快速离散余弦变换算法在MP3编码中的实现

Implementation of Fast Discrete Cosine Transform Algorithm in MP3 Encode

在MP3编码中,子带分析滤波器是最主要的模块之一.根据MPEG标准算法,该模块的运算量约占了MP3编码总运算量的25%,而子带分析滤波算法最核心的部分就是离散余弦变换.提出了一个适合在DSP上实现的快速离散余弦变换算法,算法在保证精度的前提下,减少了运算量和存储量.

Subband analysis filter bank is one of the most important modules in MP3 encode.It's operation almost reach 25 percent of the total operation in MP3 encode.And the most core part of subband analysis filter bank is discrete cosine transform.Fast discrete cosine transform algorithm for DSP is proposed.While guaranteeing the computing precision,the proposed algorithm can reduce the operation and memory space.