/* -*- C++ -*- */
+/*
+ * Copyright 2002,2008 Free Software Foundation, Inc.
+ *
+ * This file is part of GNU Radio
+ *
+ * GNU Radio is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3, or (at your option)
+ * any later version.
+ *
+ * GNU Radio is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Radio; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street,
+ * Boston, MA 02110-1301, USA.
+ */
/*!
* \brief Finite Impulse Response (FIR) filter design functions.
WIN_HANN = 1, // max attenuation 44 dB
WIN_BLACKMAN = 2, // max attenuation 74 dB
WIN_RECTANGULAR = 3,
- WIN_KAISER = 4 // max attenuation variable with beta, google it
+ WIN_KAISER = 4, // max attenuation variable with beta, google it
+ WIN_BLACKMAN_hARRIS = 5,
};
// ... class methods ...
* \p transition_width: width of transition band (Hz).
* \p attenuation_dB out of band attenuation
* The normalized width of the transition
- * band is what sets the number of taps
+ * band and the required stop band
+ * attenuation is what sets the number of taps
* required. Narrow --> more taps
- * \p attenuation_dB The required stop band attenuation in dB
+ * More attenuation --> more taps
* \p window_type: What kind of window to use. Determines
* maximum attenuation and passband ripple.
* \p beta: parameter for Kaiser window
* maximum attenuation and passband ripple.
* \p beta: parameter for Kaiser window
*/
+
static std::vector<float>
high_pass (double gain,
double sampling_freq,
double beta = 6.76 // used only with Kaiser
) throw(std::out_of_range);
+ /*!
+ * \brief use "window method" to design a high-pass FIR filter
+ *
+ * \p gain: overall gain of filter (typically 1.0)
+ * \p sampling_freq: sampling freq (Hz)
+ * \p cutoff_freq: center of transition band (Hz)
+ * \p transition_width: width of transition band (Hz).
+ * \p attenuation_dB out of band attenuation
+ * 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
+ * \p window_type: What kind of window to use. Determines
+ * maximum attenuation and passband ripple.
+ * \p beta: parameter for Kaiser window
+ */
+
+ static std::vector<float>
+ high_pass_2 (double gain,
+ double sampling_freq,
+ double cutoff_freq, // Hz center of transition band
+ double transition_width, // Hz width of transition band
+ double attenuation_dB, // out of band attenuation dB
+ win_type window = WIN_HAMMING,
+ double beta = 6.76); // used only with Kaiser
+
+
/*!
* \brief use "window method" to design a band-pass FIR filter
*
* maximum attenuation and passband ripple.
* \p beta: parameter for Kaiser window
*/
+
static std::vector<float>
band_pass (double gain,
double sampling_freq,
) throw(std::out_of_range);
+ /*!
+ * \brief use "window method" to design a band-pass FIR filter
+ *
+ * \p gain: overall gain of filter (typically 1.0)
+ * \p sampling_freq: sampling freq (Hz)
+ * \p low_cutoff_freq: center of transition band (Hz)
+ * \p high_cutoff_freq: center of transition band (Hz)
+ * \p transition_width: width of transition band (Hz).
+ * \p attenuation_dB out of band attenuation
+ * 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
+ * \p window_type: What kind of window to use. Determines
+ * maximum attenuation and passband ripple.
+ * \p beta: parameter for Kaiser window
+ */
+
+ static std::vector<float>
+ band_pass_2 (double gain,
+ double sampling_freq,
+ double low_cutoff_freq, // Hz beginning transition band
+ double high_cutoff_freq, // Hz beginning transition band
+ double transition_width, // Hz width of transition band
+ double attenuation_dB, // out of band attenuation dB
+ win_type window = WIN_HAMMING,
+ double beta = 6.76); // used only with Kaiser
+
/*!
* \brief use "window method" to design a band-reject FIR filter
*
) throw(std::out_of_range);
+ /*!
+ * \brief use "window method" to design a complex band-pass FIR filter
+ *
+ * \p gain: overall gain of filter (typically 1.0)
+ * \p sampling_freq: sampling freq (Hz)
+ * \p low_cutoff_freq: center of transition band (Hz)
+ * \p high_cutoff_freq: center of transition band (Hz)
+ * \p transition_width: width of transition band (Hz).
+ * \p attenuation_dB out of band attenuation
+ * 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
+ * \p window_type: What kind of window to use. Determines
+ * maximum attenuation and passband ripple.
+ * \p beta: parameter for Kaiser window
+ */
+
+ static std::vector<gr_complex>
+ complex_band_pass_2 (double gain,
+ double sampling_freq,
+ double low_cutoff_freq, // Hz beginning transition band
+ double high_cutoff_freq, // Hz beginning transition band
+ double transition_width, // Hz width of transition band
+ double attenuation_dB, // out of band attenuation dB
+ win_type window = WIN_HAMMING,
+ double beta = 6.76); // used only with Kaiser
+
/*!
* \brief use "window method" to design a band-reject FIR filter
*
double beta = 6.76
) throw(std::out_of_range);
+
+ /*!
+ * \brief use "window method" to design a band-reject FIR filter
+ *
+ * \p gain: overall gain of filter (typically 1.0)
+ * \p sampling_freq: sampling freq (Hz)
+ * \p low_cutoff_freq: center of transition band (Hz)
+ * \p high_cutoff_freq: center of transition band (Hz)
+ * \p transition_width: width of transition band (Hz).
+ * \p attenuation_dB out of band attenuation
+ * 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
+ * \p window_type: What kind of window to use. Determines
+ * maximum attenuation and passband ripple.
+ * \p beta: parameter for Kaiser window
+ */
+
+ static std::vector<float>
+ band_reject_2 (double gain,
+ double sampling_freq,
+ double low_cutoff_freq, // Hz beginning transition band
+ double high_cutoff_freq, // Hz beginning transition band
+ double transition_width, // Hz width of transition band
+ double attenuation_dB, // out of band attenuation dB
+ win_type window = WIN_HAMMING,
+ double beta = 6.76); // used only with Kaiser
+
/*!\brief design a Hilbert Transform Filter
*
* \p ntaps: Number of taps, must be odd
projects / debian / gnuradio / blobdiff