155 lines
6 KiB
C
155 lines
6 KiB
C
/***********************************************************************
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Copyright (c) 2006-2011, Skype Limited. All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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- Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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- Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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- Neither the name of Internet Society, IETF or IETF Trust, nor the
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names of specific contributors, may be used to endorse or promote
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products derived from this software without specific prior written
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permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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***********************************************************************/
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#ifndef SILK_TUNING_PARAMETERS_H
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#define SILK_TUNING_PARAMETERS_H
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/* Decay time for bitreservoir */
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#define BITRESERVOIR_DECAY_TIME_MS 500
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/*******************/
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/* Pitch estimator */
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/*******************/
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/* Level of noise floor for whitening filter LPC analysis in pitch analysis */
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#define FIND_PITCH_WHITE_NOISE_FRACTION 1e-3f
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/* Bandwidth expansion for whitening filter in pitch analysis */
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#define FIND_PITCH_BANDWIDTH_EXPANSION 0.99f
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/*********************/
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/* Linear prediction */
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/*********************/
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/* LPC analysis regularization */
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#define FIND_LPC_COND_FAC 1e-5f
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/* Max cumulative LTP gain */
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#define MAX_SUM_LOG_GAIN_DB 250.0f
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/* LTP analysis defines */
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#define LTP_CORR_INV_MAX 0.03f
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/***********************/
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/* High pass filtering */
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/***********************/
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/* Smoothing parameters for low end of pitch frequency range estimation */
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#define VARIABLE_HP_SMTH_COEF1 0.1f
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#define VARIABLE_HP_SMTH_COEF2 0.015f
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#define VARIABLE_HP_MAX_DELTA_FREQ 0.4f
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/* Min and max cut-off frequency values (-3 dB points) */
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#define VARIABLE_HP_MIN_CUTOFF_HZ 60
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#define VARIABLE_HP_MAX_CUTOFF_HZ 100
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/***********/
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/* Various */
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/***********/
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/* VAD threshold */
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#define SPEECH_ACTIVITY_DTX_THRES 0.05f
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/* Speech Activity LBRR enable threshold */
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#define LBRR_SPEECH_ACTIVITY_THRES 0.3f
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/*************************/
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/* Perceptual parameters */
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/*************************/
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/* reduction in coding SNR during low speech activity */
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#define BG_SNR_DECR_dB 2.0f
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/* factor for reducing quantization noise during voiced speech */
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#define HARM_SNR_INCR_dB 2.0f
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/* factor for reducing quantization noise for unvoiced sparse signals */
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#define SPARSE_SNR_INCR_dB 2.0f
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/* threshold for sparseness measure above which to use lower quantization offset during unvoiced */
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#define ENERGY_VARIATION_THRESHOLD_QNT_OFFSET 0.6f
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/* warping control */
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#define WARPING_MULTIPLIER 0.015f
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/* fraction added to first autocorrelation value */
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#define SHAPE_WHITE_NOISE_FRACTION 3e-5f
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/* noise shaping filter chirp factor */
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#define BANDWIDTH_EXPANSION 0.94f
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/* harmonic noise shaping */
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#define HARMONIC_SHAPING 0.3f
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/* extra harmonic noise shaping for high bitrates or noisy input */
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#define HIGH_RATE_OR_LOW_QUALITY_HARMONIC_SHAPING 0.2f
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/* parameter for shaping noise towards higher frequencies */
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#define HP_NOISE_COEF 0.25f
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/* parameter for shaping noise even more towards higher frequencies during voiced speech */
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#define HARM_HP_NOISE_COEF 0.35f
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/* parameter for applying a high-pass tilt to the input signal */
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#define INPUT_TILT 0.05f
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/* parameter for extra high-pass tilt to the input signal at high rates */
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#define HIGH_RATE_INPUT_TILT 0.1f
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/* parameter for reducing noise at the very low frequencies */
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#define LOW_FREQ_SHAPING 4.0f
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/* less reduction of noise at the very low frequencies for signals with low SNR at low frequencies */
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#define LOW_QUALITY_LOW_FREQ_SHAPING_DECR 0.5f
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/* subframe smoothing coefficient for HarmBoost, HarmShapeGain, Tilt (lower -> more smoothing) */
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#define SUBFR_SMTH_COEF 0.4f
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/* parameters defining the R/D tradeoff in the residual quantizer */
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#define LAMBDA_OFFSET 1.2f
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#define LAMBDA_SPEECH_ACT -0.2f
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#define LAMBDA_DELAYED_DECISIONS -0.05f
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#define LAMBDA_INPUT_QUALITY -0.1f
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#define LAMBDA_CODING_QUALITY -0.2f
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#define LAMBDA_QUANT_OFFSET 0.8f
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/* Compensation in bitrate calculations for 10 ms modes */
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#define REDUCE_BITRATE_10_MS_BPS 2200
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/* Maximum time before allowing a bandwidth transition */
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#define MAX_BANDWIDTH_SWITCH_DELAY_MS 5000
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#ifdef __cplusplus
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}
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#endif
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#endif /* SILK_TUNING_PARAMETERS_H */
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