An Overview Of The NTSC Video With VHDL
NTSC video is a very complex standard even without going into the details of how to do the color burst. The analog signals are picky and noise prone which can be frustrating. However, NTSC video signals are transmitted over 1 signal which is impressive to say the least. Few other video standards would dare doing everything on one wire, there's just too much going on.
What To Do Now
Which the basics of how NTSC works in your knowledge bank, there is plenty of elbow space to expand upon this project. The first thought I have is to get a faster Digital To Analog converter (DAC) and built the analog signal via the FPGA with it. This would allow for a perfect analog signal for the NTSC input, instead of using the voltage divider method with resistors. While the voltage divider works, a high speed DAC would work 1000% better.
Conclusion
I will be out-right and honest, NTSC as a video output signal is a real pain to create with digital signals. It's just not meant to be. While the tutorial was successful in displaying video output via NTSC, it was less reliable than VGA or DVI. Either way, this tutorial presented a working method for creating NTSC video output signals and should give anyone just starting out a good idea of the who, what, when and where's of the video standard.
If you have any further questions, I implore you...don't be shy, take a look at the forums or ask a question there. I check them out regularly and love getting comments & questions.
NTSC video is a very complex standard even without going into the details of how to do the color burst. The analog signals are picky and noise prone which can be frustrating. However, NTSC video signals are transmitted over 1 signal which is impressive to say the least. Few other video standards would dare doing everything on one wire, there's just too much going on.
What To Do Now
Which the basics of how NTSC works in your knowledge bank, there is plenty of elbow space to expand upon this project. The first thought I have is to get a faster Digital To Analog converter (DAC) and built the analog signal via the FPGA with it. This would allow for a perfect analog signal for the NTSC input, instead of using the voltage divider method with resistors. While the voltage divider works, a high speed DAC would work 1000% better.
Conclusion
I will be out-right and honest, NTSC as a video output signal is a real pain to create with digital signals. It's just not meant to be. While the tutorial was successful in displaying video output via NTSC, it was less reliable than VGA or DVI. Either way, this tutorial presented a working method for creating NTSC video output signals and should give anyone just starting out a good idea of the who, what, when and where's of the video standard.
If you have any further questions, I implore you...don't be shy, take a look at the forums or ask a question there. I check them out regularly and love getting comments & questions.