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typedef struct emphasis {
struct {
double x_last;
double factor;
double amp;
} p;
struct {
iir_filter_t hp;
double y_last;
double factor;
double amp;
} d;
} emphasis_t;
#define CUT_OFF_EMPHASIS_DEFAULT 300.0
int init_emphasis(emphasis_t *state, int samplerate, double cut_off);
void pre_emphasis(emphasis_t *state, sample_t *samples, int num);
void de_emphasis(emphasis_t *state, sample_t *samples, int num);
void dc_filter(emphasis_t *state, sample_t *samples, int num);
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