public Builder clearSampleRateHertz() {
      bitField0_ = (bitField0_ & ~0x00000002);
      sampleRateHertz_ = 0;
      onChanged();
      return this;
    }
<pre>
Sample rate in Hertz of the audio data sent in all
`RecognitionAudio` messages. Valid values are: 8000-48000.
16000 is optimal. For best results, set the sampling rate of the audio
source to 16000 Hz. If that's not possible, use the native sample rate of
the audio source (instead of re-sampling).
This field is optional for FLAC and WAV audio files, but is
required for all other audio formats. For details, see
[AudioEncoding][google.cloud.speech.v1p1beta1.RecognitionConfig.AudioEncoding].
</pre>

<code>int32 sample_rate_hertz = 2;</code>

@return This builder for chaining.
java-speech/proto-google-cloud-speech-v1p1beta1/src/main/java/com/google/cloud/speech/v1p1beta1/RecognitionConfig.java