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DuerOS-Light-SDK-v1.1.0/duer-os-light/external/speex/libspeex/filters.h@47:9e361da97763, 2017-07-18 (annotated)

Committer:
TMBOY
Date:
Tue Jul 18 16:54:45 2017 +0800
Revision:
47:9e361da97763
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TMBOY 47:9e361da97763 1 /* Copyright (C) 2002 Jean-Marc Valin */
TMBOY 47:9e361da97763 2 /**
TMBOY 47:9e361da97763 3 @file filters.h
TMBOY 47:9e361da97763 4 @brief Various analysis/synthesis filters
TMBOY 47:9e361da97763 5 */
TMBOY 47:9e361da97763 6 /*
TMBOY 47:9e361da97763 7 Redistribution and use in source and binary forms, with or without
TMBOY 47:9e361da97763 8 modification, are permitted provided that the following conditions
TMBOY 47:9e361da97763 9 are met:
TMBOY 47:9e361da97763 10
TMBOY 47:9e361da97763 11 - Redistributions of source code must retain the above copyright
TMBOY 47:9e361da97763 12 notice, this list of conditions and the following disclaimer.
TMBOY 47:9e361da97763 13
TMBOY 47:9e361da97763 14 - Redistributions in binary form must reproduce the above copyright
TMBOY 47:9e361da97763 15 notice, this list of conditions and the following disclaimer in the
TMBOY 47:9e361da97763 16 documentation and/or other materials provided with the distribution.
TMBOY 47:9e361da97763 17
TMBOY 47:9e361da97763 18 - Neither the name of the Xiph.org Foundation nor the names of its
TMBOY 47:9e361da97763 19 contributors may be used to endorse or promote products derived from
TMBOY 47:9e361da97763 20 this software without specific prior written permission.
TMBOY 47:9e361da97763 21
TMBOY 47:9e361da97763 22 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
TMBOY 47:9e361da97763 23 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
TMBOY 47:9e361da97763 24 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
TMBOY 47:9e361da97763 25 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
TMBOY 47:9e361da97763 26 CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
TMBOY 47:9e361da97763 27 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
TMBOY 47:9e361da97763 28 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
TMBOY 47:9e361da97763 29 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
TMBOY 47:9e361da97763 30 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
TMBOY 47:9e361da97763 31 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
TMBOY 47:9e361da97763 32 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
TMBOY 47:9e361da97763 33 */
TMBOY 47:9e361da97763 34
TMBOY 47:9e361da97763 35 #ifndef FILTERS_H
TMBOY 47:9e361da97763 36 #define FILTERS_H
TMBOY 47:9e361da97763 37
TMBOY 47:9e361da97763 38 #include "misc.h"
TMBOY 47:9e361da97763 39
TMBOY 47:9e361da97763 40 spx_word16_t compute_rms(const spx_sig_t *x, int len);
TMBOY 47:9e361da97763 41 spx_word16_t compute_rms16(const spx_word16_t *x, int len);
TMBOY 47:9e361da97763 42 void signal_mul(const spx_sig_t *x, spx_sig_t *y, spx_word32_t scale, int len);
TMBOY 47:9e361da97763 43 void signal_div(const spx_word16_t *x, spx_word16_t *y, spx_word32_t scale, int len);
TMBOY 47:9e361da97763 44
TMBOY 47:9e361da97763 45 #ifdef FIXED_POINT
TMBOY 47:9e361da97763 46
TMBOY 47:9e361da97763 47 int normalize16(const spx_sig_t *x, spx_word16_t *y, spx_sig_t max_scale, int len);
TMBOY 47:9e361da97763 48
TMBOY 47:9e361da97763 49 #endif
TMBOY 47:9e361da97763 50
TMBOY 47:9e361da97763 51
TMBOY 47:9e361da97763 52 #define HIGHPASS_NARROWBAND 0
TMBOY 47:9e361da97763 53 #define HIGHPASS_WIDEBAND 2
TMBOY 47:9e361da97763 54 #define HIGHPASS_INPUT 0
TMBOY 47:9e361da97763 55 #define HIGHPASS_OUTPUT 1
TMBOY 47:9e361da97763 56 #define HIGHPASS_IRS 4
TMBOY 47:9e361da97763 57
TMBOY 47:9e361da97763 58 void highpass(const spx_word16_t *x, spx_word16_t *y, int len, int filtID, spx_mem_t *mem);
TMBOY 47:9e361da97763 59
TMBOY 47:9e361da97763 60
TMBOY 47:9e361da97763 61 void qmf_decomp(const spx_word16_t *xx, const spx_word16_t *aa, spx_word16_t *, spx_word16_t *y2, int N, int M, spx_word16_t *mem, char *stack);
TMBOY 47:9e361da97763 62 void qmf_synth(const spx_word16_t *x1, const spx_word16_t *x2, const spx_word16_t *a, spx_word16_t *y, int N, int M, spx_word32_t *mem1, spx_word32_t *mem2, char *stack);
TMBOY 47:9e361da97763 63
TMBOY 47:9e361da97763 64 void filter_mem16(const spx_word16_t *x, const spx_coef_t *num, const spx_coef_t *den, spx_word16_t *y, int N, int ord, spx_mem_t *mem, char *stack);
TMBOY 47:9e361da97763 65 void iir_mem16(const spx_word16_t *x, const spx_coef_t *den, spx_word16_t *y, int N, int ord, spx_mem_t *mem, char *stack);
TMBOY 47:9e361da97763 66 void fir_mem16(const spx_word16_t *x, const spx_coef_t *num, spx_word16_t *y, int N, int ord, spx_mem_t *mem, char *stack);
TMBOY 47:9e361da97763 67
TMBOY 47:9e361da97763 68 /* Apply bandwidth expansion on LPC coef */
TMBOY 47:9e361da97763 69 void bw_lpc(spx_word16_t , const spx_coef_t *lpc_in, spx_coef_t *lpc_out, int order);
TMBOY 47:9e361da97763 70 void sanitize_values32(spx_word32_t *vec, spx_word32_t min_val, spx_word32_t max_val, int len);
TMBOY 47:9e361da97763 71
TMBOY 47:9e361da97763 72
TMBOY 47:9e361da97763 73 void syn_percep_zero16(const spx_word16_t *xx, const spx_coef_t *ak, const spx_coef_t *awk1, const spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *stack);
TMBOY 47:9e361da97763 74 void residue_percep_zero16(const spx_word16_t *xx, const spx_coef_t *ak, const spx_coef_t *awk1, const spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *stack);
TMBOY 47:9e361da97763 75
TMBOY 47:9e361da97763 76 void compute_impulse_response(const spx_coef_t *ak, const spx_coef_t *awk1, const spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *stack);
TMBOY 47:9e361da97763 77
TMBOY 47:9e361da97763 78 void multicomb(
TMBOY 47:9e361da97763 79 spx_word16_t *exc, /*decoded excitation*/
TMBOY 47:9e361da97763 80 spx_word16_t *new_exc, /*enhanced excitation*/
TMBOY 47:9e361da97763 81 spx_coef_t *ak, /*LPC filter coefs*/
TMBOY 47:9e361da97763 82 int p, /*LPC order*/
TMBOY 47:9e361da97763 83 int nsf, /*sub-frame size*/
TMBOY 47:9e361da97763 84 int pitch, /*pitch period*/
TMBOY 47:9e361da97763 85 int max_pitch, /*pitch gain (3-tap)*/
TMBOY 47:9e361da97763 86 spx_word16_t comb_gain, /*gain of comb filter*/
TMBOY 47:9e361da97763 87 char *stack
TMBOY 47:9e361da97763 88 );
TMBOY 47:9e361da97763 89
TMBOY 47:9e361da97763 90 #endif