HD surveillance Trend and explicit Dahua HDCVI Technology.
HD surveillance Trend and explicit Dahua HDCVI Technology.
The video surveillance segment has enjoyed a great progress over past few years and there is no denying that we are now in the middle of “HD THE KING” era, the industry’s getting more active than never ever, trying hard to catch and even have a lead in this trend. The three main HD solutions, namely, IP HD, HD-SDI HD and analog HD have been intensively discussed on their edges and restrictions, people are trying to figure out which one will be the optimal solution in the long run. When my opinion’s brought up, I’d say, I still uphold the idea that the IP solution is just only an important and indispensible direction in the surveillance development path, but definitely not the sole or even the ultimate terminator.
Let’s face the fact that although the whole surveillance technology and it’s market are undergoing a profound change, and the IP solution is very popular due to its very own natures, such as high image quality, easy cabling, long-distance and non-compression transmission, but somehow we are ignoring an important and also practical factor — the infrastructure. After all, the analog solution has its vast base and what’s more, the unlikely precedable advantages, such as the vast existing market, customers’ using habit, stability and reliability. However, despite its advantages, its “just-fine” image quality can’t meet today’s HD demand anymore. But now, Dahua Technology is about to introduce a “sacred liquid” to heal the Achilles' heel — Dahua in-house transmission technology HDCVI (High Definition Composite Video Interface). As the naming tells, it is for HD data transmission, which is an over-coaxial-cable analog HD video transmission standard which developed in-house. The technology renders two HD video formats—1920H (1920×1080) & 1280H (1280×720) by progressive scanning.
What’s NEW?First, as is mentioned, the HDCVI was specially designed for authentic analog HD transmission with max. definition of 1280H (1280×720) and 1920H (1920×1080), which is way better than the current 960H (960x576) generation products. And due to the fact that the chroma signal of CVBS is on the carrier wave of 4.43MHz, which is within the brightness range, thus the signal crosstalk problem has yet to be solved despite the separation processing on the back-end. However, the HDCVI can successfully remove this obstacle with the new modulation tech adopted, and ensure a high separation ratio in modulating the brightness and chroma and maximizing the resolution and visual effect.
Second, the current “CVBS products” need extra cabling, components and installation, such as audio cable and built-in modules or external devices to realize audio and reverse control. But HDCVI again solves the problem by compounding the video/audio/PTZ signals together while standardizing the two-way transmission format, ensuring the compatibility of the products while simplifying the installation and maintenance.
Third comes to the cost. HDCVI has a born natural advantage in installation and costs concerning accessories and maintenance as it reserves the conventional analog system structure.
HDCVI VS. HD-SDISpeaking of the high analog image resolution, HD-SDI does have a saying, but when it comes to the transmission restriction or distance, it may better keep the voice down a little. As far as my knowledge reaches, even with the cableΦ75-5 and the latest compression technology under HDCCTV alliance, it’s max transmission distance is about 300 meters, theoretically. But for the HDCVI, its minimum transmission distance is 500 meters with cableΦ75-3. In addition, while in transmitting, HD-SDI signal is easily to be interfered, especially in high-frequency environment, such as mobile and router stuffed environment, which can easily exert a bad effect on image, such as screen mess or image instability; on the contrary, it has a strong anti-interference capability & solid interface protection: free of high-frequent electromagnetic radiation; constant signal transmission and display without problems as frame drop and lock loss occurred.
In addition to the weak on cabling, HD-SDI sets the bar high for installation, like the connectors have to be perfectly welded and etc., all that requires a cautious well-planed construction design and highly-qualified construction team.
HDCVI VS. IPAs HDCVI can be regarded as the upgrade version of the previous analog system, so it naturally evades the disadvantages of IP solution, here is no longer discussed.
The HDCVI product package has been released in Security China 2012 and received a lot of attention and interest. About a decade ago, Dahua has already successfully opened the real-time standalone DVR, and this time, we do have faith in it as well — the HDCVI will be our another big and promising innovative move. At the crossroad of the HD highway, are you ready to be with us?
The video surveillance segment has enjoyed a great progress over past few years and there is no denying that we are now in the middle of “HD THE KING” era, the industry’s getting more active than never ever, trying hard to catch and even have a lead in this trend. The three main HD solutions, namely, IP HD, HD-SDI HD and analog HD have been intensively discussed on their edges and restrictions, people are trying to figure out which one will be the optimal solution in the long run. When my opinion’s brought up, I’d say, I still uphold the idea that the IP solution is just only an important and indispensible direction in the surveillance development path, but definitely not the sole or even the ultimate terminator.
Let’s face the fact that although the whole surveillance technology and it’s market are undergoing a profound change, and the IP solution is very popular due to its very own natures, such as high image quality, easy cabling, long-distance and non-compression transmission, but somehow we are ignoring an important and also practical factor — the infrastructure. After all, the analog solution has its vast base and what’s more, the unlikely precedable advantages, such as the vast existing market, customers’ using habit, stability and reliability. However, despite its advantages, its “just-fine” image quality can’t meet today’s HD demand anymore. But now, Dahua Technology is about to introduce a “sacred liquid” to heal the Achilles' heel — Dahua in-house transmission technology HDCVI (High Definition Composite Video Interface). As the naming tells, it is for HD data transmission, which is an over-coaxial-cable analog HD video transmission standard which developed in-house. The technology renders two HD video formats—1920H (1920×1080) & 1280H (1280×720) by progressive scanning.
What’s NEW?First, as is mentioned, the HDCVI was specially designed for authentic analog HD transmission with max. definition of 1280H (1280×720) and 1920H (1920×1080), which is way better than the current 960H (960x576) generation products. And due to the fact that the chroma signal of CVBS is on the carrier wave of 4.43MHz, which is within the brightness range, thus the signal crosstalk problem has yet to be solved despite the separation processing on the back-end. However, the HDCVI can successfully remove this obstacle with the new modulation tech adopted, and ensure a high separation ratio in modulating the brightness and chroma and maximizing the resolution and visual effect.
Second, the current “CVBS products” need extra cabling, components and installation, such as audio cable and built-in modules or external devices to realize audio and reverse control. But HDCVI again solves the problem by compounding the video/audio/PTZ signals together while standardizing the two-way transmission format, ensuring the compatibility of the products while simplifying the installation and maintenance.
Third comes to the cost. HDCVI has a born natural advantage in installation and costs concerning accessories and maintenance as it reserves the conventional analog system structure.
HDCVI VS. HD-SDISpeaking of the high analog image resolution, HD-SDI does have a saying, but when it comes to the transmission restriction or distance, it may better keep the voice down a little. As far as my knowledge reaches, even with the cableΦ75-5 and the latest compression technology under HDCCTV alliance, it’s max transmission distance is about 300 meters, theoretically. But for the HDCVI, its minimum transmission distance is 500 meters with cableΦ75-3. In addition, while in transmitting, HD-SDI signal is easily to be interfered, especially in high-frequency environment, such as mobile and router stuffed environment, which can easily exert a bad effect on image, such as screen mess or image instability; on the contrary, it has a strong anti-interference capability & solid interface protection: free of high-frequent electromagnetic radiation; constant signal transmission and display without problems as frame drop and lock loss occurred.
In addition to the weak on cabling, HD-SDI sets the bar high for installation, like the connectors have to be perfectly welded and etc., all that requires a cautious well-planed construction design and highly-qualified construction team.
HDCVI VS. IPAs HDCVI can be regarded as the upgrade version of the previous analog system, so it naturally evades the disadvantages of IP solution, here is no longer discussed.
Dahua, as an innovative corporate, is always seeking a way for improvement, and the HDCVI standard, which is not only a technological breakthrough, but also of great commercial value.
The HDCVI product package has been released in Security China 2012 and received a lot of attention and interest. About a decade ago, Dahua has already successfully opened the real-time standalone DVR, and this time, we do have faith in it as well — the HDCVI will be our another big and promising innovative move. At the crossroad of the HD highway, are you ready to be with us?
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