When I cough ... How to prevent incorrect recognition in SpeechRecognitionEngine?

Question

When I load the grammar and use:

SpeechRecognitionEngine _sre = new SpeechRecognitionEngine();
...
_sre.RecognizeAsync(RecognizeMode.Multiple);

And I pout or cough or say any other word (like doh!) On the microphone, I get a false positive. For instance:

If I say to the microphone: "To!" (e.g. Homer ...)

RecognizeText: "yes" Confidence: 0.8639852

About grxml ... Weight does not work as I expected for my "WakeUpWord".

Can I add trust to my grxml file?

Is there a way to prevent false triggering with SpeechRecognitionEngine in C #?

I tried the following grammar:

<?xml version="1.0" encoding="UTF-8"?>
<grammar xmlns="http://www.w3.org/2001/06/grammar" version="1.0" root="yesOrNo">
    <rule id="yesOrNo">
      <one-of>
        <item>yes</item>
        <item>no</item>
      </one-of>
    </rule>
  </grammar>

Answer 1

. VAD ( ) ASR, yesno , , .