Functions |
void | make_goertzel_descriptor (goertzel_descriptor_t *t, float freq, int samples) |
goertzel_state_t * | goertzel_init (goertzel_state_t *s, goertzel_descriptor_t *t) |
int | goertzel_release (goertzel_state_t *s) |
int | goertzel_free (goertzel_state_t *s) |
void | goertzel_reset (goertzel_state_t *s) |
int | goertzel_update (goertzel_state_t *s, const int16_t amp[], int samples) |
float | goertzel_result (goertzel_state_t *s) |
complexf_t | periodogram (const complexf_t coeffs[], const complexf_t amp[], int len) |
int | periodogram_prepare (complexf_t sum[], complexf_t diff[], const complexf_t amp[], int len) |
complexf_t | periodogram_apply (const complexf_t coeffs[], const complexf_t sum[], const complexf_t diff[], int len) |
int | periodogram_generate_coeffs (complexf_t coeffs[], float freq, int sample_rate, int window_len) |
float | periodogram_generate_phase_offset (complexf_t *offset, float freq, int sample_rate, int interval) |
float | periodogram_freq_error (const complexf_t *phase_offset, float scale, const complexf_t *last_result, const complexf_t *result) |