8 通道双正交余弦调制滤波器组实现，滤波器的采样频率为 Fs:20000Hz 设计的低通原型的通带频率为625Hz 阻带衰减80db，滤波器的系数长度为512 -8-channel biorthogonal cosine modulated filter banks achieve filter sampling frequency Fs: 20000Hz design of the low-pass prototype passband frequency of 625Hz stopban