public ZohNosdacCompensation(int length)
{
Taps = length;
switch (length)
{
case 9:
mCoeffs = new double[9];
Array.Copy(mCoeffs9, mCoeffs, mCoeffs9.Length);
break;
case 17:
mCoeffs = new double[17];
Array.Copy(mCoeffs17, mCoeffs, mCoeffs17.Length);
mCoeffs = mCoeffs17;
break;
case 33:
mCoeffs = new double[33];
Array.Copy(mCoeffs33, mCoeffs, mCoeffs33.Length);
/* フィルター係数が、DCゲインが1.0になるようにスケールする。
* */
for (int i = 0; i < mCoeffs.Length; ++i)
{
mCoeffs[i] *= 1.5405388308838;
}
break;
default:
throw new System.ArgumentException("length");
}
mDelay = new WWUtil.Delay(length);
mDelay.FillZeroes();
}
/// <summary>
/// 偶関数のFIRフィルター。
/// </summary>
/// <param name="parity">係数の数が奇数か偶数か。奇数の時フィルター係数の総数はhalfCoeffs*2-1。</param>
/// <param name="halfCoeffs">フィルター係数の半分または半分+1個</param>
public SymmetricalFIR(WWMath.WWParity parity, double[] halfCoeffs)
{
// halfCoeffs.Length=3のとき coeffのLength=5
// mDelayの蓄積サンプル数=5
mHalfCoeffs = halfCoeffs;
mParity = parity;
if (mParity == WWMath.WWParity.Odd)
{
mDelay = new WWUtil.Delay(mHalfCoeffs.Length * 2 - 1);
}
else
{
mDelay = new WWUtil.Delay(mHalfCoeffs.Length * 2);
}
mDelay.FillZeroes();
}