Matrix multiplier and picture transforming coder using the same

摘要

A matrix multiplier used in a picture transforming coder is provided for multiplying an input signal matrix by a coefficient matrix configured to comprise as many constant multipliers as absolute values of coefficients in the transform coefficient matrix for handling the signal matrix as common multiplicands, a plurality of selectors for selecting values necessary for computing elements of the matrix product from multiplication results output by the constant multipliers and a respective accumulator assigned to each of the selectors for accumulating the selected values to finally provide an element of the matrix product. As a result, since the processing can be done by merely performing as many fixed multiplications as absolute values of the coefficients in the transform coefficient matrix, the multipliers can be implemented as a relatively simple combination of adders, allowing the entire size of a picture information transforming coder or the like to be reduced.