[DVtyro]

Originally Posted by Electronic M

You're asking way too many questions at once. It's sensory overload reading it all.

Then read slower and make pauses

Originally Posted by Electronic M

There are some major fundamental things you're missing if you are describing analog TV and video information interms of pixels. There are no pixels in analog TV and they aren't a great way to quantify analog video system performance.
Television is a raster, which is a stack of scan lines (525 of them). A scan line is a continuous horizontal stripe of phosphor and analog information there are no defined pixel like boxes.

Of course, there are. Here, two pixels are defined by one period.



How TV bandwidth is calculated? Suppose the frame is square, H high and L wide with number of lines N. Each line has LN/H elements a.k.a. pixels. Because there are N lines, total number of elements is LN^2/H. One period is good for two elements ("pixels"), so we need LN^2/(2H) periods per one frame. The frequency should be LN^2*n/(2H), where n is frame rate. Correcting for 4/3 display aspect ratio we get 4*N^2*n/(3*2) Hz. Say, for NTSC we get 4*525^2*30/6 = 5.5 MHz.

Originally Posted by Electronic M

The grid is NOT pixels, but merely a necessary side effect of needing 3 different color phosphors.

I am not interested in phosphors and CRT tubes.

Originally Posted by Electronic M

Because a video dark to bright transition can be anywhere on the line digitizing that video can actually reduce resolution as the pixels in the digitizer may not line up with the transitions in a way that is can capture them or there may not be as many pixels as transitions thus there isn't a box to put some of the transitions into.

Not interested in digitizing either.

Originally Posted by Electronic M

The horizontal line frequency is 15,750Hz so a horizontal line takes (time in seconds)= 1/(frequency in Hz)....Minus the duration of a complete horizontal sync pulse. If you convert the non-sync portion of the horizontal line time back to a frequency F=1/T vou can divide the video frequency by the visible line frequency and get the number of black/white transitions (number of vertical lines that can be displayed) at that video frequency. (I think I have that math right correct me if I'm wrong)

Right, elements. Or element pairs on EACH LINE, so they are effectively pixels (from "PIcture ELement").