Class Lsp

java.lang.Object
javaforce.codec.speex.Lsp
public class Lsp extends Object
Line Spectral Pair
Version:
$Revision$
Author:
Jim Lawrence, helloNetwork.com, Marc Gimpel, Wimba S.A. (mgimpel@horizonwimba.com)

  • Constructor Summary

    Constructors
    Constructor
    Description
    Lsp()
    Constructor

  • Method Summary

    Modifier and Type
    Method
    Description
    static float
    cheb_poly_eva(float[] coef, float x, int m)
    This function evaluates a series of Chebyshev polynomials.
    static void
    enforce_margin(float[] lsp, int len, float margin)
    Makes sure the LSPs are stable.
    static int
    lpc2lsp(float[] a, int lpcrdr, float[] freq, int nb, float delta)
    This function converts LPC coefficients to LSP coefficients.
    void
    lsp2lpc(float[] freq, float[] ak, int lpcrdr)
    Line Spectral Pair to Linear Prediction Coefficients

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • Lsp

      public Lsp()
      Constructor

  • Method Details

    • cheb_poly_eva

      public static float cheb_poly_eva(float[] coef, float x, int m)
      This function evaluates a series of Chebyshev polynomials.
      Parameters:
      coef - - coefficients of the polynomial to be evaluated.
      x - - the point where polynomial is to be evaluated.
      m - - order of the polynomial.
      Returns:
      the value of the polynomial at point x.

    • lpc2lsp

      public static int lpc2lsp(float[] a, int lpcrdr, float[] freq, int nb, float delta)
      This function converts LPC coefficients to LSP coefficients.
      Parameters:
      a - - LPC coefficients.
      lpcrdr - - order of LPC coefficients (10).
      freq - - LSP frequencies in the x domain.
      nb - - number of sub-intervals (4).
      delta - - grid spacing interval (0.02).
      Returns:
      the number of roots (the LSP coefs are returned in the array).

    • lsp2lpc

      public void lsp2lpc(float[] freq, float[] ak, int lpcrdr)
      Line Spectral Pair to Linear Prediction Coefficients
      Parameters:
      freq -
      ak -
      lpcrdr -

    • enforce_margin

      public static void enforce_margin(float[] lsp, int len, float margin)
      Makes sure the LSPs are stable.
      Parameters:
      lsp -
      len -
      margin -