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      1 /*
      2  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
      3  *
      4  *  Use of this source code is governed by a BSD-style license
      5  *  that can be found in the LICENSE file in the root of the source
      6  *  tree. An additional intellectual property rights grant can be found
      7  *  in the file PATENTS.  All contributing project authors may
      8  *  be found in the AUTHORS file in the root of the source tree.
      9  */
     10 
     11 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_NS_MAIN_SOURCE_NSX_DEFINES_H_
     12 #define WEBRTC_MODULES_AUDIO_PROCESSING_NS_MAIN_SOURCE_NSX_DEFINES_H_
     13 
     14 #define ANAL_BLOCKL_MAX         256 /* Max analysis block length */
     15 #define HALF_ANAL_BLOCKL        129 /* Half max analysis block length + 1 */
     16 #define SIMULT                  3
     17 #define END_STARTUP_LONG        200
     18 #define END_STARTUP_SHORT       50
     19 #define FACTOR_Q16              2621440 /* 40 in Q16 */
     20 #define FACTOR_Q7               5120 /* 40 in Q7 */
     21 #define FACTOR_Q7_STARTUP       1024 /* 8 in Q7 */
     22 #define WIDTH_Q8                3 /* 0.01 in Q8 (or 25 ) */
     23 
     24 /* PARAMETERS FOR NEW METHOD */
     25 #define DD_PR_SNR_Q11           2007 /* ~= Q11(0.98) DD update of prior SNR */
     26 #define ONE_MINUS_DD_PR_SNR_Q11 41 /* DD update of prior SNR */
     27 #define SPECT_FLAT_TAVG_Q14     4915 /* (0.30) tavg parameter for spectral flatness measure */
     28 #define SPECT_DIFF_TAVG_Q8      77 /* (0.30) tavg parameter for spectral flatness measure */
     29 #define PRIOR_UPDATE_Q14        1638 /* Q14(0.1) Update parameter of prior model */
     30 #define NOISE_UPDATE_Q8         26 /* 26 ~= Q8(0.1) Update parameter for noise */
     31 
     32 /* Probability threshold for noise state in speech/noise likelihood. */
     33 #define ONE_MINUS_PROB_RANGE_Q8 205 /* 205 ~= Q8(0.8) */
     34 #define HIST_PAR_EST            1000 /* Histogram size for estimation of parameters */
     35 
     36 /* FEATURE EXTRACTION CONFIG  */
     37 /* Bin size of histogram */
     38 #define BIN_SIZE_LRT            10
     39 /* Scale parameters: multiply dominant peaks of the histograms by scale factor to obtain. */
     40 /* Thresholds for prior model */
     41 #define FACTOR_1_LRT_DIFF       6 /* For LRT and spectral difference (5 times bigger) */
     42 /* For spectral_flatness: used when noise is flatter than speech (10 times bigger). */
     43 #define FACTOR_2_FLAT_Q10       922
     44 /* Peak limit for spectral flatness (varies between 0 and 1) */
     45 #define THRES_PEAK_FLAT         24 /* * 2 * BIN_SIZE_FLAT_FX */
     46 /* Limit on spacing of two highest peaks in histogram: spacing determined by bin size. */
     47 #define LIM_PEAK_SPACE_FLAT_DIFF    4 /* * 2 * BIN_SIZE_DIFF_FX */
     48 /* Limit on relevance of second peak */
     49 #define LIM_PEAK_WEIGHT_FLAT_DIFF   2
     50 #define THRES_FLUCT_LRT         10240 /* = 20 * inst->modelUpdate; fluctuation limit of LRT feat. */
     51 /* Limit on the max and min values for the feature thresholds */
     52 #define MAX_FLAT_Q10            38912 /*  * 2 * BIN_SIZE_FLAT_FX */
     53 #define MIN_FLAT_Q10            4096 /*  * 2 * BIN_SIZE_FLAT_FX */
     54 #define MAX_DIFF                100 /* * 2 * BIN_SIZE_DIFF_FX */
     55 #define MIN_DIFF                16 /* * 2 * BIN_SIZE_DIFF_FX */
     56 /* Criteria of weight of histogram peak  to accept/reject feature */
     57 #define THRES_WEIGHT_FLAT_DIFF  154 /*(int)(0.3*(inst->modelUpdate)) for flatness and difference */
     58 
     59 #define STAT_UPDATES            9 /* Update every 512 = 1 << 9 block */
     60 #define ONE_MINUS_GAMMA_PAUSE_Q8    13 /* ~= Q8(0.05) Update for conservative noise estimate */
     61 #define GAMMA_NOISE_TRANS_AND_SPEECH_Q8 3 /* ~= Q8(0.01) Update for transition and noise region */
     62 
     63 #endif /* WEBRTC_MODULES_AUDIO_PROCESSING_NS_MAIN_SOURCE_NSX_DEFINES_H_ */
     64