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I noted the posts on the captioning project and ordered a board. What I need to do is to read a 24bit data word on line 16 (NTSC). Unlike a caption signal there is no run up sync burst, just 24, 2us bit cells with the logic value measured by changing edge directions.
Any idea with using the Video Experimenter libraries here?
Note: I am an EE with 40 years of designing broadcast TV equipment. I was going to build my project all in hardware using the old LM1881 sync separator and an FPGA which I know how to do. But since it will talk to an Arduino anyway I thought for $25, I should try the software approach first?
Hi Andy,
With all your experience in this area, I’m sure you know much more than me. Using the closed captioning project as a guide, you might be able to pluck out the bits from line 16. It will take trial and error. Hopefully, an Arduino microcontroller is fast enough for the 2us wide bits. If not, it’s possible to wire the Video Experimenter to other microcontrollers like in this project: https://nootropicdesign.com/projectlab/2011/07/13/ve-on-the-seeeduino-mega/
Have fun!
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