Abstract: A system for storing video information at both a slow scan rate and a fast scan rate, and for retrieving video information signals from the stored information at both the slow scan rate and the fast scan rate. A random access memory stores information provided by digital video information signals. An address selector addresses a selected location in the memory. A slow scan counter provides a count at the slow scan rate. The slow scan count is provided to the address selector for indicating the selected location to be addressed in the memory when either storing or retrieving information at the slow scan rate. A fast scan counter provides a count at the fast scan rate. The fast scan count is provided to the address selector for indicating the selected location to be addressed in the memory when either storing or retrieving information at the fast scan rate.

Abstract: Apparatus for producing a video signal from digitally stored information representing the video signal intensity in each of a plurality of picture element locations within a plurality of scan lines. An analog video signal produced for display from the stored information is blanked during the first half of each picture element location during alternately displayed lines and blanked during the last half of each picture element location during the remaining alternately display lines. This apparatus is used in slow-scan television.