**What is HDCVI?**
In November 2012, Dahua Technology Co., Ltd. introduced HDCVI, a high-definition coaxial video interface technology with independent intellectual property. This innovative solution allows for the reliable transmission of ultra-high-definition video signals over long distances using existing SYV75-3 or SYV75-5 coaxial cables. Unlike HD-SDI, which demands high-quality cabling and precise installation, HDCVI adapts well to low-cost, long-distance media and complex deployment scenarios.
HDCVI uses baseband modulation and quadrature amplitude modulation (QAM) to convert video signals into high-definition electrical signals that travel through coaxial cables. It avoids the chroma crosstalk common in CVBS by separating luminance and chrominance signals, resulting in improved image quality. The technology supports both 1920H and 1280H resolutions, as well as standard 1080P and 720P formats, ensuring compatibility with existing systems.
The system uses a star topology where cameras connect directly to a DVR via coaxial cables. Within 500 meters, SYV75-3 or SYV75-5 cables can be used, while longer distances require higher-grade cables. Installation is straightforward, similar to traditional analog systems, making it easy for technicians to implement without special training.
HDCVI also supports multi-signal transmission, embedding audio and bidirectional data within the blanking intervals of the video signal. Audio is synchronized with video, supporting up to 44.1 kHz sampling rates, while control signals like PTZ and alarms are transmitted back and forth. Although the reverse channel has lower baud rates due to impedance and interference, automatic compensation ensures reliable long-distance communication.
Overall, HDCVI is a cost-effective, low-latency, high-efficiency, and interference-resistant solution for megapixel HD video transmission.
**HDCVI Implementation Carrier – HDCVI Chip**
In August 2013, Dahua launched a chip solution for HDCVI, consisting of transmit (TX) and receive (RX) chips. These chips are used in HDCVI cameras and DVRs and can also support optical transmitters, distributors, and matrices.
The TX chip features BT1120/BT656 digital video interfaces, I2S audio interfaces, and I2C configuration ports, making it compatible with various ISP and audio chips. It supports all HDCVI resolutions and frame rates, including 1280H@25/30/50/60fps and 1920H@25/30fps. It also supports traditional CVBS format, making integration easier.
The RX chip handles four channels of HDCVI input and four channels of digital output, with flexible mapping of video parameters and built-in equalizers for long-distance signal restoration. Its design allows seamless integration with existing analog DVRs, enabling smooth upgrades from SD to HD.
These chips enable manufacturers to make minimal changes to existing camera and DVR systems, accelerating the adoption of HD surveillance.
**Advantages of HDCVI**
Compared to HD-SDI, HDCVI offers superior transmission distance, with 500 meters on 75-3 cable and even more with 75-5. It is less susceptible to electromagnetic interference, making it ideal for environments with wireless devices. Installation is simpler, following analog standards, reducing labor costs and complexity.
When compared to IP-based systems, HDCVI provides no latency and direct point-to-point transmission, avoiding network jitter and packet loss. It also simplifies setup, as users don’t need to configure IP addresses or deal with protocol issues. HDCVI’s use of a single coaxial cable for video, audio, and control signals further reduces installation complexity.
Additionally, HDCVI maintains the same cost structure as analog systems, offering HD benefits without a significant price increase. It is an excellent choice for upgrading legacy systems.
**System Solution**
HDCVI systems use HDCVI cameras and DVRs in a star topology, similar to analog setups. They are easy to install and maintain, with no special requirements for cabling or connections. Users can choose cameras, DVRs, and storage based on their needs, just like in the SD era, but with higher resolution.
For longer distances, multiple DVRs can be connected in a network, each covering a limited range. HDCVI also supports auxiliary devices like microphones and alarm sensors, which can be integrated via the same coaxial cable.
**Technology Development Trend**
As HDCVI matures, its adoption is growing across the security industry. With diverse product offerings and strong system support, it is becoming a key player in the HD surveillance market. More manufacturers are investing in this technology, driving innovation and expanding its application scope.
**Conclusion**
HDCVI represents a smart upgrade path for analog systems, offering HD performance at a competitive cost. As the security industry moves toward higher resolution, HDCVI will play a crucial role in shaping the future of video surveillance. With continued development and industry support, it is expected to become a standard in high-definition monitoring.
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