git.gag.com Git - debian/freetts/blob - com/sun/speech/freetts/en/PostLexicalAnalyzer.java

   1 /**
   2  * Portions Copyright 2001 Sun Microsystems, Inc.
   3  * Portions Copyright 1999-2001 Language Technologies Institute,
   4  * Carnegie Mellon University.
   5  * All Rights Reserved.  Use is subject to license terms.
   6  *
   7  * See the file "license.terms" for information on usage and
   8  * redistribution of this file, and for a DISCLAIMER OF ALL
   9  * WARRANTIES.
  10  */
  11 package com.sun.speech.freetts.en;
  12
  13 import com.sun.speech.freetts.UtteranceProcessor;
  14 import com.sun.speech.freetts.Voice;
  15 import com.sun.speech.freetts.Utterance;
  16 import com.sun.speech.freetts.Item;
  17 import com.sun.speech.freetts.Relation;
  18 import com.sun.speech.freetts.ProcessException;
  19 import com.sun.speech.freetts.PathExtractorImpl;
  20 import com.sun.speech.freetts.PathExtractor;
  21
  22
  23 /**
  24  * Annotates the utterance with post lexical information.
  25  */
  26 public class PostLexicalAnalyzer implements UtteranceProcessor {
  27     private static final PathExtractor wordPath =
  28         new PathExtractorImpl("R:SylStructure.parent.parent.name", true);
  29     private static final PathExtractor P_PH_VC =
  30         new PathExtractorImpl("p.ph_vc", true);
  31     private static final PathExtractor N_PH_VC =
  32         new PathExtractorImpl("n.ph_vc", true);
  33
  34     /**
  35      * Constructs a PostLexicalAnalyzer
  36      */
  37      public PostLexicalAnalyzer () {
  38      }
  39
  40     /**
  41      * Performs the post lexical processing.
  42      *
  43      * @param  utterance  the utterance to process
  44      *
  45      * @throws ProcessException if an error occurs while
  46      *         processing of the utterance
  47      */
  48     public void processUtterance(Utterance utterance) throws ProcessException {
  49         fixApostrophe(utterance);
  50         fixTheIy(utterance);
  51     }
  52
  53     /**
  54      * Fixes apostrophe s segments.
  55      *
  56      * @param utterance the utterance to fix
  57      */
  58     private void fixApostrophe(Utterance utterance) {
  59         Voice voice = utterance.getVoice();
  60         for (Item item = utterance.getRelation(Relation.SEGMENT).getHead();
  61                 item != null;
  62                 item = item.getNext()) {
  63             String word = wordPath.findFeature(item).toString();
  64
  65             if (word.equals("'s")) {
  66
  67                 String pname = item.getPrevious().toString();
  68
  69                 if (("fa".indexOf(
  70                             voice.getPhoneFeature(pname,"ctype")) != -1) &&
  71                     ("dbg".indexOf(
  72                             voice.getPhoneFeature(pname, "cplace")) == -1)) {
  73                     prependSchwa(item);
  74                 } else  if (voice.getPhoneFeature(pname, "cvox").equals("-")) {
  75                     item.getFeatures().setString("name", "s");
  76                 }
  77             } else if (word.equals("'ve") ||
  78                        word.equals("'ll") || word.equals("'d")) {
  79                 if ("-".equals(P_PH_VC.findFeature(item))) {
  80                     prependSchwa(item);
  81                 }
  82             }
  83         }
  84     }
  85
  86
  87     /**
  88      * Prepends a schwa to the given item
  89      *
  90      * @param item the item to prepend the schwa to.
  91      */
  92     private static void prependSchwa(Item item) {
  93         Item schwa = item.prependItem(null);
  94         schwa.getFeatures().setString("name", "ax");
  95         item.getItemAs(
  96             Relation.SYLLABLE_STRUCTURE).prependItem(schwa);
  97     }
  98
  99
 100     /**
 101      * Changes the pronunciation of "the" from 'd ax'  to 'd iy' if
 102      * the following word starts with a vowel. "The every" is a good
 103      * example.
 104      *
 105      * @param  utterance  the utterance to process
 106      */
 107     private void fixTheIy(Utterance utterance) {
 108         Voice voice = utterance.getVoice();
 109         for (Item item = utterance.getRelation(Relation.SEGMENT).getHead();
 110                 item != null; item = item.getNext()) {
 111
 112             if ("ax".equals(item.toString())) {
 113                 String word = wordPath.findFeature(item).toString();
 114                 if ("the".equals(word) &&
 115                         ("+".equals(N_PH_VC.findFeature(item)))) {
 116                     item.getFeatures().setString("name", "iy");
 117                 }
 118             }
 119         }
 120     }
 121
 122     /**
 123      * Returns the string representation of the object
 124      *
 125      * @return the string representation of the object
 126      */
 127     public String toString() {
 128         return "PostLexicalAnalyzer";
 129     }
 130 }
 131