Create my own TV test pattern generator

[Sainti]

Hello,

I would like to ask again about building my TV pattern generator because I still don't have any knowledge about how to build it and what components are required for which I want to create replicas such as PM5544, PM5534, PM5644 or others. Is there anyone who can offer me a way to get there?

Kind regards

[mianos]

Biluni has done it a few times:
https://github.com/bitluni/ESP32CompositeVideo
That could be used to make the most basic non precision test patterns.
For a proper precision signal I'd guess you would need an FPGA and a DAC. Not too hard if you know that stuff. Probably impossible if you don't or don't want to spend the time and effort to learn the structure of the signals and how to make some VHDL, Verilog or similar to make them.
Some people just use an MCU but I think you would want to bit more in hardware to deal with the total clock rates needed.

[PCB.Wiz]

Is there anyone who can offer me a way to get there?

I think you can still buy RGB (analog) to Composite Video encoder chips.
That manages all the Analog/phase stuff and you just need to feed it information.
There are still available parallel DAC, like ADV7123, that are an overkill, but simple to apply. 

In 2024 a simple way to manage that would be a sprinkle of fast SPI Serial SRAM, Microchip now make 4MBit SRAM, so you might allocate one for each of R,G,B,Sync.
- you then fill the RAM from FLASH with any pattern you like, and play back.

With a bit more SW effort, you could look at a part like Parallax P2.
That has Video DACs and high speed IO, that could probably swallow everything into a single part.

eg   https://forums.parallax.com/discussion/173102/ntsc-pal-driver-without-dot-crawl-new-version/p1

[NiHaoMike]

Just get a Raspberry Pi of some sort and use the composite out on it.

[Sainti]

I recommend using two sources of Philips pattern generator to replicate them too.
https://github.com/inaxeon/PhilipsPatternRom
https://github.com/inaxeon/PTV_Preservation