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Uladzimir Karpenka
2026-06-01 15:58:45 +03:00
commit 89c8a0e2b5
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doublepole.h
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/* doublepole.h
This file is part of a program that implements a Software-Defined Radio.
Copyright (C) 2025 Warren Pratt, NR0V
This program 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 2
of the License, or (at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
The author can be reached by email at
warren@pratt.one
*/
/********************************************************************************************************
* *
* Partitioned Overlap-Save Double Pole Filter *
* *
********************************************************************************************************/
#ifndef _doublepole_h
#define _doublepole_h
#include "firmin.h"
typedef struct _doublepole
{
int run; // 0 - filter is OFF; 1 - filter is ON
int position; // position in sequence in which to execute the filter
int size; // input/output buffer size
int nc; // number of impulse response coefficients
double* in; // pointer to input buffer
double* out; // pointer to output buffer
double f_center; // filter center frequency (Hz)
double bandwidth; // filter bandwidth (Hz)
double samplerate; // sample_rate (samples/sec)
double gain; // gain to be applied to filter output
double scale; // internal filter scale factor based upon gain
int mode; // Mode to get output: 0 => CWL; 1 => CWU; 2 => CWL + CWU
FIRCORE p;
} doublepole, *DOUBLEPOLE;
extern DOUBLEPOLE create_doublepole (int run, int position, int size, double* in, double* out,
double f_center, double bandwidth, int samplerate, double gain, int mode);
extern void destroy_doublepole (DOUBLEPOLE a);
extern void flush_doublepole (DOUBLEPOLE a);
extern void xdoublepole (DOUBLEPOLE a, int pos);
extern void setBuffers_doublepole (DOUBLEPOLE a, double* in, double* out);
extern void setSamplerate_doublepole (DOUBLEPOLE a, int rate);
extern void setSize_doublepole (DOUBLEPOLE a, int size);
extern void setGain_doublepole (DOUBLEPOLE a, double gain);
extern void CalcDoublepoleFilter (DOUBLEPOLE a, double f_center, double bandwidth, double gain);
extern __declspec (dllexport) void SetRXADoublepoleRun (int channel, int run);
extern __declspec (dllexport) void SetRXADoublepoleFreqs (int channel, double f_center, double bandwidth);
extern __declspec (dllexport) void SetRXADoublepoleGain (int channel, double gain);
#endif