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高质量的数字音频编解码一般都采用频域子带编解码算法 .以 MPEG- 2 Audio Layer 标准为基础 ,推导了在高质量数字音频编解码算法的子带合成滤波器模块中改进的反向离散余弦变换 ( IMDCT)快速算法 ,并讨论了加窗运算的技巧及其在定点数字信息处理 ( DSP)中实现的具体方法 .在保证运算精度的前提下 ,该基于 IDCT的快速算法在 DSP实时实现中大约可减少 2 /3的运算量与 4/5存储空间
High-quality digital audio codecs generally use frequency-domain sub-band coding and decoding algorithms.On the basis of the MPEG-2 Audio Layer standard, the improved inverse of the sub-band synthesis filter module for high-quality digital audio codec algorithms Discrete cosine transform (IMDCT) fast algorithm, and discusses the windowing technique and its implementation in the fixed-point digital information processing (DSP) specific method.In the premise of ensuring the accuracy of the operation, the IDCT-based fast algorithm in the DSP real-time Approximately 2/3 reduction in computation and 4/5 of storage can be achieved in the implementation