Provides information to the recognizer that specifies how to process the request.
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 and required for all other audio formats. For
details, see [AudioEncoding][google.cloud.speech.v1.Recognitio
nConfig.AudioEncoding].
This needs to be set to true explicitly and
audio_channel_count > 1 to get each channel recognized
separately. The recognition result will contain a
channel_tag field to state which channel that result
belongs to. If this is not true, we will only recognize the
first channel. The request is billed cumulatively for all
channels recognized: audio_channel_count multiplied by the
length of the audio.
Optional Maximum number of recognition hypotheses to be
returned. Specifically, the maximum number of
SpeechRecognitionAlternative messages within each
SpeechRecognitionResult. The server may return fewer than
max_alternatives. Valid values are 0-30. A value
of 0 or 1 will return a maximum of one. If omitted,
will return a maximum of one.
Optional array of
SpeechContext. A means
to provide context to assist the speech recognition. For more
information, see Phrase Hints </speech-to-
text/docs/basics#phrase-hints>__.
Optional If 'true', adds punctuation to recognition result hypotheses. This feature is only available in select languages. Setting this for requests in other languages has no effect at all. The default 'false' value does not add punctuation to result hypotheses. Note: This is currently offered as an experimental service, complimentary to all users. In the future this may be exclusively available as a premium feature.
Optional Which model to select for the given request. Select the model best suited to your domain to get best results. If a model is not explicitly specified, then we auto-select a model based on the parameters in the RecognitionConfig. .. raw:: html
.. raw:: html :: .. raw:: html .. raw:: html :: .. raw:: html .. raw:: html :: .. raw:: html .. raw:: html :: .. raw:: html .. raw:: html :: .. raw:: html .. raw:: html| Model | Description |
command_and_search | Best for short queries such as voice commands or voice search. |
phone_call | Best for audio that originated from a phone call (typically recorded at an 8khz sampling rate). |
video | Best for audio that originated from from video or includes multiple speakers. Ideally the audio is recorded at a 16khz or greater sampling rate. This is a premium model that costs more than the standard rate. |
default | Best for audio that is not one of the specific audio models. For example, long-form audio. Ideally the audio is high-fidelity, recorded at a 16khz or greater sampling rate. |