FREQUENCY DEMULTIPLIER FOR DIGITAL SIGNAL AND FREQUENCY DEMULTIPLYING METHOD FOR DIGITAL SIGNAL

摘要

PROBLEM TO BE SOLVED: To reduce the distortion of a block edge effect and the others and to provide a high processing speed. SOLUTION: A synthesizer 32 and a demultiplier 12 are provided. The synthesizer 32 receives digital video signals including at least the first and second DCT(discrete cosine transformation) blocks of a DCT coefficient, synthesizes the first and second DCT blocks and turns them to one synthetic DCT block provided with a dimension equal to the first and second DCT blocks. The demultiplier 12 generates output digital video signals by converting the synthetic DCT block from a DCT area to a space area.