Main Page | Class List | File List | Class Members | File Members

filters.h

Go to the documentation of this file.
00001 /* Copyright (C) 2002 Jean-Marc Valin 00002 File: filters.h 00003 Various analysis/synthesis filters 00004 00005 Redistribution and use in source and binary forms, with or without 00006 modification, are permitted provided that the following conditions 00007 are met: 00008 00009 - Redistributions of source code must retain the above copyright 00010 notice, this list of conditions and the following disclaimer. 00011 00012 - Redistributions in binary form must reproduce the above copyright 00013 notice, this list of conditions and the following disclaimer in the 00014 documentation and/or other materials provided with the distribution. 00015 00016 - Neither the name of the Xiph.org Foundation nor the names of its 00017 contributors may be used to endorse or promote products derived from 00018 this software without specific prior written permission. 00019 00020 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 00021 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 00022 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 00023 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR 00024 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 00025 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 00026 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 00027 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 00028 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 00029 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 00030 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 00031 */ 00032 00033 #ifndef FILTERS_H 00034 #define FILTERS_H 00035 00036 #include "misc.h" 00037 00038 spx_word16_t compute_rms(const spx_sig_t *x, int len); 00039 void signal_mul(const spx_sig_t *x, spx_sig_t *y, spx_word32_t scale, int len); 00040 void signal_div(const spx_sig_t *x, spx_sig_t *y, spx_word32_t scale, int len); 00041 00042 #ifdef FIXED_POINT 00043 00044 int normalize16(const spx_sig_t *x, spx_word16_t *y, int max_scale, int len); 00045 00046 #endif 00047 00048 typedef struct CombFilterMem { 00049 int last_pitch; 00050 spx_word16_t last_pitch_gain[3]; 00051 spx_word16_t smooth_gain; 00052 } CombFilterMem; 00053 00054 00055 void qmf_decomp(const spx_word16_t *xx, const spx_word16_t *aa, spx_sig_t *y1, spx_sig_t *y2, int N, int M, spx_word16_t *mem, char *stack); 00056 void fir_mem_up(const spx_sig_t *x, const spx_word16_t *a, spx_sig_t *y, int N, int M, spx_word32_t *mem, char *stack); 00057 00058 00059 void filter_mem2(const spx_sig_t *x, const spx_coef_t *num, const spx_coef_t *den, spx_sig_t *y, int N, int ord, spx_mem_t *mem); 00060 void fir_mem2(const spx_sig_t *x, const spx_coef_t *num, spx_sig_t *y, int N, int ord, spx_mem_t *mem); 00061 void iir_mem2(const spx_sig_t *x, const spx_coef_t *den, spx_sig_t *y, int N, int ord, spx_mem_t *mem); 00062 00063 /* Apply bandwidth expansion on LPC coef */ 00064 void bw_lpc(spx_word16_t gamma, const spx_coef_t *lpc_in, spx_coef_t *lpc_out, int order); 00065 00066 00067 00068 void syn_percep_zero(const spx_sig_t *x, const spx_coef_t *ak, const spx_coef_t *awk1, const spx_coef_t *awk2, spx_sig_t *y, int N, int ord, char *stack); 00069 00070 void residue_percep_zero(const spx_sig_t *xx, const spx_coef_t *ak, const spx_coef_t *awk1, const spx_coef_t *awk2, spx_sig_t *y, int N, int ord, char *stack); 00071 00072 void comb_filter_mem_init (CombFilterMem *mem); 00073 00074 void comb_filter( 00075 spx_sig_t *exc, /*decoded excitation*/ 00076 spx_sig_t *new_exc, /*enhanced excitation*/ 00077 spx_coef_t *ak, /*LPC filter coefs*/ 00078 int p, /*LPC order*/ 00079 int nsf, /*sub-frame size*/ 00080 int pitch, /*pitch period*/ 00081 spx_word16_t *pitch_gain, /*pitch gain (3-tap)*/ 00082 spx_word16_t comb_gain, /*gain of comb filter*/ 00083 CombFilterMem *mem 00084 ); 00085 00086 00087 #endif

Generated on Thu Aug 12 11:55:01 2004 for speex by doxygen 1.3.8