marytts.signalproc.analysis

Class ReflectionCoefficients

java.lang.Object

marytts.signalproc.analysis.ReflectionCoefficients

public class ReflectionCoefficients
extends Object

Author:

sacha Implements the conversion between the Linear Prediction Coefficients (LPC) and the corresponding Reflection Coefficients. 24.03.2009 - Added lattice synthesis filter function (oytun.turk)

Constructor Summary

Constructors

Constructor and Description
ReflectionCoefficients()

Method Summary

Methods

Modifier and Type	Method and Description
static double[]	latticeSynthesisFilter(double[] k, double[] x)
static double[]	lpc2lprefc(double[] oneMinusA) Converts from LPC coefficients to reflection coefficients.
static double[]	lprefc2lpc(double[] k) Converts from the reflection coefficients to the corresponding LPC coefficients.

Methods inherited from class java.lang.Object

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

Constructor Detail

ReflectionCoefficients

public ReflectionCoefficients()

Method Detail

lpc2lprefc

public static double[] lpc2lprefc(double[] oneMinusA)

Converts from LPC coefficients to reflection coefficients.

Parameters:

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

Returns:

The reflection coefficents. If the LPC order is N, there are N reflection coefficients and (N+1) LPC coefficients (if you count a0==1).

lprefc2lpc

public static double[] lprefc2lpc(double[] k)

Converts from the reflection coefficients to the corresponding LPC coefficients.

Parameters:

k - the vector of p reflection coefficients [k_0 ... k_p-1].

Returns:

The LPC coefficents [1 -a_1 -a_2 ... -a_p].

latticeSynthesisFilter

public static double[] latticeSynthesisFilter(double[] k,
                              double[] x)