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49 lines
1.8 KiB
C
49 lines
1.8 KiB
C
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/*
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Copyright (C) 2018 James C. Ahlstrom
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All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License version 2.1, as
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published by the Free Software Foundation. This program is
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distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __FILTER__
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#define __FILTER__
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#include <complex>
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namespace FreeDV
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{
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struct quisk_cfFilter { // Structure to hold the static data for FIR filters
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float * dCoefs; // real filter coefficients
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std::complex<float> * cpxCoefs; // complex filter coefficients
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int nBuf; // dimension of cBuf
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int nTaps; // dimension of dSamples, cSamples, dCoefs
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int decim_index; // index of next sample for decimation
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std::complex<float> * cSamples; // storage for old samples
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std::complex<float> * ptcSamp; // next available position in cSamples
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std::complex<float> * cBuf; // auxillary buffer for interpolation
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} ;
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extern int quisk_cfInterpDecim(std::complex<float> *, int, struct quisk_cfFilter *, int, int);
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extern void quisk_filt_cfInit(struct quisk_cfFilter *, float *, int);
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extern void quisk_filt_destroy(struct quisk_cfFilter *);
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extern void quisk_cfTune(struct quisk_cfFilter *, float);
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extern void quisk_ccfFilter(std::complex<float> *, std::complex<float> *, int, struct quisk_cfFilter *);
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extern float quiskFilt120t480[480];
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extern float filtP550S750[160];
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} // FreeDV
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#endif
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