class Postfil extends Ld8k
Short term postfilter : Hst(z) = Hst0(z) Hst1(z) Hst0(z) = 1/g0 A(gamma2)(z) / A(gamma1)(z) if {hi} = i.r. filter A(gamma2)/A(gamma1) (truncated) g0 = SUM(|hi|) if > 1 g0 = 1. else Hst1(z) = 1/(1+ |mu|) (1 + mu z-1) with mu = 1st parcor calculated on {hi} Long term postfilter : harmonic postfilter : H0(z) = gl * (1 + b * z-p) b = gamma_g * gain_ltp gl = 1 / 1 + b copmuation of delay on A(gamma2)(z) s(z) sub optimal research 1. search best integer delay 2. search around integer sub multiples (3 val. / sub mult) 3. search around integer with fractionnal delays (1/8)
AGC_FAC, AGC_FAC1, ALPHA, BETA, BIT_0, BIT_1, CONST12, DIM_RR, F_UP_PST, FIR_SIZE_ANA, FIR_SIZE_SYN, FLT_MAX_G729, FLT_MIN_G729, GAIN_PIT_MAX, GAMMA_G, GAMMA1_0, GAMMA1_1, GAMMA1_PST, GAMMA2_0_H, GAMMA2_0_L, GAMMA2_1, GAMMA2_PST, GAMMA3_MINUS, GAMMA3_PLUS, GAP1, GAP2, GAP3, GP0999, GPCLIP, GPCLIP2, GRID_POINTS, INV_COEF, INV_L_SUBFR, L_FRAME, L_INTER10, L_INTER4, L_INTERPOL, L_LIMIT, L_NEXT, L_SUBFR, L_SUBFRP1, L_TOTAL, L_WINDOW, LH_UP_L, LH_UP_S, LH2_L, LH2_L_P1, LH2_S, LONG_H_ST, M, M_LIMIT, MA_NP, MAX_TIME, MEAN_ENER, MEM_RES2, MIN_GPLT, MODE, MP1, MSIZE, NB_POS, NC, NC0, NC0_B, NC1, NC1_B, NCAN1, NCAN2, NCODE1, NCODE1_B, NCODE2, NCODE2_B, PI, PI04, PI92, PIT_MAX, PIT_MIN, PRM_SIZE, SERIAL_SIZE, SHARPMAX, SHARPMIN, SIZ_RES2, SIZ_TAB_HUP_L, SIZ_TAB_HUP_S, SIZ_Y_UP, SIZE_WORD, STEP, SYNC_WORD, THRESCRIT, THRESH_ERR, THRESH_H1, THRESH_H2, THRESH_L1, THRESH_L2, THRESHFCB, THRESHPIT, UP_SAMP
Constructor and Description |
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Postfil() |
Modifier and Type | Method and Description |
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(package private) void |
init_post_filter()
Initialize postfilter functions
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(package private) int |
post(int t0,
float[] signal_ptr,
int signal_ptr_offset,
float[] coeff,
int coeff_offset,
float[] sig_out,
int sig_out_offset)
Adaptive postfilter main function
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void init_post_filter()
int post(int t0, float[] signal_ptr, int signal_ptr_offset, float[] coeff, int coeff_offset, float[] sig_out, int sig_out_offset)
t0
- input : pitch delay given by codersignal_ptr
- input : input signal (pointer to current subframe)signal_ptr_offset
- input : input signal offsetcoeff
- input : LPC coefficients for current subframecoeff_offset
- input : LPC coefficients offsetsig_out
- output: postfiltered outputsig_out_offset
- input: postfiltered output offset
Jitsi, the OpenSource Java VoIP and Instant Messaging client.
Distributable under Apache license.