Timbral_Metallic.py 文件源码

def butter_lowpass_filter(data, cutoff, fs, order=2):
    """
     This function designs a Butterworth lowpass filter and applies it to the data 

    :param data:    Audio data to be lowpass filtered
    :param cutoff:  Cutoff frequency in Hz
    :param fs:      Samplerate of audio
    :param order:   Order of the filter, defaults to second order filter as required by timbral_metallic
    :return:        Returns the filtered signal
    """
    b, a = butter_lowpass(cutoff, fs, order=order)
    y = lfilter(b, a, data)
    return y