Interlacing and channel bandwidth

[old_tv_nut]

Originally Posted by ppppenguin

...In any case all HD systems we use square pixels so if there is still a Kell effect there is a shortfall of vertical resolution.

Not sure what you mean here. "Square pixels" is a lousy term, as it does not refer to the display elements having a certain shape. This phrase is used to mean that the centers of the pixels have the same spacing vertically and horizontally. Pixels are point values of color and do not have shape or dimensions.

If you mean the display elements have square shapes, then, yes, this implies a certain vertical and horizontal spatial frequency response, different from that with a Gaussian CRT spot.