Package org.xiph.speex

Class Ltp3Tap

  • public class Ltp3Tap
extends Ltp
    Long Term Prediction Quantisation and Unquantisation (3Tap)
    Version:
    $Revision: 1.2 $
    Author:
    Jim Lawrence, helloNetwork.com, Marc Gimpel, Wimba S.A. (mgimpel@horizonwimba.com)

    • Field Summary

      Fields 
      Modifier and Type Field Description
      private float[][] e  
      private float[] gain  
      private int gain_bits  
      private int[] gain_cdbk  
      private int pitch_bits  

    • Constructor Summary

      Constructors 
      Constructor Description
      Ltp3Tap​(int[] gain_cdbk, int gain_bits, int pitch_bits)
      Constructor

    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      private float pitch_gain_search_3tap​(float[] target, float[] ak, float[] awk1, float[] awk2, float[] exc, int es, int pitch, int p, int nsf, Bits bits, float[] exc2, int e2s, float[] r, int[] cdbk_index)
      Finds the best quantized 3-tap pitch predictor by analysis by synthesis.
      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 (3Tap).
      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 (3Tap).

      • Methods inherited from class java.lang.Object

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

    • Field Detail

      • gain

        private float[] gain

      • gain_cdbk

        private int[] gain_cdbk

      • gain_bits

        private int gain_bits

      • pitch_bits

        private int pitch_bits

      • e

        private float[][] e

    • Constructor Detail

      • Ltp3Tap

        public Ltp3Tap​(int[] gain_cdbk,
               int gain_bits,
               int pitch_bits)
        Constructor
        Parameters:
        gain_cdbk -
        gain_bits -
        pitch_bits -

    • Method Detail

      • quant

        public final 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 (3Tap).
        Specified by:
        quant in class Ltp
        Returns:
        pitch

      • unquant

        public final 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 (3Tap).
        Specified by:
        unquant in class Ltp
        Parameters:
        exc - - Excitation
        es - - Excitation offset
        start - - Smallest pitch value allowed
        pitch_coef - - Voicing (pitch) coefficient
        nsf - - Number of samples in subframe
        gain_val -
        bits - - Speex bits buffer.
        count_lost -
        subframe_offset -
        last_pitch_gain -
        Returns:
        pitch

      • pitch_gain_search_3tap

        private float pitch_gain_search_3tap​(float[] target,
                                     float[] ak,
                                     float[] awk1,
                                     float[] awk2,
                                     float[] exc,
                                     int es,
                                     int pitch,
                                     int p,
                                     int nsf,
                                     Bits bits,
                                     float[] exc2,
                                     int e2s,
                                     float[] r,
                                     int[] cdbk_index)
        Finds the best quantized 3-tap pitch predictor by analysis by synthesis.
        Parameters:
        target - Target vector
        ak - LPCs for this subframe
        awk1 - Weighted LPCs #1 for this subframe
        awk2 - Weighted LPCs #2 for this subframe
        exc - Excitation
        es -
        pitch - Pitch value
        p - Number of LPC coeffs
        nsf - Number of samples in subframe
        bits -
        exc2 -
        e2s -
        r -
        cdbk_index -
        Returns:
        the best quantized 3-tap pitch predictor by analysis by synthesis.