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00023 #ifndef _GR_FIRDES_H_
00024 #define _GR_FIRDES_H_
00025 
00026 #include <vector>
00027 #include <cmath>
00028 using std::vector;
00029 
00034 class gr_firdes {
00035  public:
00036 
00037   enum win_type {
00038     WIN_HAMMING = 0,    
00039     WIN_HANN = 1,       
00040     WIN_BLACKMAN = 2,   
00041     WIN_RECTANGULAR = 3
00042   };
00043 
00044   
00045 
00060   static vector<float>
00061   low_pass (double gain,
00062             double sampling_freq,
00063             double cutoff_freq,         
00064             double transition_width,    
00065             win_type window = WIN_HAMMING,
00066             double beta = 6.76);                
00067 
00082   static vector<float>
00083   high_pass (double gain,
00084              double sampling_freq,
00085              double cutoff_freq,                
00086              double transition_width,           
00087              win_type window = WIN_HAMMING,
00088              double beta = 6.76);               
00089 
00105   static vector<float>
00106   band_pass (double gain,
00107              double sampling_freq,
00108              double low_cutoff_freq,            
00109              double high_cutoff_freq,           
00110              double transition_width,           
00111              win_type window = WIN_HAMMING,
00112              double beta = 6.76);               
00113 
00114 
00130   static vector<float>
00131   band_reject (double gain,
00132                double sampling_freq,
00133                double low_cutoff_freq,          
00134                double high_cutoff_freq,         
00135                double transition_width,         
00136                win_type window = WIN_HAMMING,
00137                double beta = 6.76);             
00138 
00145   static vector<float>
00146   hilbert (unsigned int ntaps,
00147            win_type windowtype = WIN_RECTANGULAR,
00148            double beta = 6.76);
00149    
00159   static vector<float>
00160   root_raised_cosine (double gain,
00161                       double sampling_freq,
00162                       double symbol_rate,       
00163                       double alpha,             
00164                       int ntaps);
00165 
00174   static vector<float>
00175   gaussian (double gain,
00176             double sampling_freq,
00177             double symbol_rate,       
00178             double bt,              
00179             int ntaps);
00180 
00181   
00182   static vector<float> gr_firdes::window (win_type type, int ntaps, double beta);
00183 
00184 private:
00185   static void sanity_check_1f (double sampling_freq, double f1,
00186                                double transition_width);
00187   static void sanity_check_2f (double sampling_freq, double f1, double f2,
00188                                double transition_width);
00189 
00190   static int compute_ntaps (double sampling_freq,
00191                             double transition_width,
00192                             win_type window_type, double beta);
00193 };
00194 
00195 #endif