Discrete cosine conversion circuit, discrete cosine inverse conversion circuit, MPEG video encoder and MPEG video decoder

摘要

A one-dimensional discrete cosine inverse transform circuit includes a group of multipliers that accept a plurality of input data provided in parallel with each other, and each of the multipliers multiplies a magnetic cosine integer with respect to input data to the multiplier and from the multiplier group. A group of adders and subtractors that receive the calculation result and add and subtract the calculation result to generate output data, and the output data includes a result of inverse transforming the input data by discrete cosine.