namespace NSpeex
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{
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using System;
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internal class Misc
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{
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public static float[] LagWindow(int lpcSize, float lagFactor)
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{
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float[] numArray = new float[lpcSize + 1];
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for (int i = 0; i < (lpcSize + 1); i++)
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{
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numArray[i] = (float)Math.Exp((-0.5 * ((6.2831853071795862 * lagFactor) * i)) * ((6.2831853071795862 * lagFactor) * i));
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}
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return numArray;
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}
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public static float[] Window(int windowSize, int subFrameSize)
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{
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int num;
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int num2 = (subFrameSize * 7) / 2;
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int num3 = (subFrameSize * 5) / 2;
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float[] numArray = new float[windowSize];
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for (num = 0; num < num2; num++)
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{
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numArray[num] = (float)(0.54 - (0.46 * Math.Cos((3.1415926535897931 * num) / ((double)num2))));
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}
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for (num = 0; num < num3; num++)
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{
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numArray[num2 + num] = (float)(0.54 + (0.46 * Math.Cos((3.1415926535897931 * num) / ((double)num3))));
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}
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return numArray;
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}
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}
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}
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