> ## Documentation Index
> The index for all IBM Cloud docs is at: https://cloud.ibm.com/docs/llms.txt
> Use these files to discover more information as needed.

# IBM Watson Speech to Text service

Use the IBM Watson Speech to Text service to transcribe spoken audio to written text. The documentation describes the Speech to Text service for IBM Cloud, IBM Cloud Pak for Data, and IBM Cloud Pak for Data as a Service.

## Get started

- [Getting started with Speech to Text](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-gettingStarted&format=markdown)
- [About Speech to Text](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-about&format=markdown)
- [Service features](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-service-features&format=markdown)
- [Data security](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-data-security&format=markdown)
- Installing
   - [Installation overview](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-speech-install-data&format=markdown)
   - [Known issues](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-known-limitations&format=markdown)
- Release notes
   - [Release notes for IBM Cloud](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-release-notes&format=markdown)
   - [Release notes for IBM Cloud Pak for Data](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-release-notes-data&format=markdown)
   - [Release notes for IBM Software Hub](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-release-notes-hub&format=markdown)
- [Demo](https://www.ibm.com/products)
- Additional resources
   - [Pricing](https://www.ibm.com/products/speech-to-text)
   - [Blogs](https://developer.ibm.com/blogs/)
   - [Webinars](https://www.ibm.com/watson)

## How to

- Using languages and models
   - [Previous-generation languages and models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models&format=markdown)
   - [Next-generation languages and models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-ng&format=markdown)
   - [Large speech languages and models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-large-speech-languages&format=markdown)
   - [Migrating to large speech models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-migrate&format=markdown)
   - [Using a model for speech recognition](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-use&format=markdown)
   - [Listing information about models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-models-list&format=markdown)
- Using audio formats
   - [Audio terminology and characteristics](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-audio-terminology&format=markdown)
   - [Supported audio formats](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-audio-formats&format=markdown)
- Recognizing speech with the service
   - [Making a speech recognition request](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-basic-request&format=markdown)
   - [Understanding speech recognition results](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-basic-response&format=markdown)
   - [The WebSocket interface](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-websockets&format=markdown)
   - [The synchronous HTTP interface](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-http&format=markdown)
   - [The asynchronous HTTP interface](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-async&format=markdown)
- Using speech recognition parameters
   - [Audio transmission and timeouts](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-input&format=markdown)
   - [Interim results and low latency](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-interim&format=markdown)
   - [Speech activity detection](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-detection&format=markdown)
   - [Speech audio parsing](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-parsing&format=markdown)
   - [Speaker labels](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-speaker-labels&format=markdown)
   - [Keyword spotting and word alternatives](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-spotting&format=markdown)
   - [Response formatting and filtering](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-formatting&format=markdown)
   - [Response metadata](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-metadata&format=markdown)
   - [Processing and audio metrics](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-metrics&format=markdown)
   - [Parameter summary](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-summary&format=markdown)
- Customizing the service
   - [Understanding customization](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-customization&format=markdown)
   - [Language support for customization](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-custom-support&format=markdown)
   - [Usage notes for customization](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-custom-usage&format=markdown)
   - Language model customization
      - [Creating a custom language model](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-languageCreate&format=markdown)
      - [Using a custom language model for speech recognition](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-languageUse&format=markdown)
      - [Working with corpora and custom words for previous-generation models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-corporaWords&format=markdown)
      - [Working with corpora and custom words for large speech models and next-generation models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-corporaWords-ng&format=markdown)
      - [Managing custom language models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-manageLanguageModels&format=markdown)
      - [Managing corpora](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-manageCorpora&format=markdown)
      - [Managing custom words](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-manageWords&format=markdown)
   - Acoustic model customization
      - [Creating a custom acoustic model](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-acoustic&format=markdown)
      - [Using a custom acoustic model for speech recognition](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-acousticUse&format=markdown)
      - [Using custom acoustic and custom language models together](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-useBoth&format=markdown)
      - [Working with audio resources](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-audioResources&format=markdown)
      - [Managing custom acoustic models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-manageAcousticModels&format=markdown)
      - [Managing audio resources](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-manageAudio&format=markdown)
   - Grammars
      - [Using grammars with custom language models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-grammars&format=markdown)
      - [Understanding grammars](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-grammarUnderstand&format=markdown)
      - [Adding a grammar to a custom language model](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-grammarAdd&format=markdown)
      - [Using a grammar for speech recognition](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-grammarUse&format=markdown)
      - [Managing grammars](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-manageGrammars&format=markdown)
      - [Example grammars](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-grammarExamples&format=markdown)
   - Custom model upgrading
      - [Upgrading custom models](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-custom-upgrade&format=markdown)
      - [Using upgraded custom models for speech recognition](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-custom-upgrade-use&format=markdown)
- Using speech for post-processing
   - [Speech transcript enrichment](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-speech-transcript-enrichment&format=markdown)
   - [Hints parameter](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-hints-parameter&format=markdown)
- Using speech for language identification
   - [Spoken language identification](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-speech-language-identification&format=markdown)
- IBM Cloud security
   - [Information security](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-information-security&format=markdown)
   - [Activity tracking events for Speech to Text](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-at_events&format=markdown)
   - [Public and private network endpoints](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-public-private-endpoints&format=markdown)
   - [Virtual Private Endpoints](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-virtual-private-endpoints&format=markdown)
- Service background
   - [The science behind the service](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-science&format=markdown)

## Reference

- [API & SDK reference](https://{DomainName}/apidocs/speech-to-text)
- [High availability and disaster recovery](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-ha-dr&format=markdown)
- [Watson SDKs](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-using-sdks&format=markdown)
- [Watson GitHub repos](https://github.com/watson-developer-cloud/)

## Help

- [Usage FAQs](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-faq-usage&format=markdown)
- [Pricing FAQs](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-faq-pricing&format=markdown)
- Developer community
   - [StackOverflow](https://stackoverflow.com/questions/tagged/ibm-watson+speech-to-text)
- [Accessibility](https://cloud.ibm.com/docs/speech-to-text?topic=speech-to-text-accessibility-platform&format=markdown)