marytts.signalproc.analysis

Class LsfAnalyser

java.lang.Object

marytts.signalproc.analysis.LsfAnalyser

public class LsfAnalyser
extends Object

Demonstration program to accompany the subroutines described in the articles by J. Rothweiler, on computing the Line Spectral Frequencies. From http://mysite.verizon.net/vzenxj75/myown1/joe/lsf/a2lsp.c

Author:

Marc Schröder

Constructor Summary

Constructors

Constructor and Description
LsfAnalyser()

Method Summary

Methods

Modifier and Type	Method and Description
static double[]	lpc2lsf(double[] oneMinusA, int type) Convert filter coefficients to lsp coefficients.
static double[]	lpc2lsfInBark(double[] oneMinusA, int samplingRate)
static double[]	lpc2lsfInBark(double[] oneMinusA, int samplingRate, int type)
static double[]	lpc2lsfInHz(double[] oneMinusA, int samplingRate) Convert filter coefficients to lsp coefficients.
static double[]	lpc2lsfInHz(double[] oneMinusA, int samplingRate, int type)
static double[]	lsf2lpc(double[] lsf) Convert LSF frequencies into LPC coefficients.
static double[][]	lsfAnalyzeWavFile(String wavFile, LsfFileHeader params)
static void	lsfAnalyzeWavFile(String wavFileIn, String lsfFileOut, LsfFileHeader params)
static double[]	lsfInBark2lpc(double[] lsfsInBark, int samplingRate)
static double[]	lsfInHz2lpc(double[] lsf, int samplingRate) Convert LSF frequencies into LPC coefficients.
static void	main(String[] args)
static void	main2(String[] argv)
static double[]	nonPreemphasizedFrame2Lpcs(double[] nonPreemphasizedFrame, int dimension, int samplingRate, int windowType, float preCoef)
static double[]	nonPreemphasizedFrame2LsfsInHz(double[] nonPreemphasizedFrame, int dimension, int samplingRate, int windowType, float preCoef)
static double[]	preemphasizedFrame2Lpcs(double[] preemphasizedFrame, int dimension, int samplingRate, int windowType)
static double[]	preemphasizedFrame2LsfsInHz(double[] preemphasizedFrame, int dimension, int samplingRate, int windowType)
static double[][]	readLsfFile(String lsfFile)
static double[][]	readLsfs(DataInputStream stream, LsfFileHeader params)
static double[]	windowedAndPreemphasizedFrame2Lpcs(double[] windowedAndPreemphasizedFrame, int dimension, int samplingRate)
static double[]	windowedAndPreemphasizedFrame2LsfsInHz(double[] windowedAndPreemphasizedFrame, int dimension, int samplingRate)
static void	writeLsfFile(double[][] lsfs, String lsfFileOut, LsfFileHeader params)
static void	writeLsfs(DataOutputStream stream, double[][] lsfs)

Methods inherited from class java.lang.Object

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

Constructor Detail

LsfAnalyser

public LsfAnalyser()

Method Detail

lpc2lsfInHz

public static double[] lpc2lsfInHz(double[] oneMinusA,
                   int samplingRate)

Convert filter coefficients to lsp coefficients.

Parameters:

oneMinusA - A(z) = a0 - sum { ai * z^-i } . a0 = 1.

samplingRate - the sampling rate

Returns:

the lsf coefficients in the range 0 to 0.5*samplingRate, as an array of doubles of length oneMinusA.length-1.

lpc2lsfInHz

public static double[] lpc2lsfInHz(double[] oneMinusA,
                   int samplingRate,
                   int type)

lpc2lsfInBark

public static double[] lpc2lsfInBark(double[] oneMinusA,
                     int samplingRate)

lpc2lsfInBark

public static double[] lpc2lsfInBark(double[] oneMinusA,
                     int samplingRate,
                     int type)

lpc2lsf

public static double[] lpc2lsf(double[] oneMinusA,
               int type)

Convert filter coefficients to lsp coefficients.

Parameters:

oneMinusA - A(z) = a0 - sum { ai * z^-i } . a0 = 1.

type - which of the four methods for a2lsf conversion to perform

Returns:

the lsf coefficients in the range 0 to 0.5, as an array of doubles of length oneMinusA.length-1.

main2

public static void main2(String[] argv)

lsfInHz2lpc

public static double[] lsfInHz2lpc(double[] lsf,
                   int samplingRate)

Convert LSF frequencies into LPC coefficients. The analysis filter may be reconstructed: A(z) = 1/2 [ P(z) + Q(z) ]

Parameters:

lsf - the array of lsf coefficients, in Hertz frequencies

samplingRate - the sampling rate of the underlying audio data

Returns:

an array of length lsf.length+1, containing the LPC coefficients as in A(z) = a0 - sum { ai * z^-i } . a0 = 1.

lsfInBark2lpc

public static double[] lsfInBark2lpc(double[] lsfsInBark,
                     int samplingRate)

lsf2lpc

public static double[] lsf2lpc(double[] lsf)

Convert LSF frequencies into LPC coefficients. The analysis filter may be reconstructed: A(z) = 1/2 [ P(z) + Q(z) ]

Parameters:

lsf - the array of lsf coefficients, in the range 0 to 0.5

Returns:

an array of length lsf.length+1, containing the LPC coefficients as in A(z) = a0 - sum { ai * z^-i } . a0 = 1.

lsfAnalyzeWavFile

public static double[][] lsfAnalyzeWavFile(String wavFile,
                           LsfFileHeader params)
                                    throws UnsupportedAudioFileException,
                                           IOException

Throws:

UnsupportedAudioFileException

IOException

nonPreemphasizedFrame2Lpcs

public static double[] nonPreemphasizedFrame2Lpcs(double[] nonPreemphasizedFrame,
                                  int dimension,
                                  int samplingRate,
                                  int windowType,
                                  float preCoef)

preemphasizedFrame2Lpcs

public static double[] preemphasizedFrame2Lpcs(double[] preemphasizedFrame,
                               int dimension,
                               int samplingRate,
                               int windowType)

windowedAndPreemphasizedFrame2Lpcs

public static double[] windowedAndPreemphasizedFrame2Lpcs(double[] windowedAndPreemphasizedFrame,
                                          int dimension,
                                          int samplingRate)

nonPreemphasizedFrame2LsfsInHz

public static double[] nonPreemphasizedFrame2LsfsInHz(double[] nonPreemphasizedFrame,
                                      int dimension,
                                      int samplingRate,
                                      int windowType,
                                      float preCoef)

preemphasizedFrame2LsfsInHz

public static double[] preemphasizedFrame2LsfsInHz(double[] preemphasizedFrame,
                                   int dimension,
                                   int samplingRate,
                                   int windowType)

windowedAndPreemphasizedFrame2LsfsInHz

public static double[] windowedAndPreemphasizedFrame2LsfsInHz(double[] windowedAndPreemphasizedFrame,
                                              int dimension,
                                              int samplingRate)

lsfAnalyzeWavFile

public static void lsfAnalyzeWavFile(String wavFileIn,
                     String lsfFileOut,
                     LsfFileHeader params)
                              throws IOException

Throws:

IOException

writeLsfFile

public static void writeLsfFile(double[][] lsfs,
                String lsfFileOut,
                LsfFileHeader params)
                         throws IOException

Throws:

IOException

writeLsfs

public static void writeLsfs(DataOutputStream stream,
             double[][] lsfs)
                      throws IOException

Throws:

IOException

readLsfFile

public static double[][] readLsfFile(String lsfFile)
                              throws IOException

Throws:

IOException

readLsfs

public static double[][] readLsfs(DataInputStream stream,
                  LsfFileHeader params)
                           throws IOException

Throws:

IOException

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception