Posts Tagged ‘ HD-CVI’



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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The Differences Between HDCVI and Analog CCTV Security Camera Systems

Written By:
Thursday, March 27th, 2014

When it comes to closed circuit television or CCTV systems, there are lots of different brands and types of systems to choose from. I am going to cover the differences between standard analog systems and HDCVI or High Definition Composite Video Interface (analog’s replacement in the near future). For the price of a high-end analog CCTV system, you can get an HDCVI system that will knock your socks off!

Analog Closed Circuit Television System

Analog System

Analog camera systems are the vast majority of camera systems on the market that are in use by the typical surveillance consumer. The best way that I can describe what the footage from these cameras looks like is the typical 7-11 robbery video that you see on the nightly news. With a standard analog camera system, the highest resolution you will get is 960h or 928×480 and most will only produce a standard D1 resolution of 704×480 or essentially 480i. This is equivalent to what television stations broadcast up until June of 2009. After the transition, all “full-power TV Stations” went into broadcasting HD. One of the best examples of the quality of the new transmission is before the change all the news personalities never had to worry too much about their complexion, after the change you could see the pores on these people and the makeup artists had to start working overtime to deal with the added details in their clients.

With a traditional closed circuit camera system, you will typically have a DVR (Digital Video Recorder) for encoding and storing of the video. A cable from the DVR location to the camera location, typically either a plug-and-play premade cable or a Siamese cable; there also could be an Ethernet cable with baluns used as well. A balun simply converts an Ethernet cable to a standard BNC connection; some can also send power and audio over the same Ethernet cable. A power supply is needed to power the camera from the DVR location. A camera with a BNC connector on it typically is under 700TVL or 700 TV lines.

Some of the higher end analog systems have great picture quality and are suitable for some people on the market, but with the fact that as a society, we have grown to expect better definition on any image or video we see. Over time, we will look back on analog camera systems the way we look back at vintage footage.

HDCVI Closed Circuit Television System

HDCVI System

Now you are probably wondering what the heck, another acronym in the security industry! HDCVI actually stands for High Definition Composite Video Interface, but think of it as high definition over any cable type. With HDCVI you will currently be able to get 720p high definition video, with 1080p resolution video in the very near future. While you can technically run HDCVI over any existing security camera cabling that has copper in it, the better the cable the better the results you will see. Let me explain that a little further. To receive the absolute best picture out your HDCVI system you should use either RG59 or RG6 Siamese cable. With most RG59 and RG6 cables on the market, they have more copper in them than most other cable types, and the shielding that surrounds the core helps to prevent interference from outside sources. The next best cabling method would be Ethernet cable (Cat5e/Cat6), preferably a high quality, with baluns. This is because with all the options of cabling this is the second best cable as far as copper content. You can use standard Plug and Play BNC cables, but keep in mind that the better the cable the better the video.

With HDCVI camera systems, you do get the same truly closed circuit television system that you are used to with an analog system, unlike what you get with an IP megapixel camera system. What that means is that all the cameras come directly back to the DVR (Digital Video Recorder) which is where the video is encoded and stored on the internal hard disk drive. This isolates the cameras from the network unless you have the unit connected to the network. Even when the system is connected to the network, it is protected by a three failed attempt lockout. What that means is that even if someone finds the system, if they fail three times on guessing the password, the system locks the account from access and continues to keep on operating as normal. It just helps to prevent unauthorized access to your surveillance system. With the fact that the DVR is doing all of the encoding, this helps to prevent lag in the video. What that means is that what you are truly looking at is what is going on in real time and not having the second or so delay from the live shot to what you are seeing. This is typically a downfall in an IP megapixel camera system. Another advantage of HDCVI camera systems are that all the OSD (On Screen Display), PTZ (Pan Tilt Zoom) control, and audio can be transmitted over the single coaxial cable that is also sending the video from the camera to the DVR.

In conclusion, if you are looking for a new security system, you can go with different options. You can go the traditional analog camera system route and have it be obsolete in a year or so. You can go with an HD-SDI (High Definition – Serial Digital Interface) camera system, which will give you some temporary benefits over HDCVI right now, but will be obsolete in a few years. You can go with an IP megapixel system that will give you the ability to constantly upgrade over the years. Alternatively, you can go with an HDCVI system which has some minimal limitations on the resolution at the time being, but this is the technology that will wipe analog and HD-SDI camera systems off the market. The cost of these HDCVI systems are only a few dollars more than a high end analog system.

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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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What is the Difference Between Analog, HD-CVI, and IP Security Cameras Systems?

Written By:
Tuesday, March 11th, 2014

What is the difference HDCVI, DVR, and IP NVR
Security camera systems come in many different forms and its best to know the difference between them all to help decide what system works best. Here at Security Camera King we sell three different types of technologies. They all have their advantages and disadvantages and just like everything else the more advantages you get with a system can come at a price. Starting at our lower end models is our Analogue cameras which have been the pioneer of security cameras and have served us well. Going to the top is our IP camera systems which produce high definition quality picture and is becoming a standard in the security camera world. Then right in the middle is our HD-CVI camera system which utilizes Analogs existing cable technology but delivers the same picture quality as our IP systems. Given the different options of security camera systems to choose from can give a little confusion but once broken down and dissected will turn confusion into knowledge and help make the right choice for a security system.

When security cameras became popular the first technology was called Analog. These systems worked by using coaxial cable to transmit signals from the camera to a recording device such as a VCR or more relevant a DVR. This technology has worked well for years and is still around today. The benefits of Analog are that its cheaper than most other systems, it is very reliable, and has many options of cameras and DVR’s. Analog is considerably cheaper then and IP or HD-SDI system and still gets the job done. To put in perspective, the difference in cost, if placed side by side a comparable 8ch Analog system and a 8ch HD-SDI system you will spend over 50% less on a Analog system. You won’t get the same picture quality but if you’re looking for a dependable video security system that will provide you a quality picture then this is the best option. The reliability of Analog systems is considerably higher than other systems because of the technology it uses and how it has been perfected for years. They increase in dependability if they are installed correctly and if quality cable was used during the install. The last benefit of Analog camera systems is that they have a wide verity of cameras and DVR combinations to help fit your budget. Cameras can have different technologies that can help with license plate capture or allow you to see at night with a technology called Infrared light and DVR’s can allow you to record at better resolution and faster frame rates. Analog is not the top choice but can give reliability and more options than most other systems out there.

IP stands for “Internet Protocol” which is the next camera system on the list and for most would be the best system for the money. IP camera systems work by using a standard Ethernet cable to connect several cameras together to your LAN “Local Area Network” in your house. What’s nice about IP cameras is that you don’t have to use a recording device on the other end to operate them, they all consist of their own web based program that can be accessed through your computer or a phone for viewing or local camera recording. IP cameras have the most sophisticated technology that gives them ability to achieve these types of operations. If the need to record your footage we sell NVR’s “Network Video Recorders” that allow you to connect up to 128 cameras to a single recorder. It also make it a central viewing station for all of the cameras you set up instead of logging into each individual camera. The cameras themselves can have different types of lenses which gives it the ability to view far away objects without distortion or view a wide shot for more coverage. The best thing about IP camera system is that you can record at a high resolution. In some cases you can record as high as 10 Megapixels! That’s 5x the size as your standard 1080p HD TV. With that picture you can digitally zoom into a video with little to no distortion. There are also other benefits to IP camera systems like POE “Power Over Ethernet” which allows you to use one cable (Ethernet cable) to send power and data to avoid the use of and additional power cable. Doing so can save you time and money for installations and repairs. IP camera systems are becoming more affordable every day and will eventually become the standard in security cameras.

Getting the best shot is what most people are looking for in a security camera system and this can be achieve using the same technology as out predecessor the Analog camera system. HD-CVI can give you the reliability and price of a Analog system but the picture quality of an IP camera system. There are also a lot more benefits to using a HD-CVI camera system for example you can transfer video, audio, and data all through the same coaxial cable. This is something that is possible through IP but new to Analog. This is a benefit because it will save you on wiring and time with configurations on each unit. It also makes it possible to control the OSD functions of the camera at the DVR source. This makes it easier to manage your fixed cameras as well as PTZ’s (Pan Tilt Zoom) The biggest advantage is you can record at 720p resolution ,normally found on a IP camera system, for over half the cost. It is a growing technology but shows its true potential in the field.

Knowing the products and technologies in the security camera industry can give you the upper hand in selling or for personal use. Analog gives you reliability and options all at a reasonable price. IP producing quality picture and on the move to becoming an industry standard. Last but not least HD-CVI which gives you most of the benefits of IP with a similar cost to Analog. Now that its broken down you can digest the information to make the best choice.

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HD-CVI is the next wave in CCTV

Written By:
Tuesday, February 25th, 2014
HD-CVI high definiteion composite video interface

Have you wanted to upgrade your existing analog camera system, but don’t know which way to go? Well I am going to throw you another curve ball. The introduction of High Definition Composite Video Interface or better known as HDCVI. You probably just heard HD bla bla bla, and I can completely understand that. No this isn’t just a new name for an old technology like High Definition Serial Digital Interface or HD-SDI. Yes the video quality is the or soon will be the same, but HD-SDI has many limitations that HDCVI has conquered and HDCVI has some limitations that HD-SDI still wins in at the moment. I am going to go into some of the disadvantages and advantages of HDCVI and HD-SDI in this article.

HDCVI

High Definition Composite Video Interface

HDCVI is the new wave of HD video transmission. At this point HDCVI does have some limitations, but the fact that HDCVI also conforms to the newer HDcctv Alliance standards. These limitations are just temporary. These standards not only incorporate the SMPTE-292M standard from the Society of Motion Picture and Television Engineers for the broadcast television studios, also known as the HD-SDI standard. It goes much further with addition of compliance certification and the multi-vendor interoperability and reliable electrical performance in mass production. HDcctv XR standard or extended reach standard is so that high definition video can travel upto 3 times further than HD-SDI can travel without any type of repeater. The HDcctv CX standard or CatX cable standard is that the system will work over any type of Cat cable on the market. HDcctv AT standard or Advanced Transmission standard means the system can transmit over all traditional closed circuit television cabling infrastructure. HDcctv 2.0 standard allows for the OSD’s of the cameras to be controlled up the cable.

At this point in time HDCVI is limited to only being able to transmit video in 720p high definition. In the very near future this technology will be able to transmit video in 1080p Bluray quality high definition. All this can be accomplished over existing cable infrastructure. Now you are probably asking can I use my existing plug and play cables? The answer is yes, as long as there is some amount of copper in the cable. A major advantage to HDCVI, High Definition Composite Video Interface, and HD-SDI, High Definition – Serial Digital Interface, is the fact that the video is transmitted with no delay in the video transmission, since the recording device the DVR or Digital Video Recorder, that is doing all the encoding after the video is transmitted. Where as with IP megapixel cameras, the camera does the encoding and then transmits the video causing a delay in the initial images coming from the camera to the recorder, the NVR or Network Video Recorder. HDCVI is bringing the closed circuit back to high definition closed circuit television HDCCTV, surveillance networks. This is because with an IP camera system, the cameras are placed on the network and the NVR is also on the network and all communication occurs over said network. This has a lot of devices on the network all communicating over the network. Granted these devices are secure, but they are not truly closed off back to the recorders like HDCVI, Analog, and HD-SDI camera systems.

A major advantage of HDCVI camera systems over IP Megapixel camera systems is the fact that you do not need the network infrastructure with HDCVI that you need with IP camera systems. With HDCVI all the cameras come back to the recorder directly, whereas in IP cameras the camera connects to the network as well as the NVR (Network Video Recorder) and communication between the devices occur through the router. This can cause network lag because of the amount data that each camera is sending over the network. This is why with an NVR and IP cameras you want to make sure that you either have a dedicated network just for the camera system or that you have upgraded the network to Gigabit speeds, with the proper router and devices to get you speeds of 10/100/1000. Most older networks and their devices only had Megabit speeds which are 10/100 Mbps, these networks work fine with older technology. Technology and data has changed drastically in the past few years, people expect higher and higher definition images which is fine but they also eat up more and more bandwidth. Think about this with a Megabit network you really only feasibly have 50Mbps that is usable, since half of the bandwidth is for transmitting and half is for receiving data. On average a 2mp IP camera will take about 8Mbps per camera, if you have a 8 camera system the cameras alone will eat up a standard networks resources and that is with nothing else on the network.

Currently HDCVI camera systems are lacking a few things that HD-SDI camera systems are not. One big thing is that HD-SDI camera systems can record at 1080p resolution, whereas HDCVI is currently limited to only 720p resolution. Another temporary disadvantage of HDCVI is that the DVRs are limited in the amount of hard drive space they can currently accept, whereas HD-SDI DVRs come in larger cases that can accept more hard drives. Another temporary advantage to HD-SDI is that every channel has the ability to record audio, where currently on HDCVI you can only record audio on channel 1.

differences in resolutions

Now look at the images above. Would you rather have the image on the left the D1 resolution or the 1.3mp resolution? Me personally when I can spend a few dollars more and get the 1.3mp resolution and not have to be a network engineer to get this, I would go with that. This is the resolution that HDCVI gives you standard, soon the image on the left will also be available and this will then kill analog and HD-SDI camera systems. To recap, with HDCVI you can use virtually any cable that is existing or even on a new install. You get High Definition imaging with virtually no delay in video. The cost is almost the same as high end analog camera systems. The video transmission is not limited like it is in both HD-SDI and IP camera systems. With both of those you need repeaters to go over 300 feet. Blow your friends and customers away without blowing your bank account.

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