Class Filters

last_pitch

private int last_pitch

last_pitch_gain

private float[] last_pitch_gain

smooth_gain

private float smooth_gain

xx

private float[] xx

Filters

public Filters()

Constructor

bw_lpc

public static final void bw_lpc(float gamma,
                                float[] lpc_in,
                                float[] lpc_out,
                                int order)

bw_lpc

Parameters:

gamma -

lpc_in -

lpc_out -

order -

comb_filter

public void comb_filter(float[] exc,
                        int esi,
                        float[] new_exc,
                        int nsi,
                        int nsf,
                        int pitch,
                        float[] pitch_gain,
                        float comb_gain)

Comb Filter

Parameters:

exc - - decoded excitation

esi -

new_exc - - enhanced excitation

nsi -

nsf - - sub-frame size

pitch - - pitch period

pitch_gain - - pitch gain (3-tap)

comb_gain - - gain of comb filter

filter_mem2

public static final void filter_mem2(float[] x,
                                     int xs,
                                     float[] num,
                                     float[] den,
                                     float[] y,
                                     int ys,
                                     int N,
                                     int ord,
                                     float[] mem,
                                     int ms)

filter_mem2

Parameters:

x -

xs -

num -

den -

y -

ys -

N -

ord -

mem -

ms -

filter_mem2

public static final void filter_mem2(float[] x,
                                     int xs,
                                     float[] num,
                                     float[] den,
                                     int N,
                                     int ord,
                                     float[] mem,
                                     int ms)

filter_mem2

Parameters:

x -

xs -

num -

den -

N -

ord -

mem -

ms -

fir_mem2

public static final void fir_mem2(float[] x,
                                  int xs,
                                  float[] num,
                                  float[] y,
                                  int ys,
                                  int N,
                                  int ord,
                                  float[] mem)

fir_mem2

Parameters:

x -

xs -

num -

y -

ys -

N -

ord -

mem -

fir_mem_up

public void fir_mem_up(float[] x,
                       float[] a,
                       float[] y,
                       int N,
                       int M,
                       float[] mem)

fir_mem_up

Parameters:

x -

a -

y -

N -

M -

mem -

iir_mem2

public static final void iir_mem2(float[] x,
                                  int xs,
                                  float[] den,
                                  float[] y,
                                  int ys,
                                  int N,
                                  int ord,
                                  float[] mem)

iir_mem2

Parameters:

x -

xs -

den -

y -

ys -

N -

ord -

mem -

init

public void init()

Initialisation

qmf_decomp

public static final void qmf_decomp(float[] xx,
                                    float[] aa,
                                    float[] y1,
                                    float[] y2,
                                    int N,
                                    int M,
                                    float[] mem)

Quadrature Mirror Filter to Split the band in two. A 16kHz signal is thus divided into two 8kHz signals representing the low and high bands. (used by wideband encoder)

Parameters:

xx -

aa -

y1 -

y2 -

N -

M -

mem -

residue_percep_zero

public static final void residue_percep_zero(float[] xx,
                                             int xxs,
                                             float[] ak,
                                             float[] awk1,
                                             float[] awk2,
                                             float[] y,
                                             int N,
                                             int ord)

residue_percep_zero

Parameters:

xx -

xxs -

ak -

awk1 -

awk2 -

y -

N -

ord -

syn_percep_zero

public static final void syn_percep_zero(float[] xx,
                                         int xxs,
                                         float[] ak,
                                         float[] awk1,
                                         float[] awk2,
                                         float[] y,
                                         int N,
                                         int ord)

syn_percep_zero

Parameters:

xx -

xxs -

ak -

awk1 -

awk2 -

y -

N -

ord -