Patent ID: 6108041
Filing Date: 2000-08-22
Classification: H04N

Abstract:
Apparatus for deriving a interlaced SDTV signal from a progressively-scanned television signal having substantially the number of active picture scanning lines in a frame as the interlaced SDTV signal has in a frame (i.e., two interlaced fields) and having a progressive scan frame rate substantially the same as the interlace field rate of the compatible standard-bandwidth television signal, said progressively-scanned television signal created by or derived from a HDTV source, comprisinga low-motion signal processor receiving the progressively-scanned television signal and providing a interlaced SDTV signal having a field rate substantially the same as said progressive scan frame rate, but in which changes in the television signal active picture information do not exceed the interlaced television signal frame rate, said low-motion signal processing path including a time-domain lowpass filter,a high-motion signal processor receiving the progressively-scanned television signal and providing a interlaced SDTV signal having a field rate substantially the same as said progressive scan frame rate, in which changes in the interlaced television signal active picture information may exceed the interlaced television signal frame rate but do not exceed the interlaced television signal field rate,a motion control generator receiving the progressively-scanned television signal and providing a motion control signal, derived from differences in picture information from frame to frame of said progressively-scanned television signal, indicating the degree of motion in said progressively-scanned television signal, anda switch, controlled by said motion control signal, receiving the signal output of said low-motion signal processor and the signal output of said high-motion signal processor for selecting either of said signal outputs or a mixture of said signal outputs, in accordance with the degree of motion indicated by said motion signal, to produce said interlaced SDTV signal, the signal having a varying motion resolution.