Video decoding device for digital television receiver

The device separates the I and P pictures from the B pictures, of a received high definition signal, downsamples horizontally to standard definition requirements, and converts the downsampled pictures into a display size that is matched to a screen size and format. The device comprises a downsampling arrangement (301,304a,312) for downsampling the input data in the unit, or block, at a predetermined ratio. A display size converter divides the downsampling result into two data groups. After downsampling the first data group, the converter performs a screen format conversion for the downsampled first data group, into a display size and aspect ratio. There is also a memory (306) for storing the converted first data group and the second data group. An output part is used for downsampling the second data group, to correspond with the first group of data, to perform a screen format conversion for the downsampled second data group when the data is reproduced. This also outputs the first and second data groups.