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/*---------------------------------------------------------------------------*
* cheldsp4.c *
* *
* Copyright 2007, 2008 Nuance Communciations, Inc. *
* *
* Licensed under the Apache License, Version 2.0 (the 'License'); *
* you may not use this file except in compliance with the License. *
* *
* You may obtain a copy of the License at *
* http://www.apache.org/licenses/LICENSE-2.0 *
* *
* Unless required by applicable law or agreed to in writing, software *
* distributed under the License is distributed on an 'AS IS' BASIS, *
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
* See the License for the specific language governing permissions and *
* limitations under the License. *
* *
*---------------------------------------------------------------------------*/
#include <stdlib.h>
#include <limits.h>
#ifndef _RTT
#include <stdio.h>
#endif
#include <string.h>
#include <math.h>
#include <assert.h>
#include "hmm_desc.h"
#include "voicing.h"
#include "specnorm.h"
#include "portable.h"
#include "front.h"
#include "portable.h"
#include "sh_down.h"
#include "memmove.h"
#define DEBUG 0
#define LOG_AS_PRINT 0
#if LOG_AS_PRINT /* BP temp debug mode */
#define log_report printf
#endif
/* Rasta */
#define RASTA_SOFT_START 1 /* if this is not 1, rasta initialization is weighted */
#if RASTA_SOFT_START
#define RASTA_CONSTANT 0.92
#define RASTA_SOFT_CONST (RASTA_CONSTANT/(1-RASTA_CONSTANT))
#else
#define RASTA_CONSTANT 0.85
#endif
static void regress(cepdata *rg, const cepdata *cp_buf, unsigned short frmind,
int mel_dim);
static void dd_regress(cepdata *dd, const cepdata *cp_buf, unsigned short frmind,
int mel_dim);
static void scale_data(const front_cep *cepobj, const featdata *rpram, featdata *pram1,
featdata *pram2, featdata *ddpram, const cepdata *rast,
const cepdata *cep, const cepdata *rcep, const cepdata *ddcep);
static void pack_frame(const front_cep *cepobj, featdata *dest_frame,
const featdata *rasta_data, const featdata *mel_data,
const featdata *del_data, const featdata *deldel_data);
static void regress(cepdata *rg, const cepdata*cp_buf, unsigned short frmind,
int mel_dim)
{
int i, j, d;
cepdata val;
const cepdata* cpt;
/*
static cepdata a = (cepdata) 0.0;
if (a == (cepdata) 0.0)
{
for (j = 1; j <= DELTA; j++)
a += j * j;
a *= (cepdata) 2.0;
}
*/
/* replace above code with the following constant */
cepdata a = (DELTA * (DELTA + 1) * (2 * DELTA + 1) / 6) * 2;
d = DELTA;
if (frmind < Q2 - 1)
{
cpt = cp_buf + (d - 1) * (mel_dim + 1);
for (i = 0; i <= mel_dim; i++, cpt++)
rg[i] = (cepdata) SHIFT_DOWN((*cpt - *(cpt + mel_dim + 1)), 1 + COSINE_TABLE_SHIFT); /* Shift does rounding. */
} /* reversed */
else
/* regression coefficients */
for (i = 0; i <= mel_dim; i++)
{
cpt = cp_buf + i;
val = (cepdata) 0.;
for (j = 0; j < Q2; j++, cpt += (mel_dim + 1))
val += (d - j) * SHIFT_DOWN(*cpt, 5); /* note d-j from j-d */
rg[i] = (cepdata) SHIFT_DOWN((bigdata)(val / a), COSINE_TABLE_SHIFT - 5); /* scale down the deltas here */
}
return;
}
static const cepdata deldel[] = {2, 0, -1, -2, -1, 0, 2}; /* delta - delta */
void dd_regress(cepdata *dd, const cepdata *cp_buf, unsigned short frmind, int mel_dim)
/*
** Computes ALL delta delta mel cep pars. BP 8/96 */
{
int i, j, d;
cepdata val;
const cepdata *cpt;
d = DELTA;
if (frmind < Q2 - 1)
{
cpt = cp_buf + (mel_dim + 1);
for (i = 0;i <= mel_dim;i++)
{
dd[i] = (*(cpt + 2 * (mel_dim + 1) + i)
+ *(cpt + i)
- 2 * (*(cpt + (mel_dim + 1) + i)));
/* Undo cosine table shifting */
dd[i] = (cepdata) SHIFT_DOWN((bigdata)(dd[i]), COSINE_TABLE_SHIFT);
}
}
else
{
/* DD coefficient*/
for (i = 0; i <= mel_dim; i++)
{
cpt = cp_buf + i;
val = (cepdata) 0.;
for (j = 0; j < Q2; j++, cpt += (mel_dim + 1))
val += deldel[j] * SHIFT_DOWN((*cpt), 4); /* Q2 frames forward, not around...? */
/* Watch out for overflows here */
dd[i] = (cepdata) SHIFT_DOWN((bigdata)(val), COSINE_TABLE_SHIFT - 4);
}
}
return;
}
static void scale_data(const front_cep *cepobj, const featdata *rpram, featdata *pram1,
featdata *pram2, featdata *ddpram, const cepdata *rast,
const cepdata *cep, const cepdata *rcep, const cepdata *ddcep)
{
size_t i;
bigdata a;
if (pram1)
for (i = 0; i <= cepobj->mel_dim; i++)
{
/* Now take the costable scaling off the ceps. */
ASSERT((cepobj->melA_scale[i] *(float)SHIFT_DOWN(cep[i], COSINE_TABLE_SHIFT))
< LONG_MAX);
ASSERT((cepobj->melA_scale[i] *(float)SHIFT_DOWN(cep[i], COSINE_TABLE_SHIFT))
> -LONG_MAX);
a = (bigdata)(SHIFT_DOWN((bigdata)cepobj->melA_scale[i]
* (bigdata) SHIFT_DOWN(cep[i], COSINE_TABLE_SHIFT)
+ (bigdata)cepobj->melB_scale[i], BYTERANGE_SHIFT + LOG_SCALE_SHIFT));
pram1[i] = (featdata) MAKEBYTE(a);
}
if (pram2)
for (i = 0; i <= cepobj->mel_dim; i++)
{
ASSERT((cepobj->dmelA_scale[i] *(float)rcep[i]) < LONG_MAX);
ASSERT((cepobj->dmelA_scale[i] *(float)rcep[i]) > -LONG_MAX);
a = (bigdata) SHIFT_DOWN((bigdata)cepobj->dmelA_scale[i] * (bigdata)rcep[i] +
(bigdata)cepobj->dmelB_scale[i], BYTERANGE_SHIFT + LOG_SCALE_SHIFT);
pram2[i] = (featdata) MAKEBYTE(a);
}
/* Double-deltas parameter scaling */
if (cepobj->do_dd_mel && ddpram)
for (i = 0; i <= cepobj->mel_dim; i++)
{
ASSERT((cepobj->ddmelA_scale[i] *(float)ddcep[i]) < LONG_MAX);
ASSERT((cepobj->ddmelA_scale[i] *(float)ddcep[i]) > -LONG_MAX);
a = (bigdata) SHIFT_DOWN((bigdata)cepobj->ddmelA_scale[i] * (bigdata)ddcep[i] +
(bigdata)cepobj->ddmelB_scale[i], BYTERANGE_SHIFT + LOG_SCALE_SHIFT);
ddpram[i] = (featdata) MAKEBYTE(a); /* sort out scaling of deldel? */
}
return;
}
static void pack_frame(const front_cep *cepobj, featdata *dest_frame,
const featdata *rasta_data, const featdata *mel_data,
const featdata *del_data, const featdata *deldel_data)
{
size_t ii, cnt;
cnt = 0;
for (ii = 0; ii < cepobj->mel_dim; ii++, cnt++)
dest_frame[cnt] = (featdata) mel_data[ii];
for (ii = 0; ii < cepobj->mel_dim; ii++, cnt++)
dest_frame[cnt] = (featdata) del_data[ii];
if (cepobj->do_dd_mel)
for (ii = 0; ii < cepobj->mel_dim; ii++, cnt++)
dest_frame[cnt] = (featdata) deldel_data[ii];
#if DEBUG
log_report("Frame: ");
for (ii = 0; ii < 24; ii++)
log_report("%d ", dest_frame[ii]);
if (cepobj->do_dd_mel)
for (ii = 0; ii < cepobj->mel_dim; ii++)
log_report("%d ", dest_frame[2*cepobj->mel_dim+ii]);
log_report("\n");
#endif
return;
}
int make_std_frame(front_channel *channel, front_cep *cepobj, featdata *hFrame)
{
featdata rpram[MAX_CEP_DIM+1], spram1[MAX_CEP_DIM+1], spram2[MAX_CEP_DIM+1], ddpram[MAX_CEP_DIM+1];
cepdata rgmcep[MAX_CEP_DIM+1]; /*regression MCEP coef. */
cepdata ddmcep[MAX_CEP_DIM+1]; /*del-del-MCEP coef. */
cepdata rastapar[MAX_CEP_DIM+1]; /*del-del-MCEP coef. */
channel->frame_valid = False;
if (channel->frame_count >= channel->frame_delay)
{
/* Part III. Delta Cepstrum calculations
*/
regress(rgmcep, channel->cep, (unsigned short) channel->frame_count, channel->mel_dim);
if (cepobj->do_dd_mel)
dd_regress(ddmcep, channel->cep, (unsigned short) channel->frame_count, channel->mel_dim);
#if DEBUG
log_report("Cep before scaling: ");
write_scaled_frames(channel->mel_dim + 1, 1,
channel->cep + (DELTA) *(channel->mel_dim + 1),
D_FIXED, (float)1 / (0x01 << (LOG_SCALE_SHIFT + COSINE_TABLE_SHIFT)));
log_report("Delta Cep before scaling: ");
write_scaled_frames(channel->mel_dim + 1, 1, rgmcep, D_FIXED, (float)1 / (0x01 << LOG_SCALE_SHIFT));
log_report("DeltaDelta Cep before scaling: ");
write_scaled_frames(channel->mel_dim + 1, 1, ddmcep, D_FIXED, (float)1 / (0x01 << LOG_SCALE_SHIFT));
#endif
scale_data(cepobj, rpram, spram1, spram2, ddpram, rastapar,
channel->cep + (DELTA) *(channel->mel_dim + 1), rgmcep, ddmcep);
#if DEBUG
log_report("Cep after scaling: ");
write_frames(channel->mel_dim + 1, 1, spram1, D_CHAR);
log_report("Delta Cep after scaling: ");
write_frames(channel->mel_dim + 1, 1, spram2, D_CHAR);
log_report("DeltaDelta Cep after scaling: ");
write_frames(channel->mel_dim + 1, 1, ddpram, D_CHAR);
#endif
channel->frame_valid = True; /* True even if do_skip_even_frames, */
pack_frame(cepobj, hFrame, rpram, spram1, spram2, ddpram);
} /* >=DELTA */
channel->frame_count++;
return (channel->frame_valid);
}
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