Desktop/PPP/python/audio/sin.ipynb

sin.ipynb

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      "source": "\"\"\"任意の波の生成\"\"\"\n\n# 振幅, 周波数, 位相, 時間\n# y = Asin(ωt + φ)\n\nimport numpy as np\n\nsr = 44100 # サンプリング周波数\nfrq = 440    # 波形の周波数\n\ndef genSinWav(amp, frq, sr, t, quant_byte_type):\n\n    # サンプリング周波数毎のフレームの作成 \n    rad = np.linspace(0, 2*np.pi * frq * t, sr * t)\n    \n    # sin波の作成\n    y1 = np.sin(rad) * amp\n    \n    # 量子化\n    y2 = (y1 * np.iinfo(quant_byte_type).max).astype(np.int16)\n    \n    # ステレオにする\n    return np.array(np.c_[y2,y2])\n\ngenSinWav(0.5, 440, 44100, 2, np.int16)",
      "execution_count": 1,
      "outputs": [
        {
          "output_type": "execute_result",
          "execution_count": 1,
          "data": {
            "text/plain": "array([[    0,     0],\n       [ 1026,  1026],\n       [ 2048,  2048],\n       ...,\n       [-2048, -2048],\n       [-1026, -1026],\n       [    0,     0]], dtype=int16)"
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    {
      "metadata": {
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      "cell_type": "code",
      "source": "import scipy.io.wavfile as siw\n# 作成した波を保存\nw = genSinWav(0.5, frq, sr, 2, np.int16)\nsiw.write(\"sin_440Hz.wav\", sr, w)",
      "execution_count": 2,
      "outputs": []
    },
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