highPassFilter.py

from scipy.signal import butter, lfilter

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


def high_pass_filter(audio, sr, cutoff=300):
    # Design a Butterworth high-pass filter
    nyquist = 0.5 * sr
    normal_cutoff = cutoff / nyquist
    b, a = butter(1, normal_cutoff, btype='high', analog=False)
    filtered_audio = lfilter(b, a, audio)
    return filtered_audio