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- #ifndef _NUMfilter_h_
- #define _NUMfilter_h_
- /* NUMfilter.h
- *
- * Copyright (C) 1992-2018 Paul Boersma
- *
- * This code 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 code 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 work. If not, see <http://www.gnu.org/licenses/>.
- */
- void NUMfbtoa (double formant, double bandwidth, double dt, double *a1, double *a2);
- void NUMfilterSecondOrderSection_a (double x [], integer n, double a1, double a2);
- void NUMfilterSecondOrderSection_fb (double x [], integer n, double dt, double formant, double bandwidth);
- double NUMftopreemphasis (double f, double dt);
- void NUMpreemphasize_a (double x [], integer n, double preemphasis);
- void NUMdeemphasize_a (double x [], integer n, double preemphasis);
- void NUMpreemphasize_f (double x [], integer n, double dt, double frequency);
- void NUMdeemphasize_f (double x [], integer n, double dt, double frequency);
- /* End of file NUMfilter.h */
- #endif
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