Instructs the speech recognizer how to process the audio
content.
Required. Sample rate (in Hertz) of the audio content sent in
the query. Refer to Cloud Speech API documentation
<https://cloud.google.com/speech-to-text/docs/basics>__ for
more details.
If true, Dialogflow returns
SpeechWordInfo in
[StreamingRecognitionResult][google.cloud.dialogflow.v2.Stream
ingRecognitionResult] with information about the recognized
speech words, e.g. start and end time offsets. If false or
unspecified, Speech doesn't return any word-level information.
Context information to assist speech recognition. See the
Cloud Speech documentation <https://cloud.google.com/speech-
to-text/docs/basics#phrase-hints>__ for more details.
Which variant of the [Speech
model][google.cloud.dialogflow.v2.InputAudioConfig.model] to
use.
