 5

The great thing about High Definition Composite Video Interface (HD-CVI) is that video can be streamed through either Standard Coax Cable or Ethernet Cable. In the above diagram, the power starts with a plug-in power supply. In order to go from the power port on the power supply to the Ethernet cable, you will need to use a passive video and power balun. The power supply plugs into the power port of the balun and then the Ethernet Cable plugs into the RJ45 Jack of the Balun. Then the other side of the Ethernet cable is plugged into the RJ45 jack of the camera side Balun, and the camera’s power port connects to that balun. For video, The BNC from the Balun connected to the power supply is connected to the HDCVI Digital Video recorder and since the Ethernet cable is already plugged into the baluns, you just need to connect the camera’s BNC port to the other Balun.

In the last option in this article, we use the same configuration except with a distribution box.

HD-CVI Wiring Option 6

In this configuration, things get a little tricky. Instead of just plugging in the Ethernet cable using RJ45 Jacks, you will be working with the raw wires that are inside the Ethernet cable. You will use two of the wires for power and two wires for video. Whichever two wires you use, you have to make sure you use the same two wires on both ends.

For the power, connect the first pair of wires to the distribution box. On the camera side, connect those same two wires to a female power lead, and then attach the power lead to the power port on the HDCVI camera. For video, use another pair of wires from the Ethernet cable and attach both ends to passive video baluns. Connect one Balun to the HDCVI DVR and the other to the BNC port on the camera.

In conclusion, there are many different options to connect the HDCVI DVR to an HDCVI Camera. We highly recommend the first two options for best picture resolution and clarity. Plug and play cables are easy, but the clarity isn’t as good as standard coax cable. For more information on HDCVI, visit our “What is HD-CVI” page on our website at http://www.securitycameraking.com/what-is-hd-cvi.html.

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