The digitally transmitted horizontal resolution is usually 720 samples ( which includes 16 samples for the horizontal sync and horizontal blanking ) or 704 visible pixels with an aspect ratio of 4:3 ( with vertically rectangular pixels ) and therefore a display resolution of 640 × 480 ( VGA ) ; that is standard-definition television ( SDTV ) with a 4:3 aspect ratio ( with square pixels ) .
The digitally transmitted horizontal resolution is often 720 samples ( including 16 samples for both horizontal sync and horizontal blanking ) or 704 visible pixels that has an aspect ratio of 4:3 ( with vertically rectangular pixels ) which means a display resolution of 640 × 480 ( VGA ) ; that is standard-definition television ( SDTV ) with a 4:3 aspect ratio ( with square pixels ) .