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C++ L_mult函数代码示例

原作者: [db:作者] 来自: [db:来源] 收藏 邀请

本文整理汇总了C++中L_mult函数的典型用法代码示例。如果您正苦于以下问题:C++ L_mult函数的具体用法?C++ L_mult怎么用?C++ L_mult使用的例子?那么恭喜您, 这里精选的函数代码示例或许可以为您提供帮助。



在下文中一共展示了L_mult函数的20个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于我们的系统推荐出更棒的C++代码示例。

示例1: WebRtcG729fix_Random

int16_t WebRtcG729fix_Random(int16_t *seed)
{
  /* seed = seed*31821 + 13849; */
  *seed = extract_l(WebRtcSpl_AddSatW32(L_shr(L_mult(*seed, 31821), 1), 13849L));

  return(*seed);
}
开发者ID:sippet,项目名称:g729,代码行数:7,代码来源:util.c


示例2: Lsp_lsf

void Lsp_lsf(
  Word16 lsp[],    /* (i) Q15 : lsp[m] (range: -1<=val<1)                */
  Word16 lsf[],    /* (o) Q15 : lsf[m] normalized (range: 0.0<=val<=0.5) */
  Word16 m         /* (i)     : LPC order                                */
)
{
  Word16 i, ind, tmp;
  Word32 L_tmp;

  ind = 63;    /* begin at end of table -1 */

  for(i= m-(Word16)1; i >= 0; i--)
  {
    /* find value in table that is just greater than lsp[i] */
    while(table[ind] < lsp[i])
    {
      ind = sub(ind,1);
    }

    /* acos(lsp[i])= ind*256 + ( ( lsp[i]-table[ind] ) * slope[ind] )/4096 */

    L_tmp  = L_mult( sub(lsp[i], table[ind]) , slope[ind] );
    tmp = round(L_shl(L_tmp, 3));     /*(lsp[i]-table[ind])*slope[ind])>>12*/
    lsf[i] = add(tmp, shl(ind, 8));
  }
  return;
}
开发者ID:huangjingpei,项目名称:webrtc,代码行数:27,代码来源:lpcfunc.c


示例3: Lsp_prev_extract

/*
  extract elementary LSP from composed LSP with previous LSP
*/
void Lsp_prev_extract(
  Word16 lsp[M],                /* (i) Q13 : unquantized LSP parameters  */
  Word16 lsp_ele[M],            /* (o) Q13 : target vector               */
  Word16 fg[MA_NP][M],          /* (i) Q15 : MA prediction coef.         */
  Word16 freq_prev[MA_NP][M],   /* (i) Q13 : previous LSP vector         */
  Word16 fg_sum_inv[M]          /* (i) Q12 : inverse previous LSP vector */
)
{
  Word16 j, k;
  Word32 L_temp;                /* Q19 */
  Word16 temp;                  /* Q13 */


  for ( j = 0 ; j < M ; j++ ) {
    L_temp = L_deposit_h(lsp[j]);
    for ( k = 0 ; k < MA_NP ; k++ )
      L_temp = L_msu( L_temp, freq_prev[k][j], fg[k][j] );

    temp = extract_h(L_temp);
    L_temp = L_mult( temp, fg_sum_inv[j] );
    lsp_ele[j] = extract_h( L_shl( L_temp, 3 ) );

  }
  return;
}
开发者ID:eager7,项目名称:linux-kernel,代码行数:28,代码来源:lspgetq.c


示例4: filt_plt

/*----------------------------------------------------------------------------
 *  filt_plt -  ltp  postfilter
 *----------------------------------------------------------------------------
 */
static void filt_plt(
    Word16 *s_in,       /* input : input signal with past*/
    Word16 *s_ltp,      /* input : filtered signal with gain 1 */
    Word16 *s_out,      /* output: output signal */
    Word16 gain_plt     /* input : filter gain  */
)
{

    /* Local variables */
    int n;
    Word32 L_acc;
    Word16 gain_plt_1;

    gain_plt_1 = sub(32767, gain_plt);
    gain_plt_1 = add(gain_plt_1, 1);        /* 2**15 (1 - g) */

    for(n=0;  n<L_SUBFR; n++) {
        /* s_out(n) = gain_plt x s_in(n) + gain_plt_1 x s_ltp(n)        */
        L_acc    = L_mult(gain_plt, s_in[n]);
        L_acc    = L_mac(L_acc, gain_plt_1, s_ltp[n]);  /* no overflow      */
        s_out[n] = round(L_acc);
    }

    return;
}
开发者ID:thecc4re,项目名称:lumicall,代码行数:29,代码来源:pst.c


示例5: Lsf_lsp2

void Lsf_lsp2(
  Word16 lsf[],    /* (i) Q13 : lsf[m] (range: 0.0<=val<PI) */
  Word16 lsp[],    /* (o) Q15 : lsp[m] (range: -1<=val<1)   */
  Word16 m         /* (i)     : LPC order                   */
)
{
  Word16 i, ind;
  Word16 offset;   /* in Q8 */
  Word16 freq;     /* normalized frequency in Q15 */
  Word32 L_tmp;

  for(i=0; i<m; i++)
  {
/*    freq = abs_s(freq);*/
    freq = mult(lsf[i], 20861);          /* 20861: 1.0/(2.0*PI) in Q17 */
    ind    = shr(freq, 8);               /* ind    = b8-b15 of freq */
    offset = freq & (Word16)0x00ff;      /* offset = b0-b7  of freq */

    if (ind > 63){
      ind = 63;                 /* 0 <= ind <= 63 */
    }

    /* lsp[i] = table2[ind]+ (slope_cos[ind]*offset >> 12) */

    L_tmp   = L_mult(slope_cos[ind], offset);   /* L_tmp in Q28 */
    lsp[i] = add(table2[ind], extract_l(L_shr(L_tmp, 13)));

  }
  return;
}
开发者ID:huangjingpei,项目名称:webrtc,代码行数:30,代码来源:lpcfunc.c


示例6: Get_lsp_pol

static void Get_lsp_pol(Word16 *lsp, Word32 *f)
{
  Word16 i,j, hi, lo;
  Word32 t0;

   /* All computation in Q24 */

   *f = L_mult(4096, 2048);             /* f[0] = 1.0;             in Q24  */
   f++;
   *f = L_msu((Word32)0, *lsp, 512);    /* f[1] =  -2.0 * lsp[0];  in Q24  */

   f++;
   lsp += 2;                            /* Advance lsp pointer             */

   for(i=2; i<=5; i++)
   {
     *f = f[-2];

     for(j=1; j<i; j++, f--)
     {
       L_Extract(f[-1] ,&hi, &lo);
       t0 = Mpy_32_16(hi, lo, *lsp);         /* t0 = f[-1] * lsp    */
       t0 = L_shl(t0, 1);
       *f = L_add(*f, f[-2]);                /* *f += f[-2]         */
       *f = L_sub(*f, t0);                   /* *f -= t0            */
     }
     *f   = L_msu(*f, *lsp, 512);            /* *f -= lsp<<9        */
     f   += i;                               /* Advance f pointer   */
     lsp += 2;                               /* Advance lsp pointer */
   }

   return;
}
开发者ID:Orange168,项目名称:lumicall_new,代码行数:33,代码来源:lpcfunc.c


示例7: Lsp_lsf2

void Lsp_lsf2(
  Word16 lsp[],    /* (i) Q15 : lsp[m] (range: -1<=val<1)   */
  Word16 lsf[],    /* (o) Q13 : lsf[m] (range: 0.0<=val<PI) */
  Word16 m         /* (i)     : LPC order                   */
)
{
  Word16 i, ind;
  Word16 offset;   /* in Q15 */
  Word16 freq;     /* normalized frequency in Q16 */
  Word32 L_tmp;

  ind = 63;           /* begin at end of table2 -1 */

  for(i= m-(Word16)1; i >= 0; i--)
  {
    /* find value in table2 that is just greater than lsp[i] */
    while( sub(table2[ind], lsp[i]) < 0 )
    {
      ind = sub(ind,1);
      if ( ind <= 0 )
        break;
    }

    offset = sub(lsp[i], table2[ind]);

    /* acos(lsp[i])= ind*512 + (slope_acos[ind]*offset >> 11) */

    L_tmp  = L_mult( slope_acos[ind], offset );   /* L_tmp in Q28 */
    freq = add(shl(ind, 9), extract_l(L_shr(L_tmp, 12)));
    lsf[i] = mult(freq, 25736);           /* 25736: 2.0*PI in Q12 */

  }
  return;
}
开发者ID:Orange168,项目名称:lumicall_new,代码行数:34,代码来源:lpcfunc.c


示例8: build_CN_code

/***************************************************************************
*
*  Function    : build_CN_code
*
***************************************************************************/ 
void build_CN_code (
    Word32 *seed,         /* i/o : Old CN generator shift register state */
    Word16 cod[]          /* o   : Generated CN fixed codebook vector    */
)
{
   Word16 i, j, k;
   
   for (i = 0; i < L_SUBFR; i++)
   {
      cod[i] = 0;                         
   }
   
   for (k = 0; k < NB_PULSE10; k++)
   {
      i = pseudonoise (seed, 2);      /* generate pulse position */
      i = shr (extract_l (L_mult (i, 10)), 1);
      i = i + k;
      
      j = pseudonoise (seed, 1);      /* generate sign           */

         
      if (j > 0)
      {
         cod[i] = 4096;                                 
      }
      else
      {
         cod[i] = -4096;                                      
      }
   }
   
   return;
}
开发者ID:NearZhxiAo,项目名称:3730,代码行数:38,代码来源:build_cn_code.c


示例9: Random

Word16 Random(Word16 *seed)
{

  /* seed = seed*31821 + 13849; */
  *seed = extract_l(L_add(L_shr(L_mult(*seed, 31821), 1), 13849L));

  return(*seed);
}
开发者ID:Orange168,项目名称:lumicall_new,代码行数:8,代码来源:util.c


示例10: Mpy_32_16

Word32 Mpy_32_16(Word16 hi, Word16 lo, Word16 n)
{
  Word32 L_32;

  L_32 = L_mult(hi, n);
  L_32 = L_mac(L_32, mult(lo, n) , 1);

  return( L_32 );
}
开发者ID:2831942318,项目名称:siphon,代码行数:9,代码来源:oper_32b.c


示例11: set_sign

/*-------------------------------------------------------------------*
* Function  set_sign()                                              *
* ~~~~~~~~~~~~~~~~~~~~                                              *
* Set the sign of each pulse position.                              *
*-------------------------------------------------------------------*/
static void set_sign(
  Word16 fac_cn,     /* (i) Q15: residual weight for sign determination */
  Word16 cn[],       /* (i) Q0 : residual after long term prediction    */
  Word16 dn[],       /* (i) Q0 : correlation between target and h[]     */
  Word16 sign[],     /* (o) Q15: sign vector (sign of each position)    */
  Word16 inv_sign[], /* (o) Q15: inverse of sign[]                      */
  Word16 pos_max[],  /* (o)    : pos of max of correlation              */
  Word32 corr[]      /* (o)    : correlation of each track              */
)
{
    Word16 i, k, pos, k_cn, k_dn, val;
    Word32 s, max;

    /* calculate energy for normalization of cn[] and dn[] */
    s = 0;
    for (i=0; i<L_SUBFR; i++) s = L_mac(s, cn[i], cn[i]);
    if (s < 512) s = 512;
    s = Inv_sqrt(s);
    k_cn = extract_h(L_shl(s, 5));     /* k_cn = 11..23170 */
    k_cn = mult(k_cn, fac_cn);

    s = 0;
    for (i=0; i<L_SUBFR; i++) s = L_mac(s, dn[i], dn[i]);
    if (s < 512) s = 512;
    s = Inv_sqrt(s);
    k_dn = extract_h(L_shl(s, 5));     /* k_dn = 11..23170 */

    /* set sign according to en[] = k_cn*cn[] + k_dn*dn[]    */

    /* find position of maximum of correlation in each track */
    for (k=0; k<NB_TRACK; k++) {
        max = -1;
        for (i=k; i<L_SUBFR; i+=STEP) {
            val = dn[i];
            s = L_mac(L_mult(k_cn, cn[i]), k_dn, val);
            if (s >= 0) {
                sign[i] = 32767L;         /* sign = +1 (Q15) */
                inv_sign[i] = -32768L;
            }
            else {
                sign[i] = -32768L;        /* sign = -1 (Q15) */
                inv_sign[i] = 32767L;
                val = negate(val);
            }
            dn[i] = val;      /* modify dn[] according to the fixed sign */
            s = L_abs(s);
            if (s > max) {
                max = s;
                pos = i;
            }
        }
        pos_max[k] = pos;
        corr[k] = max;
    }

    return;
}
开发者ID:SibghatullahSheikh,项目名称:codecs,代码行数:62,代码来源:acelp_e.c


示例12: Weight_Az

void Weight_Az(
  Word16 a[],      /* (i) Q12 : a[m+1]  LPC coefficients             */
  Word16 gamma,    /* (i) Q15 : Spectral expansion factor.           */
  Word16 m,        /* (i)     : LPC order.                           */
  Word16 ap[]      /* (o) Q12 : Spectral expanded LPC coefficients   */
)
{
  Word16 i, fac;

  ap[0] = a[0];
  fac   = gamma;
  for(i=1; i<m; i++)
  {
    ap[i] = round( L_mult(a[i], fac) );
    fac   = round( L_mult(fac, gamma) );
  }
  ap[m] = round( L_mult(a[m], fac) );
}
开发者ID:LeeonYu,项目名称:sipdroid,代码行数:18,代码来源:lpcfunc_equivalent_c.c


示例13: WebRtcG729fix_Weight_Az

void WebRtcG729fix_Weight_Az(
  int16_t a[],      /* (i) Q12 : a[m+1]  LPC coefficients             */
  int16_t gamma,    /* (i) Q15 : Spectral expansion factor.           */
  int16_t m,        /* (i)     : LPC order.                           */
  int16_t ap[]      /* (o) Q12 : Spectral expanded LPC coefficients   */
)
{
  int16_t i, fac;

  ap[0] = a[0];
  fac   = gamma;
  for(i=1; i<m; i++)
  {
    ap[i] = L_round( L_mult(a[i], fac) );
    fac   = L_round( L_mult(fac, gamma) );
  }
  ap[m] = L_round( L_mult(a[m], fac) );
}
开发者ID:sippet,项目名称:g729,代码行数:18,代码来源:lpcfunc.c


示例14: compress10

static Word16 compress10 (
       Word16 pos_indxA, /* i : signs of 4 pulses (signs only)             */
       Word16 pos_indxB,  /* i : position index of 8 pulses (pos only)     */
       Word16 pos_indxC) /* i : position and sign of 8 pulses (compressed) */
{
   Word16 indx, ia,ib,ic;

   ia = shr(pos_indxA, 1);
   ib = extract_l(L_shr(L_mult(shr(pos_indxB, 1), 5), 1));
   ic = extract_l(L_shr(L_mult(shr(pos_indxC, 1), 25), 1));            
   indx = shl(add(ia, add(ib, ic)), 3);
   ia = pos_indxA & 1;                                logic16 ();
   ib = shl((pos_indxB & 1), 1);                      logic16 ();
   ic = shl((pos_indxC & 1), 2);                      logic16 ();
   indx = add(indx , add(ia, add(ib, ic)));  
   
   return indx;

}
开发者ID:AlexKordic,项目名称:sandbox,代码行数:19,代码来源:c8_31pf.c


示例15: Mpy_32

Word32 Mpy_32(Word16 hi1, Word16 lo1, Word16 hi2, Word16 lo2)
{
  Word32 L_32;

  L_32 = L_mult(hi1, hi2);
  L_32 = L_mac(L_32, mult(hi1, lo2) , 1);
  L_32 = L_mac(L_32, mult(lo1, hi2) , 1);

  return( L_32 );
}
开发者ID:2831942318,项目名称:siphon,代码行数:10,代码来源:oper_32b.c


示例16: Vq_subvec

static Word16 Vq_subvec (/* o : quantization index,            Q0  */
    Word16 *lsf_r1,      /* i : 1st LSF residual vector,       Q15 */
    Word16 *lsf_r2,      /* i : 2nd LSF residual vector,       Q15 */
    const Word16 *dico,  /* i : quantization codebook,         Q15 */
    Word16 *wf1,         /* i : 1st LSF weighting factors      Q13 */
    Word16 *wf2,         /* i : 2nd LSF weighting factors      Q13 */  
    Word16 dico_size     /* i : size of quantization codebook, Q0  */
)
{
    Word16 index = 0; /* initialization only needed to keep gcc silent */
    Word16 i, temp;
    const Word16 *p_dico;
    Word32 dist_min, dist;

    dist_min = MAX_32;                                  move32 (); 
    p_dico = dico;                                      move16 (); 

    for (i = 0; i < dico_size; i++)
    {
        temp = sub (lsf_r1[0], *p_dico++);
        temp = mult (wf1[0], temp);
        dist = L_mult (temp, temp);

        temp = sub (lsf_r1[1], *p_dico++);
        temp = mult (wf1[1], temp);
        dist = L_mac (dist, temp, temp);

        temp = sub (lsf_r2[0], *p_dico++);
        temp = mult (wf2[0], temp);
        dist = L_mac (dist, temp, temp);

        temp = sub (lsf_r2[1], *p_dico++);
        temp = mult (wf2[1], temp);
        dist = L_mac (dist, temp, temp);

        test (); 
        if (L_sub (dist, dist_min) < (Word32) 0)
        {
            dist_min = dist;                            move32 (); 
            index = i;                                  move16 (); 
        }
    }

    /* Reading the selected vector */

    p_dico = &dico[shl (index, 2)];                     move16 (); 
    lsf_r1[0] = *p_dico++;                              move16 (); 
    lsf_r1[1] = *p_dico++;                              move16 (); 
    lsf_r2[0] = *p_dico++;                              move16 (); 
    lsf_r2[1] = *p_dico++;                              move16 (); 

    return index;

}
开发者ID:DanielGit,项目名称:Intrisit201202,代码行数:54,代码来源:q_plsf_5.c


示例17: fnLog2

Word32 fnLog2(Word32 L_Input)
{

	static Word16
	    swC0 = -0x2b2a, swC1 = 0x7fc5, swC2 = -0x54d0;

	Word16 siShiftCnt, swInSqrd, swIn;
	Word32 LwIn;

/*_________________________________________________________________________
 |                                                                         |
 |                              Executable Code                            |
 |_________________________________________________________________________|
*/

	/* normalize input and store shifts required */
	/* ----------------------------------------- */

	siShiftCnt = norm_l(L_Input);
	LwIn = L_shl(L_Input, siShiftCnt);
	siShiftCnt = add(siShiftCnt, 1);
	siShiftCnt = negate(siShiftCnt);

	/* calculate x*x*c0 */
	/* ---------------- */

	swIn = extract_h(LwIn);
	swInSqrd = mult_r(swIn, swIn);
	LwIn = L_mult(swInSqrd, swC0);

	/* add x*c1 */
	/* --------- */

	LwIn = L_mac(LwIn, swIn, swC1);

	/* add c2 */
	/* ------ */

	LwIn = L_add(LwIn, L_deposit_h(swC2));

	/* apply *(4/32) */
	/* ------------- */

	LwIn = L_shr(LwIn, 3);
	LwIn = LwIn & 0x03ffffff;
	siShiftCnt = shl(siShiftCnt, 10);
	LwIn = L_add(LwIn, L_deposit_h(siShiftCnt));

	/* return log2 */
	/* ----------- */

	return (LwIn);
}
开发者ID:RupW,项目名称:celp13k,代码行数:53,代码来源:math_adv.c


示例18: FNevChebP

Word16 FNevChebP(
                 Word16 x,       /* (i) Q15: value 	               */
                 Word16 *t_man,  /* (i) Q7: mantissa of coefficients */
                 Word16 *t_exp,  /* (i): exponent fo cofficients     */
                 Word16 nd2)     /* (i): order                       */
{
   Word16 i;
   Word16 x2;
   Word16 b_man[NAB], b_exp[NAB];
   Word16 y;
   Word32 a0;

   x2 = x;                                                           // 2x in Q14
   b_man[0] = t_man[nd2];
   b_exp[0] = t_exp[nd2];                                            // b[0] in Q(7+t_exp)
   a0 = L_mult(x2, b_man[0]);
   a0 = L_shr(a0, sub(b_exp[0], 1));                                 // t*b[0] in Q23
   a0 = L_add(a0, L_shr(L_deposit_h(t_man[nd2-1]), t_exp[nd2-1]));   // c[nd2-1] + t*b[0] in Q23
   b_exp[1] = norm_l(a0);
   b_man[1] = intround(L_shl(a0, b_exp[1]));                            // b[1] = c[nd2-1] + t * b[0]

   for (i=2;i<nd2;i++){
      a0 = L_mult(x2, b_man[i-1]);
      a0 = L_shr(a0, sub(b_exp[i-1], 1));                            // t*b[i-1] in Q23
      a0 = L_add(a0, L_shr(L_deposit_h(t_man[nd2-i]), t_exp[nd2-i]));// c[nd2-i] + t*b[i-1] in Q23
      a0 = L_sub(a0, L_shr(L_deposit_h(b_man[i-2]), b_exp[i-2]));    // c[nd2-i] + t*b[i-1] - b[i-2] in Q23
      b_exp[i] = norm_l(a0);
      b_man[i] = intround(L_shl(a0, b_exp[i]));                         // b[i] = c[nd2-i] - b[i-2] + t * b[i-1]
   }

   a0 = L_mult(x, b_man[nd2-1]);
   a0 = L_shr(a0, b_exp[nd2-1]);                                     // x*b[nd2-1] in Q23
   a0 = L_add(a0, L_shr(L_deposit_h(t_man[0]), t_exp[0]));           // c[0] + x*b[nd2-1] in Q23
   a0 = L_sub(a0, L_shr(L_deposit_h(b_man[nd2-2]), b_exp[nd2-2]));   // c[0] + x*b[nd2-1] - b[nd2-2] in Q23

   y = intround(L_shl(a0, 6));                                          // Q13

   return y;                                                         // Q13
}
开发者ID:371816210,项目名称:mysipdroid,代码行数:39,代码来源:a2lsp.c


示例19: MR475_quant_store_results

/*
********************************************************************************
*                         PRIVATE PROGRAM CODE
********************************************************************************
*/
void MR475_quant_store_results(

    gc_predState *pred_st, /* i/o: gain predictor state struct               */
    const Word16 *p,       /* i  : pointer to selected quantizer table entry */
    Word16 gcode0,         /* i  : predicted CB gain,     Q(14 - exp_gcode0) */
    Word16 exp_gcode0,     /* i  : exponent of predicted CB gain,        Q0  */
    Word16 *gain_pit,      /* o  : Pitch gain,                           Q14 */
    Word16 *gain_cod       /* o  : Code gain,                            Q1  */
)
{

    Word16 g_code, exp, frac, tmp;
    Word32 L_tmp;

    Word16 qua_ener_MR122; /* o  : quantized energy error, MR122 version Q10 */
    Word16 qua_ener;       /* o  : quantized energy error,               Q10 */

    /* Read the quantized gains */
    *gain_pit = *p++;                
    g_code = *p++;                   

    /*------------------------------------------------------------------*
     *  calculate final fixed codebook gain:                            *
     *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~                            *
     *                                                                  *
     *   gc = gc0 * g                                                   *
     *------------------------------------------------------------------*/

    L_tmp = L_mult(g_code, gcode0);
    L_tmp = L_shr(L_tmp, sub(10, exp_gcode0));
    *gain_cod = extract_h(L_tmp);

    /*------------------------------------------------------------------*
     *  calculate predictor update values and update gain predictor:    *
     *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~    *
     *                                                                  *
     *   qua_ener       = log2(g)                                       *
     *   qua_ener_MR122 = 20*log10(g)                                   *
     *------------------------------------------------------------------*/

    Log2 (L_deposit_l (g_code), &exp, &frac); /* Log2(x Q12) = log2(x) + 12 */
    exp = sub(exp, 12);

    tmp = shr_r (frac, 5);
    qua_ener_MR122 = add (tmp, shl (exp, 10));

    L_tmp = Mpy_32_16(exp, frac, 24660); /* 24660 Q12 ~= 6.0206 = 20*log10(2) */
    qua_ener = round (L_shl (L_tmp, 13)); /* Q12 * Q0 = Q13 -> Q10 */

    gc_pred_update(pred_st, qua_ener_MR122, qua_ener);
}
开发者ID:NearZhxiAo,项目名称:3730,代码行数:56,代码来源:mr475_quant_store_results.c


示例20: Syn_filte

void Syn_filte(
  Word16 m,        /* (i)    : LPC order                         */
  Word16 a[],     /* (i) Q12 : a[m+1] prediction coefficients   (m=10)  */
  Word16 x[],     /* (i)     : input signal                             */
  Word16 y[],     /* (o)     : output signal                            */
  Word16 lg,      /* (i)     : size of filtering                        */
  Word16 mem[],   /* (i/o)   : memory associated with this filtering.   */
  Word16 update   /* (i)     : 0=no update, 1=update of memory.         */
)
{
  Word16 i, j;
  Word32 s;
  Word16 tmp[80];     /* This is usually done by memory allocation (lg+M) */
  Word16 *yy;

  /* Copy mem[] to yy[] */

  yy = tmp;

  for(i=0; i<m; i++)
  {
    *yy++ = mem[i];
  }

  /* Do the filtering. */

  for (i = 0; i < lg; i++)
  {
    s = L_mult(x[i], a[0]);
    for (j = 1; j <= m; j++)
      s = L_msu(s, a[j], yy[-j]);

    s = L_shl(s, 3);
    *yy++ = round(s);
  }

  for(i=0; i<lg; i++)
  {
    y[i] = tmp[i+m];
  }

  /* Update of memory if update==1 */

  if(update != 0)
     for (i = 0; i < m; i++)
     {
       mem[i] = y[lg-m+i];
     }

 return;
}
开发者ID:SibghatullahSheikh,项目名称:codecs,代码行数:51,代码来源:filtere.c



注:本文中的L_mult函数示例由纯净天空整理自Github/MSDocs等源码及文档管理平台,相关代码片段筛选自各路编程大神贡献的开源项目,源码版权归原作者所有,传播和使用请参考对应项目的License;未经允许,请勿转载。


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