What is HD-SDI Technology

High definition CCTV just became more affordable.

DigitalSi have released our new HD-SDI Hybrid 1080p 960H high definition digital video recorders. If you have an existing analogue CCTV system, this technology is a low cost upgrade in to high definition CCTV technology.


What is HD-SDI?

High Definition Serial Digital Interface (HD-SDI) is a technology widely used in the TV production industry and is now being introduced to the CCTV industry. This is the competition product to IP or network cameras and they are a good choice when upgrading from an existing analogue system to HD-SDI as it uses the same traditional cabling method of coaxial cable and therefore reduces the installation cost by 50% or more. Much the same as IP cameras, they employ progressive scan technology which eliminates image blur with fast moving objects.


What is an existing analogue system?

If you have an existing CCTV system that has been installed sometime between the year 2000 and 2012 the chances are you have analogue surveillance cameras even though the cameras are recorded on a digital video recorder. Here are a couple of clues you may have analogue:

  1. If they are connected by coaxial cables similar to a TV antenna cable.
  2. If you can't find the words HD-SDI on the digital video recorder
  3. If you see the words like CIF, HALF, D1, FULL or numbers like 360x288, 720x288 or 720x576 in the on-screen set up menu.
  4. If you are unhappy with the quality of the video images during playback.

What does 1080p or Full HD mean?

1080p or Full HD refers to the image size, you may have heard these terms being used before with regard to Full HD TV’s and BluRay disc players. 1080p means that the camera image is 1920 pixels wide x 1080 pixels high. This comparison image shows the size difference between 1080p Full HD, 720p HD and analogue camera image sizes 720x576 and 360x288.