public Builder clearAudio() {
      bitField0_ = (bitField0_ & ~0x00000002);
      audio_ = null;
      if (audioBuilder_ != null) {
        audioBuilder_.dispose();
        audioBuilder_ = null;
      }
      onChanged();
      return this;
    }
<pre>
Required. The audio data to be recognized.
</pre>

<code>
.google.cloud.speech.v1.RecognitionAudio audio = 2 [(.google.api.field_behavior) = REQUIRED];
</code>
java-speech/proto-google-cloud-speech-v1/src/main/java/com/google/cloud/speech/v1/RecognizeRequest.java