HD-TVI, also referred to as TurboHD was introduced by Hikvision.
HD-CVI is a proprietary standard developed by Dahua Technology. It offers two resolutions: HD (1280 x 720) and Full HD (1920 x 1080).
HD – 1280 x 720 px
Full HD – 1920 x 1080 px
3 Mpx – 2048 x 1536 px
4 Mpx – 2688 x 1520 px
5 Mpx – 2560 x 1944 px
8 Mpx 4K UHD – 3840 x 2160 px
The technology supports two resolutions: 1280x720 px and 1920x1080 px. The video is transmitted in real-time.
Video, audio and control signals can be sent via a single coaxial cable - Fig. 1.
1 - HD video signal
2 - Control
3 - Audio signal
Full compatibility of HD-TVI recorders with analogue cameras allows to gradually replace PAL cameras with HD cameras. The recorders offered by the manufacturer, apart from HD-TVI and PAL cameras, also support IP cameras (depending on the model, connected via a proprietary or Onvif protocol).
The system can be connected using coaxial cables or twisted pair cables. Maximum distance, as specified by the manufacturer is up to 500 m – for RG-59 cable. However, the tests show that the maximum distance without any deterioration of the image quality is 400 m - both at 1080p and 720p.
Fig. 2. Screenshot from HD-TVI camera at 720p (RG-59 400 m)
Fig. 3. Screenshot from HD-TVI camera at 1080p (RG-59 400 m)
For UTP-based systems, the maximum distance is approx. 150 m. The maximum distance may differ depending on the video balun used.
Detailed parameters of the standard can be found in the article: