30 lines
802 B
C
30 lines
802 B
C
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#pragma once
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class Biquad
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{
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public:
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Biquad();
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void copy_filter(const Biquad &other);
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void SetSampleRate(double fs);
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void set_freq(double f0);
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void set_s_eq(const double b[3], const double a[3]);
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void transform_s_to_z();
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void process_block(float *dest_ptr, const float *src_ptr, long nbr_spl);
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void clear_buffers();
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private:
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double _s_eq_b[3]; // Coefs for numerator (zeros)
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double _s_eq_a[3]; // Coefs for denominator (poles)
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double _z_eq_b[3]; // Direct coefficients, order z^(-n)
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double _z_eq_a[3]; // Recursive coefficients, order z^(-n)
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double sampleRate; // Hz, > 0
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double _f0; // Hz, > 0, _f0 % (_sample_freq/2) != 0
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double xn[2]; // Input memory, order z^(-n)
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double yn[2]; // Output memory, order z^(-n)
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int _mem_pos; // 0 or 1
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inline double process_sample(double x);
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};
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