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: 1.4 $

Author:

Jim Lawrence, helloNetwork.com, Marc Gimpel, Wimba S.A. (marc@wimba.com)

Field Summary

private float[][]	e
private float[]	gain
private int	gain_bits
private int[]	gain_cdbk
private int	pitch_bits

Constructor Summary

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

Method Summary

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
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).
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 Detail

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 Detail

Ltp3Tap

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

Constructor

Parameters:

gain_cdbk -

gain_bits -

pitch_bits -

Method Detail

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:

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