DOWN CONVERSION DECODING DEVICE OF DIGITAL TELEVISION

The disclosure is a down conversion decoding device of the digital television having an effect capable of obtaining a picture of the high quality no less than that of the full-memory version while reducing the size of the memory, by changing the size of the required memory according to the type of the frame to be input after the DCT coefficients are horizontally filtered. Furthermore, if the display format is the sequential scanning, there is no need to perform the vertical filtering and decimation for the I and P frames thereby, enhancing the picture quality and also, the format conversion unit can perform the only first interpolation without the additional interlacing process thereby, reducing the size of the memory in the format conversion unit.