forked from buddhabrot/fusion-zauberstab
36 lines
716 B
C++
36 lines
716 B
C++
#pragma once
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template<class T>
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struct Biquad {
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T b0;
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T b1;
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T b2;
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T a1;
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T a2;
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T xn1;
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T xn2;
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T yn1;
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T yn2;
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Biquad() = default;
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Biquad(T a1, T a2, T b0, T b1, T b2) : b0(b0), b1(b1), b2(b2), a1(a1), a2(a2) {};
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Biquad(T a0, T a1, T a2, T b0, T b1, T b2) {
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this->a1 = a1/a0;
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this->a2 = a2/a0;
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this->b0 = b0/a0;
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this->b1 = b1/a0;
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this->b2 = b2/a0;
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}
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T update(T x) {
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T y = this->b0 * x + this->b1 * this->xn1 + this->b2 * this->xn2 - this->yn1 * this->a1 - this->yn2 * this->a2;
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this->xn2 = this->xn1;
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this->xn1 = x;
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this->yn2 = this->yn1;
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this->yn1 = y;
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return y;
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}
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}; |