Voice command keyword listener in Android

Question

I would like to add voice command listener in my application.Service should listen to predefined keyword and and if keyword is spoken it should call some method.

Vo

Answer 1

You can use Pocketsphinx to accomplish this task. Check Pocketsphinx android demo for example how to listen for keyword efficiently in offline and react on the specific commands like a key phrase "oh mighty computer". The code to do that is simple:

you create a recognizer and just add keyword spotting search:

recognizer = SpeechRecognizerSetup.defaultSetup()
        .setAcousticModel(new File(modelsDir, "hmm/en-us-semi"))
        .setDictionary(new File(modelsDir, "lm/cmu07a.dic"))
        .setKeywordThreshold(1e-40f)
        .getRecognizer();

recognizer.addListener(this);
recognizer.addKeyphraseSearch("keywordSearch", "oh mighty computer");
recognizer.startListening("keywordSearch);

and define a listener:

@Override
public void onPartialResult(Hypothesis hypothesis) {
    if (hypothesis == null)
          return;
    String text = hypothesis.getHypstr();
    if (text.equals(KEYPHRASE)) {
      //  do something and restart listening
      recognizer.cancel();
      doSomething();
      recognizer.startListening("keywordSearch");
    }
} 

You can adjust keyword threshold for the best detection/false alarm match. For the ideal detection accuracy keyword should have at least 3 syllables, better 4 syllables.