TWO-DIMENSIONAL REVERSE DISCRETE COSINE TRANSFORMATION CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide a two-dimensional(2D) reverse discrete cosine transformation circuit capable of reducing operation quantity by omitting operation when zero is included in input data in a tensor product competing element and attaining high speed operation. SOLUTION: First to 9th judging devices for respectively inputting input data from 1st to 9th tensor product computing elements check whether respective input data are non-zero data or not and inform the corresponding tensor product computing elements of the judged results. When all input data are judged as zeros by the 1st to 9th judging devices, tensor product operation is not executed by the 1st to 9th tensor computing elements.