python代码分别实现了频域Gammtone滤波和时域Gammtone滤波器，频域滤波时参数USEFFT=1。其中MakeERBFilters函数产生了GT滤波器系数。输入为：采样频率、滤波器通道数、最小频率。输出为：n通道GT滤波器系数。(The python code implements frequency-domain Gammtone filtering and time-domain Gammtone filters, respectively, and the parameter USEFFT=1 in the frequency domain filtering. The MakeERBFilters function generates GT filter coefficients. The inputs are: sampling frequency, number of filter channels, minimum frequency. The output is: n-channel GT filter coefficients.)