double filter_spatial_response_calc(int filt_type, double x, double bw, double param, int n);
double filter_spatial_response_analytic(int filt_type, double x, double bw, double param);
double filter_frequency_response(int filt_type, double u, double bw, double param);
double filter_spatial_response_calc(int filt_type, double x, double bw, double param, int n);
double filter_spatial_response_analytic(int filt_type, double x, double bw, double param);
double filter_frequency_response(int filt_type, double u, double bw, double param);