Martin McCormick wrote: > Thank you very much. I started using unix-like OS's 30 > years ago in June but the digital video field is new to me so I > still have a lot of learning to do. > > As an electronics and amateur radio enthusiast, I am > astounded at how fast that A/D converter has to work along with > the Nyquist filtering to properly digitize the video. > > With North American NTSC color video, the dot clock rate > is 3.7945 million plus a few more decimal places per second and > PAL along with SECAM are just above 4 MHZ. The A/D converter has > to sample at twice that rate to keep Mr. Nyquist from haunting > anybody from his grave.
I still don't get it how you want to capture and process video to text to audio - perhaps deduplicate frame content etc. - how many frames per second do you want to process, cause I did not get this with the 4Mhz and how it is relevant. I was thinking your display is running at 60Hz, which is most common nowdays. This means you have 60 images/sec .... hmmm how do you process 60/sec? I am really wondering.
