org.xiph.speex
Class SbCodec

java.lang.Object
  org.xiph.speex.NbCodec
      org.xiph.speex.SbCodec

All Implemented Interfaces:

Codebook

Direct Known Subclasses:

SbDecoder, SbEncoder

public class SbCodec

extends NbCodec

Sideband Codec. This class contains all the basic structures needed by the Sideband encoder and decoder.

Version:

$Revision: 1.6 $

Author:

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

Field Summary

protected float	foldingGain
protected int	fullFrameSize
protected float[]	g0_mem
protected float[]	g1_mem
protected float[]	high
static int	QMF_ORDER Quadratic Mirror Filter Order
static int[]	SB_FRAME_SIZE The Sideband Frame Size gives the size in bits of a Sideband frame for a given sideband submode.
static int	SB_SUBMODE_BITS The Sideband Submodes Bits gives the number bits used to encode the Sideband Submode
static int	SB_SUBMODES The Sideband Submodes gives the number of submodes possible for the Sideband codec.
protected float[]	x0d
protected float[]	y0
protected float[]	y1

Fields inherited from class org.xiph.speex.NbCodec

awk1, awk2, awk3, bufSize, dtx_enabled, exc_gain_quant_scal1, exc_gain_quant_scal3, excBuf, excIdx, filters, first, frameSize, frmBuf, frmIdx, gamma1, gamma2, innov, interp_qlpc, interp_qlsp, lag_factor, lpc, lpc_floor, lpcSize, m_lsp, max_pitch, mem_sp, min_pitch, NB_FRAME_SIZE, NB_SUBMODE_BITS, NB_SUBMODES, nbSubframes, old_qlsp, pi_gain, pre_mem, preemph, qlsp, subframeSize, submodeID, submodes, VERY_SMALL, voc_m1, voc_m2, voc_mean, voc_offset, windowSize

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

SbCodec()

Method Summary

protected static SubMode[]	buildUwbSubModes() Build ultra-wideband submodes.
protected static SubMode[]	buildWbSubModes() Build wideband submodes.
boolean	getDtx() Returns whether or not we are using Discontinuous Transmission encoding.
float[]	getExc() Returns the excitation array.
int	getFrameSize() Returns the size of a frame (ex: 160 samples for a narrowband frame, 320 for wideband and 640 for ultra-wideband).
float[]	getInnov() Returns the innovation array.
protected void	init(int frameSize, int subframeSize, int lpcSize, int bufSize, float foldingGain) Initialisation
void	uwbinit() Ultra-wideband initialisation
void	wbinit() Wideband initialisation

Methods inherited from class org.xiph.speex.NbCodec

getPiGain, init, nbinit

Methods inherited from class java.lang.Object

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

Field Detail

SB_FRAME_SIZE

public static final int[] SB_FRAME_SIZE

The Sideband Frame Size gives the size in bits of a Sideband frame for a given sideband submode.

SB_SUBMODES

public static final int SB_SUBMODES

The Sideband Submodes gives the number of submodes possible for the Sideband codec.

See Also:

Constant Field Values

SB_SUBMODE_BITS

public static final int SB_SUBMODE_BITS

The Sideband Submodes Bits gives the number bits used to encode the Sideband Submode

See Also:

Constant Field Values

QMF_ORDER

public static final int QMF_ORDER

Quadratic Mirror Filter Order

See Also:

Constant Field Values

fullFrameSize

protected int fullFrameSize

foldingGain

protected float foldingGain

high

protected float[] high

y0

protected float[] y0

y1

protected float[] y1

x0d

protected float[] x0d

g0_mem

protected float[] g0_mem

g1_mem

protected float[] g1_mem

Constructor Detail

SbCodec

public SbCodec()

Method Detail

wbinit

public void wbinit()

Wideband initialisation

uwbinit

public void uwbinit()

Ultra-wideband initialisation

init

protected void init(int frameSize,
                    int subframeSize,
                    int lpcSize,
                    int bufSize,
                    float foldingGain)

Initialisation

Parameters:

frameSize -

subframeSize -

lpcSize -

bufSize -

foldingGain -

buildWbSubModes

protected static SubMode[] buildWbSubModes()

Build wideband submodes.

Returns:

the wideband submodes.

buildUwbSubModes

protected static SubMode[] buildUwbSubModes()

Build ultra-wideband submodes.

Returns:

the ultra-wideband submodes.

getFrameSize

public int getFrameSize()

Returns the size of a frame (ex: 160 samples for a narrowband frame, 320 for wideband and 640 for ultra-wideband).

Overrides:

getFrameSize in class NbCodec

Returns:

the size of a frame (number of audio samples in a frame).

getDtx

public boolean getDtx()

Returns whether or not we are using Discontinuous Transmission encoding.

Overrides:

getDtx in class NbCodec

Returns:

whether or not we are using Discontinuous Transmission encoding.

getExc

public float[] getExc()

Returns the excitation array.

Overrides:

getExc in class NbCodec

Returns:

the excitation array.

getInnov

public float[] getInnov()

Returns the innovation array.

Overrides:

getInnov in class NbCodec

Returns:

the innovation array.