為了簡化傳統的DCT演算法,減少運算的複雜度,並且加快傳統DCT演算法的運算速度。在此設計前提之下,我們首先將輸入信號分解成多階層的信號再與SB_DCT及SB_DST運算。將輸入的信號分解成許多的子信號:ㄧ部分的子信號是原信號的平均,另一部份的子信號是原信號的差分,利用多階層的運算達到加快傳統DCT運算的速度與大幅降低運算的複雜度。 DCT (Discrete Cosine Transforms) and IDCT (Inverse Discrete Cosine Transforms) are widely used for digital signal and image processing. Computational efficiency of DCT and IDCT dominate the performance of processing. How to improve computational effici