Package org.xiph.speex

Class Ltp3Tap

java.lang.Object

org.xiph.speex.Ltp

org.xiph.speex.Ltp3Tap

public class Ltp3Tap
extends Ltp

Long Term Prediction Quantisation and Unquantisation (3Tap)

Version:

$Revision: 1.2 $

Author:

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

Field Summary

Fields

Modifier and Type	Field	Description
private float[][]	e
private float[]	gain
private int	gain_bits
private int[]	gain_cdbk
private int	pitch_bits

Constructor Summary

Constructors

Constructor	Description
Ltp3Tap(int[] gain_cdbk, int gain_bits, int pitch_bits)	Constructor

Method Summary

Modifier and Type	Method	Description
private float	pitch_gain_search_3tap(float[] target, float[] ak, float[] awk1, float[] awk2, float[] exc, int es, int pitch, int p, int nsf, Bits bits, float[] exc2, int e2s, float[] r, int[] cdbk_index)	Finds the best quantized 3-tap pitch predictor by analysis by synthesis.
final int	quant(float[] target, float[] sw, int sws, float[] ak, float[] awk1, float[] awk2, float[] exc, int es, int start, int end, float pitch_coef, int p, int nsf, Bits bits, float[] exc2, int e2s, float[] r, int complexity)	Long Term Prediction Quantification (3Tap).
final int	unquant(float[] exc, int es, int start, float pitch_coef, int nsf, float[] gain_val, Bits bits, int count_lost, int subframe_offset, float last_pitch_gain)	Long Term Prediction Unquantification (3Tap).

Methods inherited from class org.xiph.speex.Ltp

inner_prod, open_loop_nbest_pitch

Methods inherited from class java.lang.Object

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

Field Details

gain

private float[] gain

gain_cdbk

private int[] gain_cdbk

gain_bits

private int gain_bits

pitch_bits

private int pitch_bits

e

private float[][] e

Constructor Details

Ltp3Tap

public Ltp3Tap(int[] gain_cdbk,
 int gain_bits,
 int pitch_bits)

Constructor

Parameters:

gain_cdbk -

gain_bits -

pitch_bits -

Method Details

quant

public final int quant(float[] target,
 float[] sw,
 int sws,
 float[] ak,
 float[] awk1,
 float[] awk2,
 float[] exc,
 int es,
 int start,
 int end,
 float pitch_coef,
 int p,
 int nsf,
 Bits bits,
 float[] exc2,
 int e2s,
 float[] r,
 int complexity)

Long Term Prediction Quantification (3Tap).

Specified by:

quant in class Ltp

Returns:

pitch

unquant

public final int unquant(float[] exc,
 int es,
 int start,
 float pitch_coef,
 int nsf,
 float[] gain_val,
 Bits bits,
 int count_lost,
 int subframe_offset,
 float last_pitch_gain)

Long Term Prediction Unquantification (3Tap).

Specified by:

unquant in class Ltp

Parameters:

exc - - Excitation

es - - Excitation offset

start - - Smallest pitch value allowed

pitch_coef - - Voicing (pitch) coefficient

nsf - - Number of samples in subframe

gain_val -

bits - - Speex bits buffer.

count_lost -

subframe_offset -

last_pitch_gain -

Returns:

pitch

pitch_gain_search_3tap

private float pitch_gain_search_3tap(float[] target,
 float[] ak,
 float[] awk1,
 float[] awk2,
 float[] exc,
 int es,
 int pitch,
 int p,
 int nsf,
 Bits bits,
 float[] exc2,
 int e2s,
 float[] r,
 int[] cdbk_index)

Finds the best quantized 3-tap pitch predictor by analysis by synthesis.

Parameters:

target - Target vector

ak - LPCs for this subframe

awk1 - Weighted LPCs #1 for this subframe

awk2 - Weighted LPCs #2 for this subframe

exc - Excitation

es -

pitch - Pitch value

p - Number of LPC coeffs

nsf - Number of samples in subframe

bits -

exc2 -

e2s -

r -

cdbk_index -

Returns:

the best quantized 3-tap pitch predictor by analysis by synthesis.