public final int getNumber() {
      if (this == UNRECOGNIZED) {
        throw new java.lang.IllegalArgumentException(
            "Can't get the number of an unknown enum value.");
      }
      return value;
    }
<pre>
This event indicates that the server has detected the end of human voice
activity in the stream. This event can be returned multiple times if
speech starts and stops repeatedly throughout the stream. This event is
only sent if `voice_activity_events` is set to true.
</pre>

<code>SPEECH_ACTIVITY_END = 3;</code>
java-speech/proto-google-cloud-speech-v2/src/main/java/com/google/cloud/speech/v2/StreamingRecognizeResponse.java