New Technology made
everything easy.
A Mega Pixal HD Camera
more than equal to an IP camera at an analog camera price D CVI
Technology
New Technology releases High Definition
Composite Video Interface (HDCVI) technology of Independent Intellectual
Property Rights. HDCVI is a video transmission technology in high definition
via coaxial cable, allowing reliable long-distance HD transmission at lower
cost, while complex deployment is applicable. HDCVI modulates video signal to
level and then transmit by adopting base-band and quadrature amplitude
modulation; which is also the reason of its naming. This technology avoids the
cross talk of CVBS and completely separates the brightness signal and hue
signal, hence further enhances video quality. HDCVI offers two specifications —
1920H (1920×1080) and 1280H (1280×720); which are compatible with the
industrial standard 1080p(1920×1080) and 720p(1920×1080).
In addition, the technology features a patent
named auto signal compensation (ASC), which only allows an extremely low signal
distortion along long-distance transmission. HDCVI solution incorporates both
cameras and DVRs, and the system is star topology structured; DVR is served as
a node to have an over coax P2P (Point-to-Point) transmission to camera. Cable
selection is based on transmission distance: cable 75-3 and 75-5 are
recommended for transmission within 500 meters, cable 75-5 and above for over
500 meters. Connector or jointing technology could be applied for connecting
and the installation is exactly the same as that of conventional analog
devices, which posts no special requirements either for indoor or outdoor
scenarios with better anti-interference capability offered.
To further realize multiple-signal
transmission over one cable, both audio signal and dual-way data communication
signal are embedded in a blanking zone; which enhances the synchronization with
video signal; and max supports 44.1kHz sampling rate thanks to ASC. The forward
and reverse data channels composite 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 and etc. The forward outputting data
supports high transmission baud rate as the sending time and electric signal
baud rate are predictable, meanwhile, the receiving end is of high ASC
performance;
On the other hand, the reverse outputting
data supports lower baud rate due to its low signal frequency and limited data,
which is elected by the impedance matching. However, with ASC adopted, the
reverse channel could restore electric signal during long-distance transmission
at some degree. Therefore, HDCVI is an optimal solution for megapixel high
definition application, featuring non-latent long-distance transmission at
lower cost.
