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typedef struct biquad_low_pass {
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double a0, a1, a2, b1, b2;
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double z1[10], z2[10];
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} biquad_low_pass_t;
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void biquad_init(biquad_low_pass_t *bq, double frequency, int samplerate);
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void biquad_process(biquad_low_pass_t *bq, double *samples, int length, int iterations);
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