TW252258B - Two dimensional discrete cosine transform/inverse discrete cosine transform circuit - Google Patents

Abstract

A real-time two dimensional discrete cosine transform/inverse discrete cosine transform circuit includes: - a rate dual ports buffer for writing a set of NxN word data block with the first speed, after adjusting the data block, then outputting the first one dimensional data with the second speed; - a selector with two input ports among which one port is coupled to the rate dual ports buffer for supplying the first one dimensional data flow in the fist time period, and supplying the second one dimensional data flow from another input port in the second time period; - a one dimensional DCT/IDCT operator coupled to the selector for operating the one dimensional data supplied from the selector; - a row-column transpose buffer coupled to the DCT/IDCT operator for transposing the first one dimensional data after the DCT/IDCT operation and forming the second one dimensional data to the selector; - a inverse rate dual ports buffer coupled to the DCT/IDCT operator for outputting the second one dimensional data after the DCT/IDCT operator with the first speed.