Yes [AFAIK], TVI is hi-def[digital] over analog cables -- one of several 'protocols'.
Not an expert but am learning, those 'in the know' will provide more info.
HikVision seems to be a very solid provider of digital camera systems. I did not even know they did AHD, was only aware of the POE NVRs and cameras. Looks like it only supports three technologies though [TVI, AHD and analog]
Thanks for the links/info.