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   "source": [
    "# import scipy.signal\n",
    "\n",
    "# def high_pass_filter(audio, sr, cutoff=200, order=3):\n",
    "#     \"\"\"\n",
    "#     Applies a high-pass filter to an audio signal.\n",
    "\n",
    "#     Parameters:\n",
    "#     audio (numpy array): The input audio signal.\n",
    "#     sr (int): The sample rate of the audio signal.\n",
    "#     cutoff (float): The cutoff frequency in Hz. Default is 100 Hz.\n",
    "#     order (int): The order of the filter. Default is 5.\n",
    "    \n",
    "#     Returns:\n",
    "#     numpy array: The filtered audio signal.\n",
    "#     \"\"\"\n",
    "#     # Design the high-pass filter using a Butterworth filter design\n",
    "#     sos = scipy.signal.butter(order, cutoff, btype='highpass', fs=sr, output='sos')\n",
    "    \n",
    "#     # Apply the filter using sosfilt (second-order sections filter)\n",
    "#     filtered_audio = scipy.signal.sosfilt(sos, audio)\n",
    "    \n",
    "#     return filtered_audio"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "8a1efa78-61d4-4545-b50a-080161bb6aa5",
   "metadata": {},
   "outputs": [],
   "source": [
    "def high_pass_filter(audio, sr, cutoff=300):\n",
    "    # Design a Butterworth high-pass filter\n",
    "    nyquist = 0.5 * sr\n",
    "    normal_cutoff = cutoff / nyquist\n",
    "    b, a = butter(1, normal_cutoff, btype='high', analog=False)\n",
    "    filtered_audio = lfilter(b, a, audio)\n",
    "    return filtered_audio"
   ]
  }
 ],
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