A fast algorithm of integer MDCT for lossless audio coding
Haibin Huang, Susanto Rahardja, Rongshan Yu, Lin Xiao · 2004
A new fast algorithm to implement integer modified discrete cosine transform (IntMDCT) is proposed. It is shown that the total rounding operations required for this algorithm are only 2.5N, where N is the block size. As a result, its approximation error is far less than that of directly converted integer transforms. At the same time, the complexity is greatly reduced, which results in improved performance of a lossless audio coding system employing the IntMDCT in terms of compression ratio and complexity costs.