Video signal converting apparatus for converting an interlace video signal into a non-interlace video signal for reduction

A video signal converting apparatus for converting an interlace video signal into a non-interlace video signal for reduction, said apparatus comprising:

• a video decoder for receiving a composite video signal as an input and separating therefrom a horizontal synchronizing signal, a vertical synchronizing signal, and component video signals;
• an A/D converter for receiving said component video signals from said video decoder as inputs, performing A/D conversion, and outputting first video data;
• first means for converting said first video data from said A/D converter into second video data in the horizontal direction for reduction;
• a vertical coordinate conversion circuit for receiving said horizontal synchronizing signal and said vertical synchronizing signal from said video decoder as inputs and outputting a number of joined scan lines based on a display scan line vertical coordinate location and a frame coordinate system of the interlace video signal corresponding thereto in accordance with a previously given reduction ratio;
• a vertical filtering circuit for receiving said second video data from said first means and said number of joined scan lines from said vertical coordinate conversion circuit as inputs, calculating a number of joined input lines based on said number of joined scan lines, calculating an average value of dots between input scan lines for a portion of said second video data corresponding to said number of joined input lines, and outputting third video data;
• a frame buffer for writing thereinto said third video data from said vertical filtering circuit;
• and
• a control circuit for receiving a display scan line horizontal coordinate location and said display scan line vertical coordinate location from said vertical coordinate conversion circuit as inputs and controlling the writing of said third video data into said frame buffer based on each coordinate location.