org.xiph.speex

Class LspQuant

java.lang.Object

org.xiph.speex.LspQuant

All Implemented Interfaces:

Codebook

Direct Known Subclasses:

HighLspQuant, LbrLspQuant, NbLspQuant

public abstract class LspQuant
extends java.lang.Object
implements Codebook

Abstract class that is the base for the various LSP Quantisation and Unquantisation methods.

Version:

$Revision: 1.2 $

Author:

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

Field Summary

Fields

Modifier and Type	Field and Description
static int	MAX_LSP_SIZE

Fields inherited from interface org.xiph.speex.Codebook

cdbk_nb, cdbk_nb_high1, cdbk_nb_high2, cdbk_nb_low1, cdbk_nb_low2, exc_10_16_table, exc_10_32_table, exc_20_32_table, exc_5_256_table, exc_5_64_table, exc_8_128_table, gain_cdbk_lbr, gain_cdbk_nb, h0, h1, hexc_10_32_table, hexc_table, high_lsp_cdbk, high_lsp_cdbk2, NB_CDBK_SIZE, NB_CDBK_SIZE_HIGH1, NB_CDBK_SIZE_HIGH2, NB_CDBK_SIZE_LOW1, NB_CDBK_SIZE_LOW2

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	LspQuant() Constructor

Method Summary

Modifier and Type	Method and Description
protected static int	lsp_quant(float[] x, int xs, int[] cdbk, int nbVec, int nbDim) LSP quantification Note: x is modified
protected static int	lsp_weight_quant(float[] x, int xs, float[] weight, int ws, int[] cdbk, int nbVec, int nbDim) LSP weighted quantification Note: x is modified
abstract void	quant(float[] lsp, float[] qlsp, int order, Bits bits) Line Spectral Pair Quantification.
protected void	unpackPlus(float[] lsp, int[] tab, Bits bits, float k, int ti, int li) Read the next 6 bits from the buffer, and using the value read and the given codebook, rebuild LSP table.
abstract void	unquant(float[] lsp, int order, Bits bits) Line Spectral Pair Unquantification.

Methods inherited from class java.lang.Object

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

Field Detail

MAX_LSP_SIZE

public static final int MAX_LSP_SIZE

See Also:

Constant Field Values

Constructor Detail

LspQuant

protected LspQuant()

Constructor

Method Detail

quant

public abstract void quant(float[] lsp,
                           float[] qlsp,
                           int order,
                           Bits bits)

Line Spectral Pair Quantification.

Parameters:

lsp - - Line Spectral Pairs table.

qlsp - - Quantified Line Spectral Pairs table.

order -

bits - - Speex bits buffer.

unquant

public abstract void unquant(float[] lsp,
                             int order,
                             Bits bits)

Line Spectral Pair Unquantification.

Parameters:

lsp - - Line Spectral Pairs table.

order -

bits - - Speex bits buffer.

unpackPlus

protected void unpackPlus(float[] lsp,
                          int[] tab,
                          Bits bits,
                          float k,
                          int ti,
                          int li)

Read the next 6 bits from the buffer, and using the value read and the given codebook, rebuild LSP table.

Parameters:

lsp -

tab -

bits - - Speex bits buffer.

k -

ti -

li -

lsp_quant

protected static int lsp_quant(float[] x,
                               int xs,
                               int[] cdbk,
                               int nbVec,
                               int nbDim)

LSP quantification Note: x is modified

Parameters:

x -

xs -

cdbk -

nbVec -

nbDim -

Returns:

the index of the best match in the codebook (NB x is also modified).

lsp_weight_quant

protected static int lsp_weight_quant(float[] x,
                                      int xs,
                                      float[] weight,
                                      int ws,
                                      int[] cdbk,
                                      int nbVec,
                                      int nbDim)

LSP weighted quantification Note: x is modified

Parameters:

x -

xs -

weight -

ws -

cdbk -

nbVec -

nbDim -

Returns:

the index of the best match in the codebook (NB x is also modified).