gr_firdes Class Reference

#include <gr_firdes.h>

List of all members.

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Detailed Description

Finite Impulse Response (FIR) filter design functions.

Public Types
enum	win_type {   WIN_HAMMING = 0, WIN_HANN = 1, WIN_BLACKMAN = 2, WIN_RECTANGULAR = 3,   WIN_KAISER = 4 }
Static Public Member Functions
static std::vector< float >	low_pass (double gain, double sampling_freq, double cutoff_freq, double transition_width, win_type window=WIN_HAMMING, double beta=6.76)
	use "window method" to design a low-pass FIR filter
static std::vector< float >	high_pass (double gain, double sampling_freq, double cutoff_freq, double transition_width, win_type window=WIN_HAMMING, double beta=6.76)
	use "window method" to design a high-pass FIR filter
static std::vector< float >	band_pass (double gain, double sampling_freq, double low_cutoff_freq, double high_cutoff_freq, double transition_width, win_type window=WIN_HAMMING, double beta=6.76)
	use "window method" to design a band-pass FIR filter
static std::vector< gr_complex >	complex_band_pass (double gain, double sampling_freq, double low_cutoff_freq, double high_cutoff_freq, double transition_width, win_type window=WIN_HAMMING, double beta=6.76)
	use "window method" to design a complex band-pass FIR filter
static std::vector< float >	band_reject (double gain, double sampling_freq, double low_cutoff_freq, double high_cutoff_freq, double transition_width, win_type window=WIN_HAMMING, double beta=6.76)
	use "window method" to design a band-reject FIR filter
static std::vector< float >	hilbert (unsigned int ntaps, win_type windowtype=WIN_RECTANGULAR, double beta=6.76)
	design a Hilbert Transform Filter
static std::vector< float >	root_raised_cosine (double gain, double sampling_freq, double symbol_rate, double alpha, int ntaps)
	design a Root Cosine FIR Filter (do we need a window?)
static std::vector< float >	gaussian (double gain, double spb, double bt, int ntaps)
	design a Gaussian filter
static std::vector< float >	window (win_type type, int ntaps, double beta)

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Member Enumeration Documentation

enum gr_firdes::win_type

Enumeration values: WIN_HAMMING  WIN_HANN  WIN_BLACKMAN  WIN_RECTANGULAR  WIN_KAISER

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Member Function Documentation

vector< float > gr_firdes::band_pass (  double  gain, double  sampling_freq, double  low_cutoff_freq, double  high_cutoff_freq, double  transition_width, win_type  window = WIN_HAMMING, double  beta = 6.76 )  [static]

use "window method" to design a band-pass FIR filter gain: overall gain of filter (typically 1.0) sampling_freq: sampling freq (Hz) low_cutoff_freq: center of transition band (Hz) high_cutoff_freq: center of transition band (Hz) transition_width: width of transition band (Hz). The normalized width of the transition band is what sets the number of taps required. Narrow --> more taps window_type: What kind of window to use. Determines maximum attenuation and passband ripple. beta: parameter for Kaiser window

vector< float > gr_firdes::band_reject (  double  gain, double  sampling_freq, double  low_cutoff_freq, double  high_cutoff_freq, double  transition_width, win_type  window = WIN_HAMMING, double  beta = 6.76 )  [static]

use "window method" to design a band-reject FIR filter gain: overall gain of filter (typically 1.0) sampling_freq: sampling freq (Hz) low_cutoff_freq: center of transition band (Hz) high_cutoff_freq: center of transition band (Hz) transition_width: width of transition band (Hz). The normalized width of the transition band is what sets the number of taps required. Narrow --> more taps window_type: What kind of window to use. Determines maximum attenuation and passband ripple. beta: parameter for Kaiser window

vector< gr_complex > gr_firdes::complex_band_pass (  double  gain, double  sampling_freq, double  low_cutoff_freq, double  high_cutoff_freq, double  transition_width, win_type  window = WIN_HAMMING, double  beta = 6.76 )  [static]

use "window method" to design a complex band-pass FIR filter gain: overall gain of filter (typically 1.0) sampling_freq: sampling freq (Hz) low_cutoff_freq: center of transition band (Hz) high_cutoff_freq: center of transition band (Hz) transition_width: width of transition band (Hz). The normalized width of the transition band is what sets the number of taps required. Narrow --> more taps window_type: What kind of window to use. Determines maximum attenuation and passband ripple. beta: parameter for Kaiser window

vector< float > gr_firdes::gaussian (  double  gain, double  spb, double  bt, int  ntaps )  [static]

design a Gaussian filter gain: overall gain of filter (typically 1.0) symbols per bit: symbol rate, must be a factor of sample rate ntaps: number of taps

vector< float > gr_firdes::high_pass (  double  gain, double  sampling_freq, double  cutoff_freq, double  transition_width, win_type  window = WIN_HAMMING, double  beta = 6.76 )  [static]

use "window method" to design a high-pass FIR filter gain: overall gain of filter (typically 1.0) sampling_freq: sampling freq (Hz) cutoff_freq: center of transition band (Hz) transition_width: width of transition band (Hz). The normalized width of the transition band is what sets the number of taps required. Narrow --> more taps window_type: What kind of window to use. Determines maximum attenuation and passband ripple. beta: parameter for Kaiser window

vector< float > gr_firdes::hilbert (  unsigned int  ntaps, win_type  windowtype = WIN_RECTANGULAR, double  beta = 6.76 )  [static]

design a Hilbert Transform Filter ntaps: Number of taps, must be odd window_type: What kind of window to use beta: Only used for Kaiser

vector< float > gr_firdes::low_pass (  double  gain, double  sampling_freq, double  cutoff_freq, double  transition_width, win_type  window = WIN_HAMMING, double  beta = 6.76 )  [static]

use "window method" to design a low-pass FIR filter gain: overall gain of filter (typically 1.0) sampling_freq: sampling freq (Hz) cutoff_freq: center of transition band (Hz) transition_width: width of transition band (Hz). The normalized width of the transition band is what sets the number of taps required. Narrow --> more taps window_type: What kind of window to use. Determines maximum attenuation and passband ripple. beta: parameter for Kaiser window

vector< float > gr_firdes::root_raised_cosine (  double  gain, double  sampling_freq, double  symbol_rate, double  alpha, int  ntaps )  [static]

design a Root Cosine FIR Filter (do we need a window?) gain: overall gain of filter (typically 1.0) sampling_freq: sampling freq (Hz) symbol rate: symbol rate, must be a factor of sample rate alpha: excess bandwidth factor ntaps: number of taps

vector< float > gr_firdes::window (  win_type  type, int  ntaps, double  beta )  [static]

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The documentation for this class was generated from the following files:

• gr_firdes.h
• gr_firdes.cc

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