- Technical Highlights:
- HD Video format: 1920H(1920×1080) & 1280H(1280×720)
- Analog Modulation Uncompressed and crosstalk-free
- Transmission over coaxial cable Reliable and non-latency point-to-point transmission
- Auto Compensation & Long range transmission: 1280H(1280×720): 500m via Φ75-3, 650m via Φ75-5 / 1920H(1920×1080): 300m via Φ75-3, 400m via Φ75-5
- Composite video/audio/PTZ signals HDCVI composites video, audio and PTZ signals together and have them transmitted over coaxial cable.
- Two-way data transmission
- Upgraded to analog HD seamlessly with Low-cost and simple installation value-added solution. Go after the conventional analog system topology and give a full consideration to users’ operation habit.
- Megapixel & uncompressed image quality —1920H (1920×1080) & 1280H (1280×720)
- Long range & non-latency reliable video transmission without additions of relay devices.
- 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.
- An open analog HD transmission system established and evolved industry chain developed to sustainably improve the technical standard.
As the industry moves from standard definition to high definition, how can we ensure the whole surveillance system not only satisfies the resolution requirement, but also the total cost? DNS KOREA presents High Definition Composite Video Interface (HDCVI) technology to the market. HDCVI, DNS KOREA ‘s in-house technology, is an over-coaxial-cable analog HD video transmission standard, allowing long-distance HD transmission at a lower cost to meet the requirements for a complex and large installation.
Submitted by DNS KOREA Technology
Analog systems, based on coaxial cabling, still dominate today’s video surveillance market — there are approximately 400 million analog cameras in use throughout the world. The demand for high definition from end-users is undoubtedly increasing; however, the need to change the cabling for a HD system can result in higher operational costs. With no new cabling or IP hassle required, HDCVI is one option for upgrading existing systems from standard definition to high definition, offering longer transmission via coaxial cable and lower total cost.
What is HDCVI?
HDCVI is a solution for megapixel high definition applications, featuring non-latent long-distance transmission at a lower cost. The name has to do with its baseband and quadrature amplitude modulation technology, which is able to avoid CVBS cross talk, completely separate brightness and hue signal, and further enhances video quality.
The HDCVI solution incorporates both cameras and DVRs. The system is star topology structured — the DVR serves as a node for an over coax P2P (Point-to-Point) transmission to the camera. The technology offers two specifications: 1080p (1920×1080) and 720p (1280×720). In addition, the technology features the Auto Signal Compensation (ASC) patent, which only allows an extremely low signal distortion along long-distance transmissions.
Transmitting data over 500m over a coaxial cable can be realized, depending on the cable selected. Cable 75-3 and 75-5 are recommended for transmissions within 500m, cable 75-5 and above for over 500m. Connectors and welding process also affect the transmission distance.
3 Signals in 1 Coaxial Cable
HDCVI composites video, audio, and control signals together and then transmits them over one coaxial cable, simplifying installation.
To further realize multiple-signal transmission over one cable, both audio and dual-way data communication signals are embedded in a blanking zone. This enhances synchronization with the video signal and supports a max sampling rate of 44.1kHz thanks to ASC.
The forward and reverse data channels are composited in the frame blanking zone, realizing a two-way end-to-end transmission to support control commands such as camera focus, PTZ control, real-time alarm, etc. The forward outputting data supports a high transmission baud rate, as the sending time and electric signal baud rate are predictable, and the receiving end is of high ASC performance.
On the contrary, the reverse outputting data supports a lower baud rate due to its low signal frequency and limited data, which are affected by impedance matching and channel transmission uncertainty. However, by adopting ASC, the reverse channel can restore some degree of electrical signal during long-distance transmission.
The DNS KOREA HDCVI chipset is comprised of a transmitting chip (TX) and receiving chip (RX), which are designed for front-end HDCVI cameras and DVRs, respectively. These chips can also be applied to fiber optics transceivers, distributors, and matrices as well.
TX chip interfaces are a BT1120/BT656 digital video interface, I2S audio interface, and I2C configuration interface, which are all of industrial standard design. This allows the TX chip to be used in any standard interface for ISPs and audio chips on the market.
As for analog output, in addition to the HDCVI format, the TX chip is also compatible with CVBS. The TX chip supports 720p@25fps/30fps/50fps/60fps and 1080p@25fps/30fps.