www.pudn.com > speakFreely-code.zip > acelp_pf.h

/*======================================================================*/ 
/*     Enhanced Variable Rate Codec - Bit-Exact C Specification         */ 
/*     Copyright (C) 1997-1998 Telecommunications Industry Association. */ 
/*     All rights reserved.                                             */ 
/*----------------------------------------------------------------------*/ 
/* Note:  Reproduction and use of this software for the design and      */ 
/*     development of North American Wideband CDMA Digital              */ 
/*     Cellular Telephony Standards is authorized by the TIA.           */ 
/*     The TIA does not authorize the use of this software for any      */ 
/*     other purpose.                                                   */ 
/*                                                                      */ 
/*     The availability of this software does not provide any license   */ 
/*     by implication, estoppel, or otherwise under any patent rights   */ 
/*     of TIA member companies or others covering any use of the        */ 
/*     contents herein.                                                 */ 
/*                                                                      */ 
/*     Any copies of this software or derivative works must include     */ 
/*     this and all other proprietary notices.                          */ 
/*======================================================================*/ 
#include "typedefs.h" 
 
void ACELP_Code( 
  Shortword _xn[],        /* (i)     :Target signal for codebook.       */ 
  Shortword _res2[],      /* (i)     :Residual after pitch contribution */ 
  Shortword _h1[],        /* (i)     :Impulse response of filters.      */ 
  Shortword   T0,           /* (i)     :Pitch lag.                        */ 
  Shortword _pitch_gain,  /* (i)     :Pitch gain.                       */ 
  Shortword   l_subfr,      /* (i)     :Subframe lenght.                  */ 
  Shortword _code[],      /* (o)     :Innovative vector.                */ 
  Shortword *_gain_code,  /* (o)     :Innovative vector gain.           */ 
  Shortword _y2[],        /* (o)     :Filtered innovative vector.       */ 
  Shortword  *index,        /* (o)     :Index of codebook + signs         */ 
  Shortword  choice         /* (i)     :Choice of innovative codebook     */ 
              /*          0 -> 10 bits                      */ 
              /*          1 -> 35 bits                      */ 
); 
 
void code_3i54_10bits( 
  Shortword dn[],    /* (i) Q0 : dn[54] correlation between target and h[]     */ 
  Shortword l_subfr, /* (i)    : lenght of subframe (53 or 54)                 */ 
  Shortword H[],     /* (i) Q12: impulse response of weighted synthesis filter */ 
  Shortword code[],  /* (o) Q12: algebraic (fixed) codebook excitation         */ 
  Shortword y[],     /* (o) Q10: filtered fixed codebook excitation            */ 
  Shortword *indx    /* (o)    : index 1 words of 10 bits                      */ 
); 
 
void code_8i55_35bits( 
  Shortword dn[],    /* (i) Q0 : dn[55] correlation between target and h[]     */ 
  Shortword cn[],    /* (i) Q0 : cn[55] residual after long term prediction    */ 
  Shortword l_subfr, /* (i)    : lenght of subframe (53 or 54)                 */ 
  Shortword H[],     /* (i) Q12: impulse response of weighted synthesis filter */ 
  Shortword code[],  /* (o) Q12: algebraic (fixed) codebook excitation         */ 
  Shortword y[],     /* (o) Q10: filtered fixed codebook excitation            */ 
  Shortword indx[]   /* (o)    : index 4 words: 8 + 8 + 8 + 11 = 35 bits       */ 
); 
 
void dec3_10( 
  Shortword index,   /* (i)    : indx of 3 pulses (10 bits)               */ 
  Shortword cod[],   /* (o) Q12: algebraic (fixed) codebook excitation    */ 
  Shortword l_subfr  /* (i)    : lenght of subframe (53 or 54)            */ 
); 
 
void dec8_35( 
  Shortword *indx,   /* (i)    : indx of 8 pulses (8+8+8+11 = 35 bits)    */ 
  Shortword cod[],   /* (o) Q12: algebraic (fixed) codebook excitation    */ 
  Shortword l_subfr  /* (i)    : lenght of subframe (53 or 54)            */ 
); 
 
void cor_h_x( 
  Shortword h[],    /* (i) Q12 : impulse response of weighted synthesis filter */ 
  Shortword x[],    /* (i) Q0  : correlation between target and h[]            */ 
  Shortword dn[]    /* (o) Q0  : correlation between target and h[]            */ 
); 
 
Shortword G_code(     /* out   Q0 : Gain of innovation code.        */ 
  Shortword xn2[],    /* in    Q0 : target vector                   */ 
  Shortword y2[],     /* in    Q10: filtered inovation vector       */ 
  Shortword l_subfr   /* in       : length of subframe (53 or 54)   */  
);