#!/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


# In[ ]: