Package javaforce.codec.speex

Class Filters

java.lang.Object

javaforce.codec.speex.Filters

public class Filters
extends Object

Filters

Version:

$Revision$

Author:

Jim Lawrence, helloNetwork.com, Marc Gimpel, Wimba S.A. (mgimpel@horizonwimba.com)

Constructor Summary

Constructors

Constructor	Description
Filters()	Constructor.

Method Summary

Modifier and Type	Method	Description
static void	bw_lpc(float gamma, float[] lpc_in, float[] lpc_out, int order)	bw_lpc
void	comb_filter(float[] exc, int esi, float[] new_exc, int nsi, int nsf, int pitch, float[] pitch_gain, float comb_gain)	Comb Filter.
static 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
static void	filter_mem2(float[] x, int xs, float[] num, float[] den, int N, int ord, float[] mem, int ms)	filter_mem2
void	fir_mem_up(float[] x, float[] a, float[] y, int N, int M, float[] mem)	fir_mem_up
static void	fir_mem2(float[] x, int xs, float[] num, float[] y, int ys, int N, int ord, float[] mem)	fir_mem2
static void	iir_mem2(float[] x, int xs, float[] den, float[] y, int ys, int N, int ord, float[] mem)	iir_mem2
void	init()	Initialisation.
static 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.
static void	residue_percep_zero(float[] xx, int xxs, float[] ak, float[] awk1, float[] awk2, float[] y, int N, int ord)	residue_percep_zero
static void	syn_percep_zero(float[] xx, int xxs, float[] ak, float[] awk1, float[] awk2, float[] y, int N, int ord)	syn_percep_zero

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Filters

public Filters()

Constructor.

Method Details

init

public void init()

Initialisation.

bw_lpc

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

bw_lpc

Parameters:

gamma -

lpc_in -

lpc_out -

order -

filter_mem2

public static 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 -

filter_mem2

public static 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 -

iir_mem2

public static 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 -

fir_mem2

public static 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 -

syn_percep_zero

public static 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 -

residue_percep_zero

public static 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 -

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 -

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

qmf_decomp

public static 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 -