Finite Impulse Response (FIR) filter design functions. More...
#include <gnuradio/filter/firdes.h>
Public Types  
enum  win_type { WIN_NONE = 1, WIN_HAMMING = 0, WIN_HANN = 1, WIN_BLACKMAN = 2, WIN_RECTANGULAR = 3, WIN_KAISER = 4, WIN_BLACKMAN_hARRIS = 5, WIN_BLACKMAN_HARRIS = 5, WIN_BARTLETT = 6, WIN_FLATTOP = 7 } 
Static Public Member Functions  
static std::vector< float >  window (win_type type, int ntaps, double beta) 
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 lowpass FIR filter. The normalized width of the transition band is what sets the number of taps required. Narrow –> more taps. Window type determines maximum attenuation and passband ripple. More...  
static std::vector< float >  low_pass_2 (double gain, double sampling_freq, double cutoff_freq, double transition_width, double attenuation_dB, win_type window=WIN_HAMMING, double beta=6.76) 
Use "window method" to design a lowpass FIR filter. The normalized width of the transition band and the required stop band attenuation is what sets the number of taps required. Narrow –> more taps More attenuation –> more taps. The window type determines maximum attentuation and passband ripple. More...  
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 highpass FIR filter. The normalized width of the transition band is what sets the number of taps required. Narrow –> more taps. The window determines maximum attenuation and passband ripple. More...  
static std::vector< float >  high_pass_2 (double gain, double sampling_freq, double cutoff_freq, double transition_width, double attenuation_dB, win_type window=WIN_HAMMING, double beta=6.76) 
Use "window method" to design a highpass FIR filter. The normalized width of the transition band and the required stop band attenuation is what sets the number of taps required. Narrow –> more taps More attenuation –> more taps. The window determines maximum attenuation and passband ripple. More...  
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 bandpass FIR filter. The normalized width of the transition band is what sets the number of taps required. Narrow –> more taps. The window determines maximum attenuation and passband ripple. More...  
static std::vector< float >  band_pass_2 (double gain, double sampling_freq, double low_cutoff_freq, double high_cutoff_freq, double transition_width, double attenuation_dB, win_type window=WIN_HAMMING, double beta=6.76) 
Use "window method" to design a bandpass FIR filter. The normalized width of the transition band and the required stop band attenuation is what sets the number of taps required. Narrow –> more taps. More attenuation –> more taps. Window type determines maximum attenuation and passband ripple. More...  
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 the "window method" to design a complex bandpass FIR filter. The normalized width of the transition band is what sets the number of taps required. Narrow –> more taps. The window type determines maximum attenuation and passband ripple. More...  
static std::vector< gr_complex >  complex_band_pass_2 (double gain, double sampling_freq, double low_cutoff_freq, double high_cutoff_freq, double transition_width, double attenuation_dB, win_type window=WIN_HAMMING, double beta=6.76) 
Use "window method" to design a complex bandpass FIR filter. The normalized width of the transition band and the required stop band attenuation is what sets the number of taps required. Narrow –> more taps More attenuation –> more taps. Window type determines maximum attenuation and passband ripple. More...  
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 bandreject FIR filter. The normalized width of the transition band is what sets the number of taps required. Narrow –> more taps. Window type determines maximum attenuation and passband ripple. More...  
static std::vector< float >  band_reject_2 (double gain, double sampling_freq, double low_cutoff_freq, double high_cutoff_freq, double transition_width, double attenuation_dB, win_type window=WIN_HAMMING, double beta=6.76) 
Use "window method" to design a bandreject FIR filter. The normalized width of the transition band and the required stop band attenuation is what sets the number of taps required. Narrow –> more taps More attenuation –> more taps. Window type determines maximum attenuation and passband ripple. More...  
static std::vector< float >  hilbert (unsigned int ntaps=19, win_type windowtype=WIN_RECTANGULAR, double beta=6.76) 
design a Hilbert Transform Filter More...  
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?) More...  
static std::vector< float >  gaussian (double gain, double spb, double bt, int ntaps) 
design a Gaussian filter More...  
Finite Impulse Response (FIR) filter design functions.

static 
Use "window method" to design a bandpass FIR filter. The normalized width of the transition band is what sets the number of taps required. Narrow –> more taps. The window determines maximum attenuation and passband ripple.
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). 
window  one of firdes::win_type 
beta  parameter for Kaiser window 

static 
Use "window method" to design a bandpass FIR filter. The normalized width of the transition band and the required stop band attenuation is what sets the number of taps required. Narrow –> more taps. More attenuation –> more taps. Window type determines maximum attenuation and passband ripple.
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). 
attenuation_dB  out of band attenuation 
window  one of firdes::win_type 
beta  parameter for Kaiser window 

static 
Use "window method" to design a bandreject FIR filter. The normalized width of the transition band is what sets the number of taps required. Narrow –> more taps. Window type determines maximum attenuation and passband ripple.
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) 
window  one of firdes::win_type 
beta  parameter for Kaiser window 

static 
Use "window method" to design a bandreject FIR filter. The normalized width of the transition band and the required stop band attenuation is what sets the number of taps required. Narrow –> more taps More attenuation –> more taps. Window type determines maximum attenuation and passband ripple.
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). 
attenuation_dB  out of band attenuation 
window  one of firdes::win_type 
beta  parameter for Kaiser window 

static 
Use the "window method" to design a complex bandpass FIR filter. The normalized width of the transition band is what sets the number of taps required. Narrow –> more taps. The window type determines maximum attenuation and passband ripple.
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) 
window  one of firdes::win_type 
beta  parameter for Kaiser window 

static 
Use "window method" to design a complex bandpass FIR filter. The normalized width of the transition band and the required stop band attenuation is what sets the number of taps required. Narrow –> more taps More attenuation –> more taps. Window type determines maximum attenuation and passband ripple.
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) 
attenuation_dB  out of band attenuation 
window  one of firdes::win_type 
beta  parameter for Kaiser window 

static 
design a Gaussian filter
gain  overall gain of filter (typically 1.0) 
spb  symbol rate, must be a factor of sample rate 
bt  bandwidth to bitrate ratio 
ntaps  number of taps 

static 
Use "window method" to design a highpass FIR filter. The normalized width of the transition band is what sets the number of taps required. Narrow –> more taps. The window determines maximum attenuation and passband ripple.
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) 
window  one of firdes::win_type 
beta  parameter for Kaiser window 

static 
Use "window method" to design a highpass FIR filter. The normalized width of the transition band and the required stop band attenuation is what sets the number of taps required. Narrow –> more taps More attenuation –> more taps. The window determines maximum attenuation and passband ripple.
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). 
attenuation_dB  out of band attenuation 
window  one of firdes::win_type 
beta  parameter for Kaiser window 

static 
design a Hilbert Transform Filter
ntaps  number of taps, must be odd 
windowtype  one kind of firdes::win_type 
beta  parameter for Kaiser window 

static 
Use "window method" to design a lowpass FIR filter. The normalized width of the transition band is what sets the number of taps required. Narrow –> more taps. Window type determines maximum attenuation and passband ripple.
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) 
window  one of firdes::win_type 
beta  parameter for Kaiser window 

static 
Use "window method" to design a lowpass FIR filter. The normalized width of the transition band and the required stop band attenuation is what sets the number of taps required. Narrow –> more taps More attenuation –> more taps. The window type determines maximum attentuation and passband ripple.
gain  overall gain of filter (typically 1.0) 
sampling_freq  sampling freq (Hz) 
cutoff_freq  beginning of transition band (Hz) 
transition_width  width of transition band (Hz) 
attenuation_dB  required stopband attenuation 
window  one of firdes::win_type 
beta  parameter for Kaiser window 

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 

static 