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57 lines
1.2 KiB
C++
57 lines
1.2 KiB
C++
/*
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Some window functions
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Copyright 2018 Ahmet Inan <inan@aicodix.de>
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*/
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#ifndef WINDOW_HH
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#define WINDOW_HH
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namespace DSP {
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template <int TAPS, typename TYPE>
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class Hann
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{
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TYPE w[TAPS];
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public:
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Hann()
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{
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for (int n = 0; n < TAPS; ++n)
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w[n] = TYPE(0.5) * (TYPE(1) - std::cos(TYPE(2) * TYPE(M_PI) * TYPE(n) / TYPE(TAPS - 1)));
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}
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inline TYPE operator () (int n) { return n >= 0 && n < TAPS ? w[n] : 0; }
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inline operator const TYPE * () const { return w; }
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};
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template <int TAPS, typename TYPE>
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class Hamming
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{
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TYPE w[TAPS];
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public:
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Hamming()
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{
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for (int n = 0; n < TAPS; ++n)
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w[n] = TYPE(0.54) - TYPE(0.46) * std::cos(TYPE(2) * TYPE(M_PI) * TYPE(n) / TYPE(TAPS - 1));
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}
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inline TYPE operator () (int n) { return n >= 0 && n < TAPS ? w[n] : 0; }
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inline operator const TYPE * () const { return w; }
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};
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template <int TAPS, typename TYPE>
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class Gauss
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{
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TYPE w[TAPS];
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public:
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Gauss(TYPE o)
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{
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for (int n = 0; n < TAPS; ++n)
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w[n] = std::exp(- TYPE(0.5) * std::pow((TYPE(n) - TYPE(TAPS - 1) / TYPE(2)) / (o * TYPE(TAPS - 1) / TYPE(2)), TYPE(2)));
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}
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inline TYPE operator () (int n) { return n >= 0 && n < TAPS ? w[n] : 0; }
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inline operator const TYPE * () const { return w; }
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};
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}
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#endif
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