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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
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+/***********************************************************************
+Copyright (c) 2006-2011, Skype Limited. All rights reserved.
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions
+are met:
+- Redistributions of source code must retain the above copyright notice,
+this list of conditions and the following disclaimer.
+- 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.
+- Neither the name of Internet Society, IETF or IETF Trust, nor the
+names of specific contributors, may be used to endorse or promote
+products derived from this software without specific prior written
+permission.
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS 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 THE COPYRIGHT OWNER OR CONTRIBUTORS 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.
+***********************************************************************/
+
+#ifndef SILK_TUNING_PARAMETERS_H
+#define SILK_TUNING_PARAMETERS_H
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/* Decay time for bitreservoir */
+#define BITRESERVOIR_DECAY_TIME_MS 500
+
+/*******************/
+/* Pitch estimator */
+/*******************/
+
+/* Level of noise floor for whitening filter LPC analysis in pitch analysis */
+#define FIND_PITCH_WHITE_NOISE_FRACTION 1e-3f
+
+/* Bandwidth expansion for whitening filter in pitch analysis */
+#define FIND_PITCH_BANDWIDTH_EXPANSION 0.99f
+
+/*********************/
+/* Linear prediction */
+/*********************/
+
+/* LPC analysis regularization */
+#define FIND_LPC_COND_FAC 1e-5f
+
+/* LTP analysis defines */
+#define FIND_LTP_COND_FAC 1e-5f
+#define LTP_DAMPING 0.05f
+#define LTP_SMOOTHING 0.1f
+
+/* LTP quantization settings */
+#define MU_LTP_QUANT_NB 0.03f
+#define MU_LTP_QUANT_MB 0.025f
+#define MU_LTP_QUANT_WB 0.02f
+
+/* Max cumulative LTP gain */
+#define MAX_SUM_LOG_GAIN_DB 250.0f
+
+/***********************/
+/* High pass filtering */
+/***********************/
+
+/* Smoothing parameters for low end of pitch frequency range estimation */
+#define VARIABLE_HP_SMTH_COEF1 0.1f
+#define VARIABLE_HP_SMTH_COEF2 0.015f
+#define VARIABLE_HP_MAX_DELTA_FREQ 0.4f
+
+/* Min and max cut-off frequency values (-3 dB points) */
+#define VARIABLE_HP_MIN_CUTOFF_HZ 60
+#define VARIABLE_HP_MAX_CUTOFF_HZ 100
+
+/***********/
+/* Various */
+/***********/
+
+/* VAD threshold */
+#define SPEECH_ACTIVITY_DTX_THRES 0.05f
+
+/* Speech Activity LBRR enable threshold */
+#define LBRR_SPEECH_ACTIVITY_THRES 0.3f
+
+/*************************/
+/* Perceptual parameters */
+/*************************/
+
+/* reduction in coding SNR during low speech activity */
+#define BG_SNR_DECR_dB 2.0f
+
+/* factor for reducing quantization noise during voiced speech */
+#define HARM_SNR_INCR_dB 2.0f
+
+/* factor for reducing quantization noise for unvoiced sparse signals */
+#define SPARSE_SNR_INCR_dB 2.0f
+
+/* threshold for sparseness measure above which to use lower quantization offset during unvoiced */
+#define SPARSENESS_THRESHOLD_QNT_OFFSET 0.75f
+
+/* warping control */
+#define WARPING_MULTIPLIER 0.015f
+
+/* fraction added to first autocorrelation value */
+#define SHAPE_WHITE_NOISE_FRACTION 5e-5f
+
+/* noise shaping filter chirp factor */
+#define BANDWIDTH_EXPANSION 0.95f
+
+/* difference between chirp factors for analysis and synthesis noise shaping filters at low bitrates */
+#define LOW_RATE_BANDWIDTH_EXPANSION_DELTA 0.01f
+
+/* extra harmonic boosting (signal shaping) at low bitrates */
+#define LOW_RATE_HARMONIC_BOOST 0.1f
+
+/* extra harmonic boosting (signal shaping) for noisy input signals */
+#define LOW_INPUT_QUALITY_HARMONIC_BOOST 0.1f
+
+/* harmonic noise shaping */
+#define HARMONIC_SHAPING 0.3f
+
+/* extra harmonic noise shaping for high bitrates or noisy input */
+#define HIGH_RATE_OR_LOW_QUALITY_HARMONIC_SHAPING 0.2f
+
+/* parameter for shaping noise towards higher frequencies */
+#define HP_NOISE_COEF 0.25f
+
+/* parameter for shaping noise even more towards higher frequencies during voiced speech */
+#define HARM_HP_NOISE_COEF 0.35f
+
+/* parameter for applying a high-pass tilt to the input signal */
+#define INPUT_TILT 0.05f
+
+/* parameter for extra high-pass tilt to the input signal at high rates */
+#define HIGH_RATE_INPUT_TILT 0.1f
+
+/* parameter for reducing noise at the very low frequencies */
+#define LOW_FREQ_SHAPING 4.0f
+
+/* less reduction of noise at the very low frequencies for signals with low SNR at low frequencies */
+#define LOW_QUALITY_LOW_FREQ_SHAPING_DECR 0.5f
+
+/* subframe smoothing coefficient for HarmBoost, HarmShapeGain, Tilt (lower -> more smoothing) */
+#define SUBFR_SMTH_COEF 0.4f
+
+/* parameters defining the R/D tradeoff in the residual quantizer */
+#define LAMBDA_OFFSET 1.2f
+#define LAMBDA_SPEECH_ACT -0.2f
+#define LAMBDA_DELAYED_DECISIONS -0.05f
+#define LAMBDA_INPUT_QUALITY -0.1f
+#define LAMBDA_CODING_QUALITY -0.2f
+#define LAMBDA_QUANT_OFFSET 0.8f
+
+/* Compensation in bitrate calculations for 10 ms modes */
+#define REDUCE_BITRATE_10_MS_BPS 2200
+
+/* Maximum time before allowing a bandwidth transition */
+#define MAX_BANDWIDTH_SWITCH_DELAY_MS 5000
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SILK_TUNING_PARAMETERS_H */