A method and apparatus for implementing a discrete cosine transform (DCT) or an inverse DCT (IDCT) with a single hardware unit which applies only positive valued multiplicative coefficients and can be switched to either perform a DCT or an IDCT. The invention processes parallel input digital data signals...http://www.google.es/patents/US5452466?utm_source=gb-gplus-sharePatente US5452466 - Method and apparatus for preforming DCT and IDCT transforms on data signals with a preprocessor, a post-processor, and a controllable shuffle-exchange unit connected between the pre-processor and post-processor
Method and apparatus for preforming DCT and IDCT transforms on data signals ...
