83 lines
3.2 KiB
C
83 lines
3.2 KiB
C
/* gaussian.h
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This file is part of a program that implements a Software-Defined Radio.
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Copyright (C) 2025-2026 Warren Pratt, NR0V
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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@pratt.one
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*/
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/********************************************************************************************************
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* *
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* Partitioned Overlap-Save Gaussian *
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* *
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********************************************************************************************************/
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#ifndef _gaussian_h
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#define _gaussian_h
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#include "firmin.h"
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typedef struct _gaussian
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{
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int run; // 0 - filter is OFF; 1 - filter is ON
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int position; // position in sequence in which to execute the filter
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int size; // input/output buffer size
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int nc; // number of filter coefficients; if set to '0', will be automatically calculated
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int nc_default; // value to which 'nc' was last set at instantiation or by a call to set 'nc'
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double* in; // pointer to input buffer
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double* out; // pointer to output buffer
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double f_center; // filter center frequency (Hz)
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double bandwidth; // filter bandwidth (Hz)
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double samplerate; // sample_rate (samples/sec)
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double gain; // gain to be applied to filter output
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double scale; // internal filter scale factor based upon gain
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double nsigma; // number of 'sigma' on each side of center to extend the Gaussian curve
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int mode; // Mode to get output: 0 => CWL; 1 => CWU; 2 => CWL + CWU
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FIRCORE p; // pointer to partititioned overlap-save filter
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}gaussian, *GAUSSIAN;
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extern GAUSSIAN create_gaussian(int run, int position, int size, int nc, double* in, double* out,
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double f_center, double bandwidth, int samplerate, double gain, double nsigma, int mode);
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extern void destroy_gaussian(GAUSSIAN a);
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extern void flush_gaussian(GAUSSIAN a);
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extern void xgaussian(GAUSSIAN a, int pos);
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extern void setBuffers_gaussian(GAUSSIAN a, double* in, double* out);
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extern void setSamplerate_gaussian(GAUSSIAN a, int rate);
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extern void setSize_gaussian(GAUSSIAN a, int size);
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extern void setGain_gaussian(GAUSSIAN a, double gain);
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extern void CalcGaussianFilter(GAUSSIAN a, double f_center, double bandwidth, double gain);
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extern __declspec (dllexport) void SetRXAGaussianRun(int channel, int run);
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extern __declspec (dllexport) void SetRXAGaussianFreqs(int channel, double f_center, double bandwidth);
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extern __declspec (dllexport) void SetRXAGaussianGain(int channel, double gain);
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extern __declspec (dllexport) void SetRXAGaussianNC(int channel, int nc);
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#endif
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