A digital video signal is real-time converted from a high definition format (such as 1250 lines, 50 field/s, 2:1 interlace, with a 16:9 aspect ratio) to a conventional definition format (such as 525 lines, 60 field/s, 2:1 interlace, with a 4:3 aspect ratio) by compressing the image so that the active...http://www.google.fr/patents/US5327235?utm_source=gb-gplus-shareBrevet US5327235 - Video conversions of video signal formats
