Alexandre Lision | 744f742 | 2013-09-25 11:39:37 -0400 | [diff] [blame] | 1 | /*********************************************************************** |
| 2 | Copyright (c) 2006-2011, Skype Limited. All rights reserved. |
| 3 | Redistribution and use in source and binary forms, with or without |
| 4 | modification, are permitted provided that the following conditions |
| 5 | are met: |
| 6 | - Redistributions of source code must retain the above copyright notice, |
| 7 | this list of conditions and the following disclaimer. |
| 8 | - Redistributions in binary form must reproduce the above copyright |
| 9 | notice, this list of conditions and the following disclaimer in the |
| 10 | documentation and/or other materials provided with the distribution. |
| 11 | - Neither the name of Internet Society, IETF or IETF Trust, nor the |
| 12 | names of specific contributors, may be used to endorse or promote |
| 13 | products derived from this software without specific prior written |
| 14 | permission. |
| 15 | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS” |
| 16 | AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 17 | IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 18 | ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| 19 | LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 20 | CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 21 | SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 22 | INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 23 | CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 24 | ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| 25 | POSSIBILITY OF SUCH DAMAGE. |
| 26 | ***********************************************************************/ |
| 27 | |
| 28 | #ifndef SILK_TUNING_PARAMETERS_H |
| 29 | #define SILK_TUNING_PARAMETERS_H |
| 30 | |
| 31 | #ifdef __cplusplus |
| 32 | extern "C" |
| 33 | { |
| 34 | #endif |
| 35 | |
| 36 | /* Decay time for bitreservoir */ |
| 37 | #define BITRESERVOIR_DECAY_TIME_MS 500 |
| 38 | |
| 39 | /*******************/ |
| 40 | /* Pitch estimator */ |
| 41 | /*******************/ |
| 42 | |
| 43 | /* Level of noise floor for whitening filter LPC analysis in pitch analysis */ |
| 44 | #define FIND_PITCH_WHITE_NOISE_FRACTION 1e-3f |
| 45 | |
| 46 | /* Bandwidth expansion for whitening filter in pitch analysis */ |
| 47 | #define FIND_PITCH_BANDWIDTH_EXPANSION 0.99f |
| 48 | |
| 49 | /*********************/ |
| 50 | /* Linear prediction */ |
| 51 | /*********************/ |
| 52 | |
| 53 | /* LPC analysis defines: regularization and bandwidth expansion */ |
| 54 | #define FIND_LPC_COND_FAC 1e-5f |
| 55 | |
| 56 | /* LTP analysis defines */ |
| 57 | #define FIND_LTP_COND_FAC 1e-5f |
| 58 | #define LTP_DAMPING 0.05f |
| 59 | #define LTP_SMOOTHING 0.1f |
| 60 | |
| 61 | /* LTP quantization settings */ |
| 62 | #define MU_LTP_QUANT_NB 0.03f |
| 63 | #define MU_LTP_QUANT_MB 0.025f |
| 64 | #define MU_LTP_QUANT_WB 0.02f |
| 65 | |
| 66 | /***********************/ |
| 67 | /* High pass filtering */ |
| 68 | /***********************/ |
| 69 | |
| 70 | /* Smoothing parameters for low end of pitch frequency range estimation */ |
| 71 | #define VARIABLE_HP_SMTH_COEF1 0.1f |
| 72 | #define VARIABLE_HP_SMTH_COEF2 0.015f |
| 73 | #define VARIABLE_HP_MAX_DELTA_FREQ 0.4f |
| 74 | |
| 75 | /* Min and max cut-off frequency values (-3 dB points) */ |
| 76 | #define VARIABLE_HP_MIN_CUTOFF_HZ 60 |
| 77 | #define VARIABLE_HP_MAX_CUTOFF_HZ 100 |
| 78 | |
| 79 | /***********/ |
| 80 | /* Various */ |
| 81 | /***********/ |
| 82 | |
| 83 | /* VAD threshold */ |
| 84 | #define SPEECH_ACTIVITY_DTX_THRES 0.05f |
| 85 | |
| 86 | /* Speech Activity LBRR enable threshold */ |
| 87 | #define LBRR_SPEECH_ACTIVITY_THRES 0.3f |
| 88 | |
| 89 | /*************************/ |
| 90 | /* Perceptual parameters */ |
| 91 | /*************************/ |
| 92 | |
| 93 | /* reduction in coding SNR during low speech activity */ |
| 94 | #define BG_SNR_DECR_dB 2.0f |
| 95 | |
| 96 | /* factor for reducing quantization noise during voiced speech */ |
| 97 | #define HARM_SNR_INCR_dB 2.0f |
| 98 | |
| 99 | /* factor for reducing quantization noise for unvoiced sparse signals */ |
| 100 | #define SPARSE_SNR_INCR_dB 2.0f |
| 101 | |
| 102 | /* threshold for sparseness measure above which to use lower quantization offset during unvoiced */ |
| 103 | #define SPARSENESS_THRESHOLD_QNT_OFFSET 0.75f |
| 104 | |
| 105 | /* warping control */ |
| 106 | #define WARPING_MULTIPLIER 0.015f |
| 107 | |
| 108 | /* fraction added to first autocorrelation value */ |
| 109 | #define SHAPE_WHITE_NOISE_FRACTION 5e-5f |
| 110 | |
| 111 | /* noise shaping filter chirp factor */ |
| 112 | #define BANDWIDTH_EXPANSION 0.95f |
| 113 | |
| 114 | /* difference between chirp factors for analysis and synthesis noise shaping filters at low bitrates */ |
| 115 | #define LOW_RATE_BANDWIDTH_EXPANSION_DELTA 0.01f |
| 116 | |
| 117 | /* extra harmonic boosting (signal shaping) at low bitrates */ |
| 118 | #define LOW_RATE_HARMONIC_BOOST 0.1f |
| 119 | |
| 120 | /* extra harmonic boosting (signal shaping) for noisy input signals */ |
| 121 | #define LOW_INPUT_QUALITY_HARMONIC_BOOST 0.1f |
| 122 | |
| 123 | /* harmonic noise shaping */ |
| 124 | #define HARMONIC_SHAPING 0.3f |
| 125 | |
| 126 | /* extra harmonic noise shaping for high bitrates or noisy input */ |
| 127 | #define HIGH_RATE_OR_LOW_QUALITY_HARMONIC_SHAPING 0.2f |
| 128 | |
| 129 | /* parameter for shaping noise towards higher frequencies */ |
| 130 | #define HP_NOISE_COEF 0.25f |
| 131 | |
| 132 | /* parameter for shaping noise even more towards higher frequencies during voiced speech */ |
| 133 | #define HARM_HP_NOISE_COEF 0.35f |
| 134 | |
| 135 | /* parameter for applying a high-pass tilt to the input signal */ |
| 136 | #define INPUT_TILT 0.05f |
| 137 | |
| 138 | /* parameter for extra high-pass tilt to the input signal at high rates */ |
| 139 | #define HIGH_RATE_INPUT_TILT 0.1f |
| 140 | |
| 141 | /* parameter for reducing noise at the very low frequencies */ |
| 142 | #define LOW_FREQ_SHAPING 4.0f |
| 143 | |
| 144 | /* less reduction of noise at the very low frequencies for signals with low SNR at low frequencies */ |
| 145 | #define LOW_QUALITY_LOW_FREQ_SHAPING_DECR 0.5f |
| 146 | |
| 147 | /* subframe smoothing coefficient for HarmBoost, HarmShapeGain, Tilt (lower -> more smoothing) */ |
| 148 | #define SUBFR_SMTH_COEF 0.4f |
| 149 | |
| 150 | /* parameters defining the R/D tradeoff in the residual quantizer */ |
| 151 | #define LAMBDA_OFFSET 1.2f |
| 152 | #define LAMBDA_SPEECH_ACT -0.2f |
| 153 | #define LAMBDA_DELAYED_DECISIONS -0.05f |
| 154 | #define LAMBDA_INPUT_QUALITY -0.1f |
| 155 | #define LAMBDA_CODING_QUALITY -0.2f |
| 156 | #define LAMBDA_QUANT_OFFSET 0.8f |
| 157 | |
| 158 | /* Compensation in bitrate calculations for 10 ms modes */ |
| 159 | #define REDUCE_BITRATE_10_MS_BPS 2200 |
| 160 | |
| 161 | /* Maximum time before allowing a bandwidth transition */ |
| 162 | #define MAX_BANDWIDTH_SWITCH_DELAY_MS 5000 |
| 163 | |
| 164 | #ifdef __cplusplus |
| 165 | } |
| 166 | #endif |
| 167 | |
| 168 | #endif /* SILK_TUNING_PARAMETERS_H */ |