Package org.xiph.speex
Class Ltp
java.lang.Object
org.xiph.speex.Ltp
- Direct Known Subclasses:
Ltp3Tap
,LtpForcedPitch
Abstract class that is the base for the various LTP (Long Term Prediction)
Quantisation and Unquantisation methods.
- Version:
- $Revision: 1.2 $
- Author:
- Jim Lawrence, helloNetwork.com, Marc Gimpel, Wimba S.A. (mgimpel@horizonwimba.com)
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionprotected static float
inner_prod
(float[] x, int xs, float[] y, int ys, int len) Calculates the inner product of the given vectors.protected static void
open_loop_nbest_pitch
(float[] sw, int swIdx, int start, int end, int len, int[] pitch, float[] gain, int N) Find the n-best pitch in Open Loop.abstract 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.abstract 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.
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Constructor Details
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Ltp
public Ltp()
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Method Details
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quant
public abstract 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.- Returns:
- pitch
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unquant
public abstract 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.- Parameters:
exc
- - Excitationes
- - Excitation offsetstart
- - Smallest pitch value allowedpitch_coef
- - Voicing (pitch) coefficientnsf
- - Number of samples in subframegain_val
-bits
- - Speex bits buffer.count_lost
-subframe_offset
-last_pitch_gain
-- Returns:
- pitch
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inner_prod
protected static float inner_prod(float[] x, int xs, float[] y, int ys, int len) Calculates the inner product of the given vectors.- Parameters:
x
- - first vector.xs
- - offset of the first vector.y
- - second vector.ys
- - offset of the second vector.len
- - length of the vectors.- Returns:
- the inner product of the given vectors.
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open_loop_nbest_pitch
protected static void open_loop_nbest_pitch(float[] sw, int swIdx, int start, int end, int len, int[] pitch, float[] gain, int N) Find the n-best pitch in Open Loop.- Parameters:
sw
-swIdx
-start
-end
-len
-pitch
-gain
-N
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