gr_remez.h File Reference

#include <gr_types.h>
#include <string>
#include <stdexcept>

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Functions
std::vector< double >	gr_remez (int order, const std::vector< double > &bands, const std::vector< double > &ampl, const std::vector< double > &error_weight, const std::string filter_type="bandpass", int grid_density=16) throw (std::runtime_error)
	Parks-McClellan FIR filter design.

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Function Documentation

std::vector<double> gr_remez (  int  order, const std::vector< double > &  bands, const std::vector< double > &  ampl, const std::vector< double > &  error_weight, const std::string  filter_type = "bandpass", int  grid_density = 16 )  throw (std::runtime_error)

Parks-McClellan FIR filter design. Calculates the optimal (in the Chebyshev/minimax sense) FIR filter inpulse reponse given a set of band edges, the desired reponse on those bands, and the weight given to the error in those bands. Parameters: order  filter order (number of taps in the returned filter - 1) bands  frequency at the band edges [ b1 e1 b2 e2 b3 e3 ...] ampl  desired amplitude at the band edges [ a(b1) a(e1) a(b2) a(e2) ...] error_weight  weighting applied to each band (usually 1) filter_type  one of "bandpass", "hilbert" or "differentiator" grid_density  determines how accurately the filter will be constructed. \ The minimum value is 16; higher values are slower to compute. Frequency is in the range [0, 1], with 1 being the Nyquist frequency (Fs/2) Returns: vector of computed taps Exceptions: std::runtime_error  if args are invalid or calculation fails to converge.

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