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79 lines
3.1 KiB
C++
79 lines
3.1 KiB
C++
/* firmin.h
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2016 Warren Pratt, NR0V
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Copyright (C) 2024 Edouard Griffiths, F4EXB Adapted to SDRangel
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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The author can be reached by email at
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warren@wpratt.com
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*/
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/********************************************************************************************************
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* *
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* Time-Domain FIR *
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* *
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********************************************************************************************************/
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#ifndef wdsp_firmin_h
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#define wdsp_firmin_h
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#include "fftw3.h"
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#include "export.h"
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namespace WDSP {
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class WDSP_API FIRMIN
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{
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public:
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int run; // run control
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int position; // position at which to execute
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int size; // input/output buffer size, power of two
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float* in; // input buffer
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float* out; // output buffer, can be same as input
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int nc; // number of filter coefficients, power of two
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float f_low; // low cutoff frequency
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float f_high; // high cutoff frequency
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float* ring; // internal complex ring buffer
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float* h; // complex filter coefficients
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int rsize; // ring size, number of complex samples, power of two
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int mask; // mask to update indexes
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int idx; // ring input/output index
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float samplerate; // sample rate
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int wintype; // filter window type
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float gain; // filter gain
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static FIRMIN* create_firmin (int run, int position, int size, float* in, float* out,
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int nc, float f_low, float f_high, int samplerate, int wintype, float gain);
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static void destroy_firmin (FIRMIN *a);
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static void flush_firmin (FIRMIN *a);
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static void xfirmin (FIRMIN *a, int pos);
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static void setBuffers_firmin (FIRMIN *a, float* in, float* out);
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static void setSamplerate_firmin (FIRMIN *a, int rate);
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static void setSize_firmin (FIRMIN *a, int size);
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static void setFreqs_firmin (FIRMIN *a, float f_low, float f_high);
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private:
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static void calc_firmin (FIRMIN *a);
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};
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} // namespace WDSP
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#endif
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