Schaltung zur Verarbeitung eines Videosignals

摘要

Interpolated scan lines are produced in response to received video signals which are comprised of conventional interlaced scan lines constituting successive fields. A delay circuit 501y,502y,503y; 501C,502C,503C, preferably formed of field memory devices, such as three cascaded field memories, functions to delay the received video signals to provide a first scanned line signal b in a given field, the next succeeding scan line signal c in that field, an interlaced scan line signal a in the next succeeding field and an interlaced scan line signal d in the next preceding field. A first combining circuit 504y,504C combines the signal values of the next succeeding field interlaced scan line signal a and the next preceding field interlaced scan line signal d to form a first combined scan line signal. A second combining circuit 505y;505C combines the signal values of the first scan line signal b in the given field and the next succeeding scan line signal c in that field to form a second combined scan line signal. The first and second combined scan line signals are level adjusted and added to produce an interpolated scan line signal yc;Rc-yc/Bc-yc intermediate successive main scan lines in the given field.