freeswitch/libs/silk/src/SKP_Silk_tables_other.c

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#include "SKP_Silk_structs.h"
#include "SKP_Silk_define.h"
#include "SKP_Silk_tables.h"
#ifdef __cplusplus
extern "C"
{
#endif

/* Piece-wise linear mapping from bitrate in kbps to coding quality in dB SNR */
const SKP_int32 TargetRate_table_NB[ TARGET_RATE_TAB_SZ ] = {
    0,      8000,   9000,   11000,  13000,  16000,  22000,  MAX_TARGET_RATE_BPS
};
const SKP_int32 TargetRate_table_MB[ TARGET_RATE_TAB_SZ ] = {
    0,      10000,  12000,  14000,  17000,  21000,  28000,  MAX_TARGET_RATE_BPS
};
const SKP_int32 TargetRate_table_WB[ TARGET_RATE_TAB_SZ ] = {
    0,      11000,  14000,  17000,  21000,  26000,  36000,  MAX_TARGET_RATE_BPS
};
const SKP_int32 TargetRate_table_SWB[ TARGET_RATE_TAB_SZ ] = {
    0,      13000,  16000,  19000,  25000,  32000,  46000,  MAX_TARGET_RATE_BPS
};
const SKP_int32 SNR_table_Q1[ TARGET_RATE_TAB_SZ ] = {
    19,     31,     35,     39,     43,     47,     54,     64
};

const SKP_int32 SNR_table_one_bit_per_sample_Q7[ 4 ] = {
    1984,   2240,   2408,   2708
};

/* Filter coeficicnts for HP filter: 4. Order filter implementad as two biquad filters  */
const SKP_int16 SKP_Silk_SWB_detect_B_HP_Q13[ NB_SOS ][ 3 ] = {
    //{400, -550, 400}, {400, 130, 400}, {400, 390, 400}
    {575, -948, 575}, {575, -221, 575}, {575, 104, 575} 
};
const SKP_int16 SKP_Silk_SWB_detect_A_HP_Q13[ NB_SOS ][ 2 ] = {
    {14613, 6868}, {12883, 7337}, {11586, 7911}
    //{14880, 6900}, {14400, 7300}, {13700, 7800}
};

/* Decoder high-pass filter coefficients for 24 kHz sampling, -6 dB @ 44 Hz */
const SKP_int16 SKP_Silk_Dec_A_HP_24[ DEC_HP_ORDER     ] = {-16220, 8030};              // second order AR coefs, Q13
const SKP_int16 SKP_Silk_Dec_B_HP_24[ DEC_HP_ORDER + 1 ] = {8000, -16000, 8000};        // second order MA coefs, Q13

/* Decoder high-pass filter coefficients for 16 kHz sampling, - 6 dB @ 46 Hz */
const SKP_int16 SKP_Silk_Dec_A_HP_16[ DEC_HP_ORDER     ] = {-16127, 7940};              // second order AR coefs, Q13
const SKP_int16 SKP_Silk_Dec_B_HP_16[ DEC_HP_ORDER + 1 ] = {8000, -16000, 8000};        // second order MA coefs, Q13

/* Decoder high-pass filter coefficients for 12 kHz sampling, -6 dB @ 44 Hz */
const SKP_int16 SKP_Silk_Dec_A_HP_12[ DEC_HP_ORDER     ] = {-16043, 7859};              // second order AR coefs, Q13
const SKP_int16 SKP_Silk_Dec_B_HP_12[ DEC_HP_ORDER + 1 ] = {8000, -16000, 8000};        // second order MA coefs, Q13

/* Decoder high-pass filter coefficients for 8 kHz sampling, -6 dB @ 43 Hz */
const SKP_int16 SKP_Silk_Dec_A_HP_8[ DEC_HP_ORDER     ] = {-15885, 7710};               // second order AR coefs, Q13
const SKP_int16 SKP_Silk_Dec_B_HP_8[ DEC_HP_ORDER + 1 ] = {8000, -16000, 8000};         // second order MA coefs, Q13

/* table for LSB coding */
const SKP_uint16 SKP_Silk_lsb_CDF[ 3 ] = {0,  40000,  65535};

/* tables for LTPScale */
const SKP_uint16 SKP_Silk_LTPscale_CDF[ 4 ] = {0,  32000,  48000,  65535};
const SKP_int    SKP_Silk_LTPscale_offset   = 2;

/* tables for VAD flag */
const SKP_uint16 SKP_Silk_vadflag_CDF[ 3 ] = {0,  22000,  65535}; // 66% for speech, 33% for no speech
const SKP_int    SKP_Silk_vadflag_offset   = 1;

/* tables for sampling rate */
const SKP_int    SKP_Silk_SamplingRates_table[ 4 ] = {8, 12, 16, 24};
const SKP_uint16 SKP_Silk_SamplingRates_CDF[ 5 ]   = {0,  16000,  32000,  48000,  65535};
const SKP_int    SKP_Silk_SamplingRates_offset     = 2;

/* tables for NLSF interpolation factor */
const SKP_uint16 SKP_Silk_NLSF_interpolation_factor_CDF[ 6 ] = {0,   3706,   8703,  19226,  30926,  65535};
const SKP_int    SKP_Silk_NLSF_interpolation_factor_offset   = 4;

/* Table for frame termination indication */
const SKP_uint16 SKP_Silk_FrameTermination_CDF[ 5 ] = {0, 20000, 45000, 56000, 65535};
const SKP_int    SKP_Silk_FrameTermination_offset   = 2;

/* Table for random seed */
const SKP_uint16 SKP_Silk_Seed_CDF[ 5 ] = {0, 16384, 32768, 49152, 65535};
const SKP_int    SKP_Silk_Seed_offset   = 2;

/* Quantization offsets */
const SKP_int16  SKP_Silk_Quantization_Offsets_Q10[ 2 ][ 2 ] = {
    { OFFSET_VL_Q10, OFFSET_VH_Q10 }, { OFFSET_UVL_Q10, OFFSET_UVH_Q10 }
};

/* Table for LTPScale */
const SKP_int16 SKP_Silk_LTPScales_table_Q14[ 3 ] = { 15565, 11469, 8192 };

#if SWITCH_TRANSITION_FILTERING
/*  Elliptic/Cauer filters designed with 0.1 dB passband ripple, 
        80 dB minimum stopband attenuation, and
        [0.95 : 0.15 : 0.35] normalized cut off frequencies. */

/* Interpolation points for filter coefficients used in the bandwidth transition smoother */
const SKP_int32 SKP_Silk_Transition_LP_B_Q28[ TRANSITION_INT_NUM ][ TRANSITION_NB ] = 
{
{    250767114,  501534038,  250767114  },
{    209867381,  419732057,  209867381  },
{    170987846,  341967853,  170987846  },
{    131531482,  263046905,  131531482  },
{     89306658,  178584282,   89306658  }
};

/* Interpolation points for filter coefficients used in the bandwidth transition smoother */
const SKP_int32 SKP_Silk_Transition_LP_A_Q28[ TRANSITION_INT_NUM ][ TRANSITION_NA ] = 
{
{    506393414,  239854379  },
{    411067935,  169683996  },
{    306733530,  116694253  },
{    185807084,   77959395  },
{     35497197,   57401098  }
};
#endif

#ifdef __cplusplus
}
#endif