void read_config (double *fc, double *velocity, double *sample_rate, int *path_num,
				  double *gain, double *delay);
void SetJake(JakeSt *p_jake, int osci_num, double sample_rate, double fmax, double sigma);
void RunJake(JakeSt *p_jake, double *inph, double *quad);
void SetMultiPath();
void RunMultiPath(double inph_in, double quad_in, double *inph_out, double *quad_out);