Add m-esr52 at 52.6.0

1 files changed, 425 insertions, 0 deletions

diff --git a/media/sphinxbase/src/libsphinxbase/fe/fe_noise.c b/media/sphinxbase/src/libsphinxbase/fe/fe_noise.c
new file mode 100644
index 000000000..4fb6d21a9
--- /dev/null
+++ b/media/sphinxbase/src/libsphinxbase/fe/fe_noise.c
@@ -0,0 +1,425 @@
+/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* ====================================================================
+ * Copyright (c) 2013 Carnegie Mellon University.  All rights 
+ * reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer. 
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * This work was supported in part by funding from the Defense Advanced 
+ * Research Projects Agency and the National Science Foundation of the 
+ * United States of America, and the CMU Sphinx Speech Consortium.
+ *
+ * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND 
+ * ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
+ * NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * ====================================================================
+ *
+ */
+
+/* This noise removal algorithm is inspired by the following papers
+ * Computationally Efficient Speech Enchancement by Spectral Minina Tracking
+ * by G. Doblinger
+ *
+ * Power-Normalized Cepstral Coefficients (PNCC) for Robust Speech Recognition
+ * by C. Kim.
+ *
+ * For the recent research and state of art see papers about IMRCA and
+ * A Minimum-Mean-Square-Error Noise Reduction Algorithm On Mel-Frequency
+ * Cepstra For Robust Speech Recognition by Dong Yu and others
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <math.h>
+
+#include "sphinxbase/prim_type.h"
+#include "sphinxbase/ckd_alloc.h"
+#include "sphinxbase/strfuncs.h"
+#include "sphinxbase/err.h"
+
+#include "fe_noise.h"
+#include "fe_internal.h"
+
+/* Noise supression constants */
+#define SMOOTH_WINDOW 4
+#define LAMBDA_POWER 0.7
+#define LAMBDA_A 0.995
+#define LAMBDA_B 0.5
+#define LAMBDA_T 0.85
+#define MU_T 0.2
+#define MAX_GAIN 20
+
+struct noise_stats_s {
+    /* Smoothed power */
+    powspec_t *power;
+    /* Noise estimate */
+    powspec_t *noise;
+    /* Signal floor estimate */
+    powspec_t *floor;
+    /* Peak for temporal masking */
+    powspec_t *peak;
+
+    /* Initialize it next time */
+    uint8 undefined;
+    /* Number of items to process */
+    uint32 num_filters;
+
+    /* Precomputed constants */
+    powspec_t lambda_power;
+    powspec_t comp_lambda_power;
+    powspec_t lambda_a;
+    powspec_t comp_lambda_a;
+    powspec_t lambda_b;
+    powspec_t comp_lambda_b;
+    powspec_t lambda_t;
+    powspec_t mu_t;
+    powspec_t max_gain;
+    powspec_t inv_max_gain;
+
+    powspec_t smooth_scaling[2 * SMOOTH_WINDOW + 3];
+};
+
+static void
+fe_lower_envelope(noise_stats_t *noise_stats, powspec_t * buf, powspec_t * floor_buf, int32 num_filt)
+{
+    int i;
+
+    for (i = 0; i < num_filt; i++) {
+#ifndef FIXED_POINT
+        if (buf[i] >= floor_buf[i]) {
+            floor_buf[i] =
+                noise_stats->lambda_a * floor_buf[i] + noise_stats->comp_lambda_a * buf[i];
+        }
+        else {
+            floor_buf[i] =
+                noise_stats->lambda_b * floor_buf[i] + noise_stats->comp_lambda_b * buf[i];
+        }
+#else
+        if (buf[i] >= floor_buf[i]) {
+            floor_buf[i] = fe_log_add(noise_stats->lambda_a + floor_buf[i],
+                                  noise_stats->comp_lambda_a + buf[i]);
+        }
+        else {
+            floor_buf[i] = fe_log_add(noise_stats->lambda_b + floor_buf[i],
+                                  noise_stats->comp_lambda_b + buf[i]);
+        }
+#endif
+    }
+}
+
+/* temporal masking */
+static void
+fe_temp_masking(noise_stats_t *noise_stats, powspec_t * buf, powspec_t * peak, int32 num_filt)
+{
+    powspec_t cur_in;
+    int i;
+
+    for (i = 0; i < num_filt; i++) {
+        cur_in = buf[i];
+
+#ifndef FIXED_POINT
+        peak[i] *= noise_stats->lambda_t;
+        if (buf[i] < noise_stats->lambda_t * peak[i])
+            buf[i] = peak[i] * noise_stats->mu_t;
+#else
+        peak[i] += noise_stats->lambda_t;
+        if (buf[i] < noise_stats->lambda_t + peak[i])
+            buf[i] = peak[i] + noise_stats->mu_t;
+#endif
+
+        if (cur_in > peak[i])
+            peak[i] = cur_in;
+    }
+}
+
+/* spectral weight smoothing */
+static void
+fe_weight_smooth(noise_stats_t *noise_stats, powspec_t * buf, powspec_t * coefs, int32 num_filt)
+{
+    int i, j;
+    int l1, l2;
+    powspec_t coef;
+
+    for (i = 0; i < num_filt; i++) {
+        l1 = ((i - SMOOTH_WINDOW) > 0) ? (i - SMOOTH_WINDOW) : 0;
+        l2 = ((i + SMOOTH_WINDOW) <
+              (num_filt - 1)) ? (i + SMOOTH_WINDOW) : (num_filt - 1);
+
+#ifndef FIXED_POINT
+        coef = 0;
+        for (j = l1; j <= l2; j++) {
+            coef += coefs[j];
+        }
+        buf[i] = buf[i] * (coef / (l2 - l1 + 1));
+#else
+        coef = MIN_FIXLOG;
+        for (j = l1; j <= l2; j++) {
+            coef = fe_log_add(coef, coefs[j]);
+        }        
+        buf[i] = buf[i] + coef - noise_stats->smooth_scaling[l2 - l1 + 1];
+#endif
+
+    }
+}
+
+noise_stats_t *
+fe_init_noisestats(int num_filters)
+{
+    int i;
+    noise_stats_t *noise_stats;
+
+    noise_stats = (noise_stats_t *) ckd_calloc(1, sizeof(noise_stats_t));
+
+    noise_stats->power =
+        (powspec_t *) ckd_calloc(num_filters, sizeof(powspec_t));
+    noise_stats->noise =
+        (powspec_t *) ckd_calloc(num_filters, sizeof(powspec_t));
+    noise_stats->floor =
+        (powspec_t *) ckd_calloc(num_filters, sizeof(powspec_t));
+    noise_stats->peak =
+        (powspec_t *) ckd_calloc(num_filters, sizeof(powspec_t));
+
+    noise_stats->undefined = TRUE;
+    noise_stats->num_filters = num_filters;
+
+#ifndef FIXED_POINT
+    noise_stats->lambda_power = LAMBDA_POWER;
+    noise_stats->comp_lambda_power = 1 - LAMBDA_POWER;
+    noise_stats->lambda_a = LAMBDA_A;
+    noise_stats->comp_lambda_a = 1 - LAMBDA_A;
+    noise_stats->lambda_b = LAMBDA_B;
+    noise_stats->comp_lambda_b = 1 - LAMBDA_B;
+    noise_stats->lambda_t = LAMBDA_T;
+    noise_stats->mu_t = MU_T;
+    noise_stats->max_gain = MAX_GAIN;
+    noise_stats->inv_max_gain = 1.0 / MAX_GAIN;
+    
+    for (i = 1; i < 2 * SMOOTH_WINDOW + 1; i++) {
+        noise_stats->smooth_scaling[i] = 1.0 / i;
+    }
+#else
+    noise_stats->lambda_power = FLOAT2FIX(log(LAMBDA_POWER));
+    noise_stats->comp_lambda_power = FLOAT2FIX(log(1 - LAMBDA_POWER));
+    noise_stats->lambda_a = FLOAT2FIX(log(LAMBDA_A));
+    noise_stats->comp_lambda_a = FLOAT2FIX(log(1 - LAMBDA_A));
+    noise_stats->lambda_b = FLOAT2FIX(log(LAMBDA_B));
+    noise_stats->comp_lambda_b = FLOAT2FIX(log(1 - LAMBDA_B));
+    noise_stats->lambda_t = FLOAT2FIX(log(LAMBDA_T));
+    noise_stats->mu_t = FLOAT2FIX(log(MU_T));
+    noise_stats->max_gain = FLOAT2FIX(log(MAX_GAIN));
+    noise_stats->inv_max_gain = FLOAT2FIX(log(1.0 / MAX_GAIN));
+
+    for (i = 1; i < 2 * SMOOTH_WINDOW + 3; i++) {
+        noise_stats->smooth_scaling[i] = FLOAT2FIX(log(i));
+    }
+#endif
+
+    return noise_stats;
+}
+
+void
+fe_reset_noisestats(noise_stats_t * noise_stats)
+{
+    if (noise_stats)
+        noise_stats->undefined = TRUE;
+}
+
+void
+fe_free_noisestats(noise_stats_t * noise_stats)
+{
+    ckd_free(noise_stats->power);
+    ckd_free(noise_stats->noise);
+    ckd_free(noise_stats->floor);
+    ckd_free(noise_stats->peak);
+    ckd_free(noise_stats);
+}
+
+/**
+ * For fixed point we are doing the computation in a fixlog domain,
+ * so we have to add many processing cases.
+ */
+void
+fe_track_snr(fe_t * fe, int32 *in_speech)
+{
+    powspec_t *signal;
+    powspec_t *gain;
+    noise_stats_t *noise_stats;
+    powspec_t *mfspec;
+    int32 i, num_filts;
+    powspec_t lrt, snr, max_signal, log_signal;
+
+    if (!(fe->remove_noise || fe->remove_silence)) {
+        *in_speech = TRUE;
+        return;
+    }
+
+    noise_stats = fe->noise_stats;
+    mfspec = fe->mfspec;
+    num_filts = noise_stats->num_filters;
+
+    signal = (powspec_t *) ckd_calloc(num_filts, sizeof(powspec_t));
+
+    if (noise_stats->undefined) {
+        for (i = 0; i < num_filts; i++) {
+            noise_stats->power[i] = mfspec[i];
+            noise_stats->noise[i] = mfspec[i];
+#ifndef FIXED_POINT
+            noise_stats->floor[i] = mfspec[i] / noise_stats->max_gain;
+            noise_stats->peak[i] = 0.0;       
+#else
+            noise_stats->floor[i] = mfspec[i] - noise_stats->max_gain;
+            noise_stats->peak[i] = MIN_FIXLOG;
+#endif
+        }
+        noise_stats->undefined = FALSE;
+    }
+
+    /* Calculate smoothed power */
+    for (i = 0; i < num_filts; i++) {
+#ifndef FIXED_POINT
+        noise_stats->power[i] =
+            noise_stats->lambda_power * noise_stats->power[i] + noise_stats->comp_lambda_power * mfspec[i];   
+#else
+        noise_stats->power[i] = fe_log_add(noise_stats->lambda_power + noise_stats->power[i],
+            noise_stats->comp_lambda_power + mfspec[i]);
+#endif
+    }
+
+    /* Noise estimation and vad decision */
+    fe_lower_envelope(noise_stats, noise_stats->power, noise_stats->noise, num_filts);
+
+    lrt = FLOAT2FIX(0.0f);
+    max_signal = FLOAT2FIX(0.0f);
+    for (i = 0; i < num_filts; i++) {
+#ifndef FIXED_POINT
+        signal[i] = noise_stats->power[i] - noise_stats->noise[i];
+        if (signal[i] < 1.0)
+            signal[i] = 1.0;
+        snr = log(noise_stats->power[i] / noise_stats->noise[i]);
+        log_signal = log(signal[i]);
+#else
+        signal[i] = fe_log_sub(noise_stats->power[i], noise_stats->noise[i]);
+        snr = noise_stats->power[i] - noise_stats->noise[i];
+        log_signal = signal[i];
+#endif    
+        if (snr > lrt) {
+            lrt = snr;
+            if (log_signal > max_signal) {
+		max_signal = log_signal;
+    	    }
+    	}
+    }
+
+#ifndef FIXED_POINT
+    if (fe->remove_silence && (lrt < fe->vad_threshold || max_signal < fe->vad_threshold)) {
+#else
+    if (fe->remove_silence && (lrt < FLOAT2FIX(fe->vad_threshold) || max_signal < FLOAT2FIX(fe->vad_threshold))) {
+#endif
+        *in_speech = FALSE;
+    } else {
+	*in_speech = TRUE;
+    }
+
+    fe_lower_envelope(noise_stats, signal, noise_stats->floor, num_filts);
+
+    fe_temp_masking(noise_stats, signal, noise_stats->peak, num_filts);
+
+    if (!fe->remove_noise) {
+        //no need for further calculations if noise cancellation disabled
+        ckd_free(signal);
+        return;
+    }
+
+    for (i = 0; i < num_filts; i++) {
+        if (signal[i] < noise_stats->floor[i])
+            signal[i] = noise_stats->floor[i];
+    }
+
+    gain = (powspec_t *) ckd_calloc(num_filts, sizeof(powspec_t));
+#ifndef FIXED_POINT
+    for (i = 0; i < num_filts; i++) {
+        if (signal[i] < noise_stats->max_gain * noise_stats->power[i])
+            gain[i] = signal[i] / noise_stats->power[i];
+        else
+            gain[i] = noise_stats->max_gain;
+        if (gain[i] < noise_stats->inv_max_gain)
+            gain[i] = noise_stats->inv_max_gain;
+    }
+#else
+    for (i = 0; i < num_filts; i++) {
+        gain[i] = signal[i] - noise_stats->power[i];
+        if (gain[i] > noise_stats->max_gain)
+            gain[i] = noise_stats->max_gain;
+        if (gain[i] < noise_stats->inv_max_gain)
+            gain[i] = noise_stats->inv_max_gain;
+    }
+#endif
+
+    /* Weight smoothing and time frequency normalization */
+    fe_weight_smooth(noise_stats, mfspec, gain, num_filts);
+
+    ckd_free(gain);
+    ckd_free(signal);
+}
+
+void
+fe_vad_hangover(fe_t * fe, mfcc_t * fea, int32 is_speech)
+{
+    /* track vad state and deal with cepstrum prespeech buffer */
+    fe->vad_data->state_changed = 0;
+    if (is_speech) {
+        fe->vad_data->postspch_num = 0;
+        if (!fe->vad_data->global_state) {
+            fe->vad_data->prespch_num++;
+            fe_prespch_write_cep(fe->vad_data->prespch_buf, fea);
+            /* check for transition sil->speech */
+            if (fe->vad_data->prespch_num >= fe->prespch_len) {
+                fe->vad_data->prespch_num = 0;
+                fe->vad_data->global_state = 1;
+                /* transition silence->speech occurred */
+                fe->vad_data->state_changed = 1;
+            }
+        }
+    } else {
+        fe->vad_data->prespch_num = 0;
+        fe_prespch_reset_cep(fe->vad_data->prespch_buf);
+        if (fe->vad_data->global_state) {
+            fe->vad_data->postspch_num++;
+            /* check for transition speech->sil */
+            if (fe->vad_data->postspch_num >= fe->postspch_len) {
+                fe->vad_data->postspch_num = 0;
+                fe->vad_data->global_state = 0;
+                /* transition speech->silence occurred */
+                fe->vad_data->state_changed = 1;
+            }
+        }
+    }
+
+    if (fe->vad_data->store_pcm) {
+        if (is_speech || fe->vad_data->global_state)
+            fe_prespch_write_pcm(fe->vad_data->prespch_buf, fe->spch);
+        if (!is_speech && !fe->vad_data->global_state)
+            fe_prespch_reset_pcm(fe->vad_data->prespch_buf);
+    }
+}