Provides "hints" to the speech recognizer to favor specificwords and phrases in the results.

A phrases containing words and phrase "hints" so that the speechrecognition is more likely to recognize them. This can be used toimprove the accuracy for specific words and phrases, for example, ifspecific commands are typically spoken by the user. This can also beused to add additional words to the vocabulary of the recognizer.Seeusagelimits <https://cloud.google.com/speech-to-text/quotas#content>__.

List items can also include pre-built or custom classes containinggroups of words that represent common concepts that occur in naturallanguage. For example, rather than providing a phrase hint for everymonth of the year (e.g. "i was born in january", "i was born infebuary", ...), use the pre-built$MONTH class improves thelikelihood of correctly transcribing audio that includes months(e.g. "i was born in $month"). To refer to pre-built classes, usethe class' symbol prepended with$ e.g.$MONTH. To refer tocustom classes that were defined inline in the request, set theclass'scustom_class_id to a string unique to all classresources and inline classes. Then use the class' id wrapped in$\{...} e.g. "${my-months}". To refer to custom classesresources, use the class' id wrapped in${} (e.g.${my-months}).

Speech-to-Text supports three locations:global,us (USNorth America), andeu (Europe). If you are calling thespeech.googleapis.com endpoint, use theglobal location. Tospecify a region, use aregionalendpoint <https://cloud.google.com/speech-to-text/docs/endpoints>__with matchingus oreu location value.