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#!/usr/bin/env python
# coding: utf-8
# In[2]:
import scipy.signal
def high_pass_filter(audio, sr, cutoff=100, order=5):
"""
Applies a high-pass filter to an audio signal.
Parameters:
audio (numpy array): The input audio signal.
sr (int): The sample rate of the audio signal.
cutoff (float): The cutoff frequency in Hz. Default is 100 Hz.
order (int): The order of the filter. Default is 5.
Returns:
numpy array: The filtered audio signal.
"""
# Design the high-pass filter using a Butterworth filter design
sos = scipy.signal.butter(order, cutoff, btype='highpass', fs=sr, output='sos')
# Apply the filter using sosfilt (second-order sections filter)
filtered_audio = scipy.signal.sosfilt(sos, audio)
return filtered_audio
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