modules/audio_processing/legacy_ns/nsx_defines.h

/*
 *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef MODULES_AUDIO_PROCESSING_LEGACY_NS_NSX_DEFINES_H_
#define MODULES_AUDIO_PROCESSING_LEGACY_NS_NSX_DEFINES_H_

#define ANAL_BLOCKL_MAX 256  /* Max analysis block length */
#define HALF_ANAL_BLOCKL 129 /* Half max analysis block length + 1 */
#define NUM_HIGH_BANDS_MAX 2 /* Max number of high bands */
#define SIMULT 3
#define END_STARTUP_LONG 200
#define END_STARTUP_SHORT 50
#define FACTOR_Q16 2621440     /* 40 in Q16 */
#define FACTOR_Q7 5120         /* 40 in Q7 */
#define FACTOR_Q7_STARTUP 1024 /* 8 in Q7 */
#define WIDTH_Q8 3             /* 0.01 in Q8 (or 25 ) */

/* PARAMETERS FOR NEW METHOD */
#define DD_PR_SNR_Q11 2007         /* ~= Q11(0.98) DD update of prior SNR */
#define ONE_MINUS_DD_PR_SNR_Q11 41 /* DD update of prior SNR */
#define SPECT_FLAT_TAVG_Q14 \
  4915 /* (0.30) tavg parameter for spectral flatness measure */
#define SPECT_DIFF_TAVG_Q8 \
  77 /* (0.30) tavg parameter for spectral flatness measure */
#define PRIOR_UPDATE_Q14 1638 /* Q14(0.1) Update parameter of prior model */
#define NOISE_UPDATE_Q8 26    /* 26 ~= Q8(0.1) Update parameter for noise */

/* Probability threshold for noise state in speech/noise likelihood. */
#define ONE_MINUS_PROB_RANGE_Q8 205 /* 205 ~= Q8(0.8) */
#define HIST_PAR_EST 1000 /* Histogram size for estimation of parameters */

/* FEATURE EXTRACTION CONFIG  */
/* Bin size of histogram */
#define BIN_SIZE_LRT 10
/* Scale parameters: multiply dominant peaks of the histograms by scale factor
 * to obtain. */
/* Thresholds for prior model */
#define FACTOR_1_LRT_DIFF \
  6 /* For LRT and spectral difference (5 times bigger) */
/* For spectral_flatness: used when noise is flatter than speech (10 times
 * bigger). */
#define FACTOR_2_FLAT_Q10 922
/* Peak limit for spectral flatness (varies between 0 and 1) */
#define THRES_PEAK_FLAT 24 /* * 2 * BIN_SIZE_FLAT_FX */
/* Limit on spacing of two highest peaks in histogram: spacing determined by bin
 * size. */
#define LIM_PEAK_SPACE_FLAT_DIFF 4 /* * 2 * BIN_SIZE_DIFF_FX */
/* Limit on relevance of second peak */
#define LIM_PEAK_WEIGHT_FLAT_DIFF 2
#define THRES_FLUCT_LRT \
  10240 /* = 20 * inst->modelUpdate; fluctuation limit of LRT feat. */
/* Limit on the max and min values for the feature thresholds */
#define MAX_FLAT_Q10 38912 /*  * 2 * BIN_SIZE_FLAT_FX */
#define MIN_FLAT_Q10 4096  /*  * 2 * BIN_SIZE_FLAT_FX */
#define MAX_DIFF 100       /* * 2 * BIN_SIZE_DIFF_FX */
#define MIN_DIFF 16        /* * 2 * BIN_SIZE_DIFF_FX */
/* Criteria of weight of histogram peak  to accept/reject feature */
#define THRES_WEIGHT_FLAT_DIFF \
  154 /*(int)(0.3*(inst->modelUpdate)) for flatness and difference */

#define STAT_UPDATES 9 /* Update every 512 = 1 << 9 block */
#define ONE_MINUS_GAMMA_PAUSE_Q8 \
  13 /* ~= Q8(0.05) Update for conservative noise estimate */
#define GAMMA_NOISE_TRANS_AND_SPEECH_Q8 \
  3 /* ~= Q8(0.01) Update for transition and noise region */

#endif /* MODULES_AUDIO_PROCESSING_LEGACY_NS_NSX_DEFINES_H_ */