1*a58d3d2aSXin Li /* Copyright (c) 2017-2018 Mozilla */ 2*a58d3d2aSXin Li /* 3*a58d3d2aSXin Li Redistribution and use in source and binary forms, with or without 4*a58d3d2aSXin Li modification, are permitted provided that the following conditions 5*a58d3d2aSXin Li are met: 6*a58d3d2aSXin Li 7*a58d3d2aSXin Li - Redistributions of source code must retain the above copyright 8*a58d3d2aSXin Li notice, this list of conditions and the following disclaimer. 9*a58d3d2aSXin Li 10*a58d3d2aSXin Li - Redistributions in binary form must reproduce the above copyright 11*a58d3d2aSXin Li notice, this list of conditions and the following disclaimer in the 12*a58d3d2aSXin Li documentation and/or other materials provided with the distribution. 13*a58d3d2aSXin Li 14*a58d3d2aSXin Li THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 15*a58d3d2aSXin Li ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 16*a58d3d2aSXin Li LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 17*a58d3d2aSXin Li A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR 18*a58d3d2aSXin Li CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19*a58d3d2aSXin Li EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20*a58d3d2aSXin Li PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21*a58d3d2aSXin Li PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 22*a58d3d2aSXin Li LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 23*a58d3d2aSXin Li NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 24*a58d3d2aSXin Li SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25*a58d3d2aSXin Li */ 26*a58d3d2aSXin Li 27*a58d3d2aSXin Li #ifndef FREQ_H 28*a58d3d2aSXin Li #define FREQ_H 29*a58d3d2aSXin Li 30*a58d3d2aSXin Li #include "kiss_fft.h" 31*a58d3d2aSXin Li 32*a58d3d2aSXin Li #define LPC_ORDER 16 33*a58d3d2aSXin Li 34*a58d3d2aSXin Li #define PREEMPHASIS (0.85f) 35*a58d3d2aSXin Li 36*a58d3d2aSXin Li #define FRAME_SIZE_5MS (2) 37*a58d3d2aSXin Li #define OVERLAP_SIZE_5MS (2) 38*a58d3d2aSXin Li #define TRAINING_OFFSET_5MS (1) 39*a58d3d2aSXin Li 40*a58d3d2aSXin Li #define WINDOW_SIZE_5MS (FRAME_SIZE_5MS + OVERLAP_SIZE_5MS) 41*a58d3d2aSXin Li 42*a58d3d2aSXin Li #define FRAME_SIZE (80*FRAME_SIZE_5MS) 43*a58d3d2aSXin Li #define OVERLAP_SIZE (80*OVERLAP_SIZE_5MS) 44*a58d3d2aSXin Li #define TRAINING_OFFSET (80*TRAINING_OFFSET_5MS) 45*a58d3d2aSXin Li #define WINDOW_SIZE (FRAME_SIZE + OVERLAP_SIZE) 46*a58d3d2aSXin Li #define FREQ_SIZE (WINDOW_SIZE/2 + 1) 47*a58d3d2aSXin Li 48*a58d3d2aSXin Li #define NB_BANDS 18 49*a58d3d2aSXin Li #define NB_BANDS_1 (NB_BANDS - 1) 50*a58d3d2aSXin Li 51*a58d3d2aSXin Li void lpcn_compute_band_energy(float *bandE, const kiss_fft_cpx *X); 52*a58d3d2aSXin Li void burg_cepstral_analysis(float *ceps, const float *x); 53*a58d3d2aSXin Li 54*a58d3d2aSXin Li void apply_window(float *x); 55*a58d3d2aSXin Li void dct(float *out, const float *in); 56*a58d3d2aSXin Li void forward_transform(kiss_fft_cpx *out, const float *in); 57*a58d3d2aSXin Li float lpc_from_cepstrum(float *lpc, const float *cepstrum); 58*a58d3d2aSXin Li void apply_window(float *x); 59*a58d3d2aSXin Li void lpc_weighting(float *lpc, float gamma); 60*a58d3d2aSXin Li 61*a58d3d2aSXin Li #endif 62