MDCT快速算法的定点实现和相关算法文档资料，MDCT广泛应用于当前主流的音频编解码算法中。-Express MDCT algorithm implementation and related fixed-point algorithm documentation, MDCT is widely used in the current mainstream audio codec algorithm.

实现正弦信号的采样和快速傅里叶变换，效率非常高，可以运行。-Sinusoidal signal sampling and fast Fourier transform