HD-TVI, HD-CVI, HD-SDI, AHD, Analog & IP Camera
Even we enter into digital era, analog surveillance technology doesn't stop its innovation. Besides the HD-SDI and HD-CVI (in house technology of Dahua), today the Hikvision and other camera manufacturers announce HD-TVI cameras release. HD-TVI means High Definition Transport Video Interface, HD-TVI is based on traditional coaxial cable for video and data transmission, it supports not only 720P/1080P video signal, but also including audio, data signal over long distance up to 500 meters.
At present, there are approximate 100 million coaxial cables are deployed for analog camera connection. In the next 3-5 years, they will be replaced with high definition camera. However, some users start to worry they have to rewire, re-install or add new network devices for upgrading. This group of users prefer the economical and easy solution to upgrade existing system to HD, rather than adopting the IP camera. In this context, the HD-SDI and HD-TVI technologies were born.
HD-TVI advantages
500 meters long range video transmission:-
As we know, HD-SDI and conventional analog solutions only has limited 100 meters video transmission. Additionally, the cost of HD-SDI equipment is more expensive. The HDTVI technology (HikVision) offers long range distance video transmission at 1080P/720P through coaxial cable. The cost of HD-TVI products is very affordable, permit users upgrade the system with minimum investment. This makes HDTVI become a perfect solution to fit all analog surveillance applications. Furthermore, the new HDTVI technology support UTC function which can allow user to remotely control the OSD menu and PTZ control via coaxial cable. This means user can quickly install and adjust the camera without accessing the camera itself.
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| HDTVI Camera with CS 4mm lens |
Analog high definition resolution at 720P/1080P:-
Similar to HD-CVI (in house technology from Dahua) and HD-SDI, the new HDTVI cameras can deliver real time 720P/1080P HD resolution video without video latency. The HDTVI DVRs support full time 720P/180P video recording and playback. Through using HDTVI compatible cameras and DVRs, user can setup a complete new HD analog surveillance system or easily upgrade the existing conventional analog system to HD surveillance system.
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| HDTVI Camera with CS 12mm lens, |
Broad manufacturers to offer great compatibility:-
HDTVI equipment is HDTVI open standard, which guarantees trouble-free connection to other HDTVI-compliant cameras and DVRs. By the way, the new designed HDTVI DVR also can support traditional standard video camera for offering great flexibility. All HDTVI HD cameras can access third party DVRs equipped with HDTVI technology from other manufacturers. The main HDTVI members including TVT, Hikvision, Hisharp, Unifore, LSVT...etc.
HD-TVI vs Analog
In summary, the advantage of HD-TVI compared with Analogue is:
1. HD resolution on 720P/1080P at 25/30fps
2. Long distance transmission for HD video
3. No video quality loss and delay for transmission
HD-TVI vs HD-CVI
Obviously, HD-TVI and HD-CVI have very similar features, both of them can provide analog high definition solutions. HD-TVI derives from American based company that does not supply to only one manufacturer. Therefore we are expecting many analog camera manufacturers will release wide range of HD-TVI based cameras to market. Therefore, HD-TVI is more likely to become an industry standard, not a proprietary technology/solution.
HD-SDI vs HD-CVI
HD-TVI vs HD-SDI
In conclusion, compared with HD-SDI, new HD solution with advantages of:
1. Longer video transmission distance up to 1000ft (300m) over regular coaxial cable
2. 700ft (200m) distance for video transmission over UTP (Cat5, twisted cable)
3. More cheaper price for analog HD system
4. Support twisted cable installation
HD-TVI vs IP Camera
Hence, compared with IPC, the advantages of HD-TVI are
1. No network bandwidth requirement/influence
2. No network configuration, as easy as analog system
3. No video quality loss and compression
4. No video latency issue, real time live-view
5. Long video transmission distance
6. More affordable price for camera and video storage devices
AHD advantages
A new kind of camera: AHD Camera (Analog high definition)/HD-AHD is developing so soon in the market now.
The price is similar as Analog camera and the image effect is similar as digital camera!
The price is similar as Analog camera and the image effect is similar as digital camera!
The Advantages of AHD Camera:
1) AHD Camera can link with general DVR and the resolution is looks like 1000tvl analog cameras.
2) AHD Camera can link with AHD DVR, and the resolution is Megapixel High Definition ( Now have 1MP, 1.3MP already).
3) Transmit by Coaxial cable-500m!!
4) The price is similar as Analog system no matter considering DVR or camera.
1) AHD Camera can link with general DVR and the resolution is looks like 1000tvl analog cameras.
2) AHD Camera can link with AHD DVR, and the resolution is Megapixel High Definition ( Now have 1MP, 1.3MP already).
3) Transmit by Coaxial cable-500m!!
4) The price is similar as Analog system no matter considering DVR or camera.
HD-CVI cameras vs HD-AHD cameras
1. 1.0 megapixel AHD camera adopts OV9712 + NVP2431H solution (CMOS Chip: OV9712 & DSP Chips : Nextchip NVP2431H), while HD-CVI camera adopts the PO3100K + DH9801 solution. In addition to the difference of solution, the price vary greatly, OV9712 + NVP2431 of AHD camera module only costs US$7.5, and PO3100K + DH9801 camera module costs approximate US$11.
2. AHD camera can connect to CRT display directly, the image can display properly. HD-CVI camera connects to traditional CRT, it doesn't show images. For video live view/recording/playback, HD-CVI cameras need to work with HD-CVI DVR. It seems, the HD-AHD cameras support 960H output mode, which is very convenient for test and installation. Since the AHD cameras can be backward compatible with all traditional analog equipment. Compared with HD-CVI, it has advantages of great compatibility.
3. Competiable with normal D1 / 960H, and analog peripherals (including distributors, matrix, etc.). Switch AHD, IP and Anolog video signal from AHD DVR in no time.
4. Strong anti-interference capability & solid interface protection that can avoid space high frequency electromagnetic radiation to ensure a constant signal transmission of high definition video display without problems as frame drop and lock loss occurred.
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