/*----------------------------------------------------------------------------
; FUNCTION CODE
----------------------------------------------------------------------------*/
void code_10i40_35bits(
Word16 x[], /* (i) : target vector */
Word16 cn[], /* (i) : residual after long term prediction */
Word16 h[], /* (i) : impulse response of weighted synthesis filter
h[-L_subfr..-1] must be set to zero */
Word16 cod[], /* (o) : algebraic (fixed) codebook excitation */
Word16 y[], /* (o) : filtered fixed codebook excitation */
Word16 indx[], /* (o) : index of 10 pulses (sign + position) */
Flag *pOverflow /* (i/o) : overflow Flag */
)
{
Word16 ipos[NB_PULSE], pos_max[NB_TRACK], codvec[NB_PULSE];
Word16 dn[L_CODE], sign[L_CODE];
Word16 rr[L_CODE][L_CODE], i;
cor_h_x(h, x, dn, 2, pOverflow);
set_sign12k2(dn, cn, sign, pos_max, NB_TRACK, ipos, STEP, pOverflow);
cor_h(h, sign, rr, pOverflow);
search_10and8i40(NB_PULSE, STEP, NB_TRACK,
dn, rr, ipos, pos_max, codvec, pOverflow);
build_code(codvec, sign, cod, h, y, indx, pOverflow);
for (i = 0; i < 10; i++)
{
q_p(&indx[i], i);
}
return;
}
/*
------------------------------------------------------------------------------
FUNCTION NAME: code_2i40_11bits
------------------------------------------------------------------------------
INPUT AND OUTPUT DEFINITIONS
Inputs:
x, target vector, array of type Word16
h, impulse response of weighted synthesis filter, array of type Word16
T0, Pitch lag, variable of type Word16
pitch_sharp, Last quantized pitch gain, variable of type Word16
Outputs:
code[], Innovative codebook, array of type Word16
y[], filtered fixed codebook excitation, array of type Word16
sign, Signs of 2 pulses, pointer of type Word16 *
pOverflow Flag set when overflow occurs, pointer of type Flag *
Returns:
index
Global Variables Used:
None
Local Variables Needed:
None
------------------------------------------------------------------------------
FUNCTION DESCRIPTION
Searches a 11 bit algebraic codebook containing 2 pulses
in a frame of 40 samples.
The code length is 40, containing 2 nonzero pulses: i0...i1.
All pulses can have two possible amplitudes: +1 or -1.
Pulse i0 can have 2x8=16 possible positions, pulse i1 can have
4x8=32 positions.
i0 : 1, 6, 11, 16, 21, 26, 31, 36.
3, 8, 13, 18, 23, 28, 33, 38.
i1 : 0, 5, 10, 15, 20, 25, 30, 35.
1, 6, 11, 16, 21, 26, 31, 36.
2, 7, 12, 17, 22, 27, 32, 37.
4, 9, 14, 19, 24, 29, 34, 39.
------------------------------------------------------------------------------
REQUIREMENTS
None
------------------------------------------------------------------------------
REFERENCES
c2_11pf.c, UMTS GSM AMR speech codec, R99 - Version 3.2.0, March 2, 2001
------------------------------------------------------------------------------
PSEUDO-CODE
------------------------------------------------------------------------------
CAUTION [optional]
[State any special notes, constraints or cautions for users of this function]
------------------------------------------------------------------------------
*/
Word16 code_2i40_11bits(
Word16 x[], /* i : target vector */
Word16 h[], /* i : impulse response of weighted synthesis filter */
/* h[-L_subfr..-1] must be set to zero. */
Word16 T0, /* i : Pitch lag */
Word16 pitch_sharp, /* i : Last quantized pitch gain */
Word16 code[], /* o : Innovative codebook */
Word16 y[], /* o : filtered fixed codebook excitation */
Word16 * sign, /* o : Signs of 2 pulses */
Flag * pOverflow /* o : Flag set when overflow occurs */
)
{
Word16 codvec[NB_PULSE];
Word16 dn[L_CODE];
Word16 dn2[L_CODE];
Word16 dn_sign[L_CODE];
Word16 rr[L_CODE][L_CODE];
Word16 i;
Word16 index;
Word16 sharp;
Word16 tempWord;
sharp = pitch_sharp << 1;
if (T0 < L_CODE)
{
for (i = T0; i < L_CODE; i++)
{
tempWord =
mult(
h[i - T0],
sharp,
pOverflow);
h[i] =
add_16(
h[i],
tempWord,
pOverflow);
}
}
cor_h_x(
h,
x,
dn,
1,
pOverflow);
set_sign(
dn,
dn_sign,
dn2,
8); /* dn2[] not used in this codebook search */
cor_h(
h,
dn_sign,
rr,
pOverflow);
search_2i40(
dn,
rr,
codvec,
pOverflow);
/* function result */
index =
build_code(
codvec,
dn_sign,
code,
h,
y,
sign,
pOverflow);
/*
* Compute innovation vector gain.
* Include fixed-gain pitch contribution into code[].
*/
if (T0 < L_CODE)
{
for (i = T0; i < L_CODE; i++)
{
tempWord =
mult(
code[i - T0],
sharp,
pOverflow);
code[i] =
add_16(
code[i],
tempWord,
pOverflow);
}
}
return index;
}
Word16 code_2i40_9bits(
Word16 subNr, /* i : subframe number */
Word16 x[], /* i : target vector */
Word16 h[], /* i : impulse response of weighted synthesis */
/* filter h[-L_subfr..-1] must be set to 0. */
Word16 T0, /* i : Pitch lag */
Word16 pitch_sharp, /* i : Last quantized pitch gain */
Word16 code[], /* o : Innovative codebook */
Word16 y[], /* o : filtered fixed codebook excitation */
Word16 * sign, /* o : Signs of 2 pulses */
Flag * pOverflow /* o : Flag set when overflow occurs */
)
{
Word16 codvec[NB_PULSE];
Word16 dn[L_CODE];
Word16 dn2[L_CODE];
Word16 dn_sign[L_CODE];
Word16 rr[L_CODE][L_CODE];
register Word16 i;
Word16 index;
Word16 sharp;
Word16 temp;
Word32 L_temp;
L_temp = ((Word32) pitch_sharp) << 1;
/* Check for overflow condition */
if (L_temp != (Word32)((Word16) L_temp))
{
*(pOverflow) = 1;
sharp = (pitch_sharp > 0) ? MAX_16 : MIN_16;
}
else
{
sharp = (Word16) L_temp;
}
if (T0 < L_CODE)
{
for (i = T0; i < L_CODE; i++)
{
temp =
mult(
*(h + i - T0),
sharp,
pOverflow);
*(h + i) =
add(
*(h + i),
temp,
pOverflow);
}
}
cor_h_x(
h,
x,
dn,
1,
pOverflow);
/* dn2[] not used in this codebook search */
set_sign(
dn,
dn_sign,
dn2,
8);
cor_h(
h,
dn_sign,
rr,
pOverflow);
search_2i40(
subNr,
dn,
rr,
codvec,
pOverflow);
index =
build_code(
subNr,
codvec,
dn_sign,
code,
h,
y,
sign,
pOverflow);
/*-----------------------------------------------------------------*
* Compute innovation vector gain. *
* Include fixed-gain pitch contribution into code[]. *
*-----------------------------------------------------------------*/
if (T0 < L_CODE)
{
for (i = T0; i < L_CODE; i++)
{
temp =
mult(
*(code + i - T0),
sharp,
pOverflow);
*(code + i) =
add(
*(code + i),
temp,
pOverflow);
}
}
return(index);
}