Aspect ratio control for picture overlays

A display system comprising:

• a video memory;
• means for writing and reading video data information from a video signal into and out of said video memory;
• a line memory for supplying said information from said video memory, having a write port operable synchronously with said reading of said video memory and a read port operable synchronously with a display means for another video signal;
• and
• an interpolator for selectively horizontally compressing and expanding said information read from said video memory independently of any other processing which might vertically compress or expand said video data information.

A display system, comprising:

• a video memory;
• means for writing and reading video data information from a first video signal into and out of said video memory;
• means for supplying said information from said video memory synchronously with means for generating a raster for displaying a second video signal;
• and,
• an interpolator for selectively horizontally compressing and expanding said video data information of said first video signal read from said video memory independently of any vertical compression or expansion of said raster which might also vertically compress or expand said video data information of said first video signal.