Inverse discrete cosine transform processor

Details Inverse discrete cosine transform processor Inverse discrete cosine transform processor

H - Electricity

04

N

H04N 7/12 (2006.01) G06F 17/14 (2006.01) H04N 7/015 (2006.01) H04N 7/50 (2006.01)

Patent

CA 2121197

A method and apparatus are provided for inverse transforming a matrix of discrete cosine transform (DCT) coefficients. The DCT coefficients are processed at least two bits at a time to obtain the vector dot products thereof with a DCT kernel matrix. A matrix of the vector dot products is transposed to obtain a transposed matrix of dot product elements. The dot product elements of the transposed matrix are processed at least two bits at a time to obtain the vector dot products thereof with the DCT kernel matrix. The resultant dot products are interleaved into a proper order and buffered in a series of output registers. Further efficiencies are achieved by implementing a post-add stage of an IDCT flowgraph prior to the output registers.

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