{
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  {
   "cell_type": "markdown",
   "id": "bcd07c1e-6722-44c7-b162-267f1341c2fe",
   "metadata": {},
   "source": [
    "# Frequency weighting plots"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "f0c4d6ef-69b2-4b5c-92fd-d987a11f3cbd",
   "metadata": {},
   "outputs": [],
   "source": [
    "# Prerequisites, uncomment below in case of errors. Also for ipympl, restart Jupyter Lab if it was not installed\n",
    "\n",
    "!cd .. && maturin develop -F python-bindings\n",
    "#!pip install ipympl scipy matplotlib"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "23b45cf6-85bc-4eaa-8f27-77c5b354e772",
   "metadata": {},
   "outputs": [],
   "source": [
    "# If this does not work, install ipympl and reboot Jupyter Lab\n",
    "%matplotlib widget"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "96090ac9-2033-411d-8e45-0c6b375a268b",
   "metadata": {},
   "outputs": [],
   "source": [
    "import numpy as np\n",
    "import matplotlib.pyplot as plt\n",
    "from numpy import log10\n",
    "from lasprs import ZPKModel, FreqWeighting\n",
    "def level(a):\n",
    "    return 20*np.log10(np.abs(a))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "52343e3d-63ef-4fc2-ad7e-85ca124efdac",
   "metadata": {},
   "outputs": [],
   "source": [
    "A = ZPKModel.freqWeightingFilter(FreqWeighting.A)\n",
    "C = ZPKModel.freqWeightingFilter(FreqWeighting.C)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "7d3cc799-4809-4ea4-8570-89ffbb751a5a",
   "metadata": {},
   "outputs": [],
   "source": [
    "freq = np.logspace(log10(2), log10(2e4), 200)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "ab22d9cc-03ae-4d58-b730-599b659f9dc0",
   "metadata": {},
   "outputs": [],
   "source": [
    "plt.figure()\n",
    "plt.title('Frequency response of weighting filters - magnitude')\n",
    "plt.semilogx(freq, level(A.tf(0, freq)))\n",
    "plt.semilogx(freq, level(C.tf(0, freq)))\n",
    "plt.legend(['A-weighting', 'Z-weighting'])\n",
    "plt.ylabel('Magnitude [dB]')\n",
    "plt.ylim(-50, 3)\n",
    "plt.xlabel('Freq. [Hz]')"
   ]
  }
 ],
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