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added Lanczos window

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This commit is contained in:
Ahmet Inan 2018-03-03 12:37:30 +01:00
commit 573f52a574
1 changed files with 18 additions and 0 deletions
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18
window.hh
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@ -53,6 +53,24 @@ public:
inline operator const TYPE * () const { return w; }
};
template <int TAPS, typename TYPE>
class Lanczos
{
TYPE w[TAPS];
TYPE sinc(TYPE x)
{
return TYPE(0) == x ? TYPE(1) : std::sin(TYPE(M_PI) * x) / (TYPE(M_PI) * x);
}
public:
Lanczos()
{
for (int n = 0; n < TAPS; ++n)
w[n] = sinc(TYPE(2 * n) / TYPE(TAPS - 1) - TYPE(1));
}
inline TYPE operator () (int n) { return n >= 0 && n < TAPS ? w[n] : 0; }
inline operator const TYPE * () const { return w; }
};
template <int TAPS, typename TYPE>
class Gauss
{