ADAPTIVE SCANNING LINE CONVERTING CIRCUIT FOR A TELEVISION RECEIVER

A circuit and technique for using only a line memory that has small capacity and selecting a proper interpolation filter according to the correlationship of vertical and slanting directions between two scanning lines of input signals. This system performs the steps of applying interlaced scanning signals to an image signal delaying circuit having delaying elements, generating a plurality of signals according to each delay, filtering in a two dimensional space filter, detecting the correlationship of the vertical and slanting directions between the lines by logic operations of the delay signal, selecting a proper space filter of the two dimensional space filter in response to the detected signal and converting in time axis with the interlaced scanning signals and a signal properly generated through the interpolation filter of a filter selector, thereby economically obtaining a high quality picture image.