Abstract: Disclosed is a device to convert a piece of motion information into a motion information signal at the field rate and with the number of lines desired for a high-definition television receiver. This device comprises:at least two memories for the storage, at the field rate of the input video signal, of respectively pieces of data pertaining to the information on motion of the even fields and pieces of data pertaining to the information on motion of the odd fields, these memories being read at the field rate of the video signal to be displayed, anda processing circuit connected to the output of the memories, said circuit delivering, from motion information read at the desired field rate, a motion information signal, at the field rate and with the number of lines desired, that is synchronous with the video signal to be displayed.