Anyone know where I can get the specs for the 3 HD analog formats?

[Videogamer555]

I know there's AHD (Analog HD), HD-TVI (HD Transport Video Interface), and HD-CVI (HT Coaxial Video Interface), used as high definition analog video formats (supporting video as high in vertical resolution as 1080 scanlines) on security cameras (mostly ones from China that have an external switch to manually select between these 3 high definition formats and also standard 480i video). These 3 HD analog standards all use composite video (everything sent on a single coaxial cable). But where can I find the official specs? It's pretty easy to find the NTSC specification https://antiqueradio.org/art/NTSC%20Signal%20Specifications.pdf but not for the HD analog signal types. And trust me, I've tried looking. Even HD-TVI which I've read somewhere explicitly stated that it was released as a public domain standard, I can't find anywhere. So are these Chinese invented standards, that aren't distributed on English language websites (which is why Google doesn't show them to me)? I know most (if not all) of the cameras that support these standards seem to be from no-name Chinese companies selling through either eBay or Amazon as a 3rd party seller.

[october262]

I know there's AHD (Analog HD), HD-TVI (HD Transport Video Interface), and HD-CVI (HT Coaxial Video Interface), used as high definition analog video formats (supporting video as high in vertical resolution as 1080 scanlines) on security cameras (mostly ones from China that have an external switch to manually select between these 3 high definition formats and also standard 480i video). These 3 HD analog standards all use composite video (everything sent on a single coaxial cable). But where can I find the official specs? It's pretty easy to find the NTSC specification https://antiqueradio.org/art/NTSC%20Signal%20Specifications.pdf but not for the HD analog signal types. And trust me, I've tried looking. Even HD-TVI which I've read somewhere explicitly stated that it was released as a public domain standard, I can't find anywhere. So are these Chinese invented standards, that aren't distributed on English language websites (which is why Google doesn't show them to me)? I know most (if not all) of the cameras that support these standards seem to be from no-name Chinese companies selling through either eBay or Amazon as a 3rd party seller.

would this help ?? - https://www.pcmag.com/encyclopedia/term/hd-analog

[Videogamer555]

I know there's AHD (Analog HD), HD-TVI (HD Transport Video Interface), and HD-CVI (HT Coaxial Video Interface), used as high definition analog video formats (supporting video as high in vertical resolution as 1080 scanlines) on security cameras (mostly ones from China that have an external switch to manually select between these 3 high definition formats and also standard 480i video). These 3 HD analog standards all use composite video (everything sent on a single coaxial cable). But where can I find the official specs? It's pretty easy to find the NTSC specification https://antiqueradio.org/art/NTSC%20Signal%20Specifications.pdf but not for the HD analog signal types. And trust me, I've tried looking. Even HD-TVI which I've read somewhere explicitly stated that it was released as a public domain standard, I can't find anywhere. So are these Chinese invented standards, that aren't distributed on English language websites (which is why Google doesn't show them to me)? I know most (if not all) of the cameras that support these standards seem to be from no-name Chinese companies selling through either eBay or Amazon as a 3rd party seller.

would this help ?? - https://www.pcmag.com/encyclopedia/term/hd-analog

Unfortunately no. All it is is generic specifications regarding the modes, not detailed techinical descriptions that would be provided in the official documents that define the modes. This document is the official NTSC specification https://antiqueradio.org/art/NTSC%20Signal%20Specifications.pdf and it has all the timing and signal level information you'd need to make an encoder or decoder for NTSC video. I'm looking for something similar for the 3 HD analog video standards called AHD, HD-CVI, and HD-TVI. I think they may have been invented in China or something, as only Chinese security cameras on Amazon and eBay seem to support these standards. So the spec documents may not be available on any English language website (which might be why I haven't ever found them using Google). I'm hoping here to find on this forum an expert in more exotic analog video standards, who may be able to point me to PDF files that are the documents that define these 3 standards. Some of them may be proprietary, but at least one of them (HD-TVI) I know is supposedly public domain.