Abstract: A device for conversion of frame frequency and number of lines for a high-definition television receiver which receives input video signals corresponding to different standards and to output a high-definition signal at a desired frame frequency and with the desired number of lines. The device uses a pass-band reduction decoder processing the high-definition input 625/2:1/50 Hz video signals. It includes: a memory, a decoder, and a processing circuit. The memory stores the input video signal frames at a frequency which is a function of the frame frequency of the input signal. This memory is read at the frame frequency desired at the output. The decoder is a pass-band reduction decoder connected to the memory and gives separately at its outputs even and odd frames, respectively, of a decompressed high-definition video signal output at the frame frequency desired.