Today we’re going to be answering the question what are the four different analog video signal types. This particular question pertains to information that’s relative to analog CCTV cameras and DVR. It does not pertain to IP cameras and NVR. The four video signal types are incredibly important information to have an understanding.
Why the four signal types matter for analog CCTV cameras? first know that analog cctv cameras have been around longer than IP cameras they use a BNC cable to transmit their audio video and metadata rather than an Ethernet cable and they do this to a DVR rather than an NVR though most of the signals used to be only analog. Nowadays there are actually a lot of digital signals designed to transmit higher resolutions and that’s why these video signal types are so important. Different DVR from different manufacturers might be capable of accepting different video signal types or even all of them most of our DVR can do all of the video signal types and are called Penta prints because they can actually take IP cameras as well as analog camera. Some cameras can also do all four signal types and simply need to be adjusted while others can only do one or two make sure to always talk to a sales pro to ensure compatibility before you make a purchase.
Let’s get into the four signal types and what they mean one of the oldest available technologies around cvbs stands for composite video baseband signal. cvbs is a completely analog signal and although it’s still available on most cameras as a low end option it is essentially obsolete compared to the other video signal types cameras. Today are rated in pixels but for time they were rated in tvl lines when almost all video signals were considered analog cvbs was commonly used with 480 tvl or 520 tvl line image quality which is comparable to 480p standard definition. Today as the CCTV industry began to grow analog systems needed counterparts to compete with the newer hd resolutions that were making IP cameras a better choice and they wanted to do this without having to have their consumers spend their entire existing cabling or systems thus analog high definition or AHD was created. AHD supports analog signals but for high definition resolution limited to 1 and 2 megapixels. AHD also supports digital transmissions over analog for resolutions above 1080p such as 3MP, 4MP and even 8MP.
There are currently two major competing video signal types for truly digital video over analog CCTV cable. The first is transport video interface also known as TVI the second is CVI or composite video interface both transmitted digital signal over an analog BNC cable. TVI was until recently limited to 1080p but is now capable of resolutions up to 4k alongside its CVI counterpart. However CVI is proprietary to our elite camera systems and therefore works best with those systems. Both of these technologies are available on the vast majority of our elite series cameras. So it’s important that before you buy you always check with one of our sale to ensure compatibility between your DVR and any prospective CCTV Camera purchases. We broke down the four available video signal types for analog CCTV cameras. For any more questions about how these video signal types work or pertain to your system or about compatibility or availability contact Soni Telecom.