| import scipy.signal as sps | |
| def preemphasis(x, preemph=0.97): | |
| ''' Perform high pass filtering on input signal | |
| :param x: signal to filter | |
| :param preemph: pre-emphasis factor | |
| :return: high pass filtered signal | |
| ''' | |
| return sps.lfilter([1, -preemph], [1], x) | |