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Colin McCabe@beekman33IBM North America Cloud Technical Evangelist

IBM BootcampBuilding an app with a Watson API: Text to Speech Deep Dive

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Introduction1) Today we will take an up close look at the Text-to-Speech Watson API2) Build your own Speech Synthesis App in Bluemix

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IntroductionThe Science Behind Text to SpeechThe Text to Speech service relies on acoustic models based on decision trees. The models generate acoustic candidates to perform searches based on contextual features of the text. The system uses time-domain Pitch Synchronous Overlap and Add (PSOLA) - It can modify the pitch and duration of a speech signal. The service uses a text-processing front-end to parse the text before synthesizing it into audio form.

Based on research papers:•Database Mining for Flexible Concatenative Text-to-Speech•Automatic Exploration of Corpus-Specific Properties •Evaluation of the IBM Expressive Text-to-Speech Synthesis System •The IBM Submission to the 2008 Text-to-Speech Blizzard Challenge •The IBM expressive text-to-speech synthesis system for American English• Frequency warping based on mapping formant parameters.

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Let’s CreateSign-up For Bluemix

API Access

Build anApp

Edit andControl Launch

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Sign-up for BluemixSign-up For Bluemix

1. Bluemix.netTop Right > Sign Up

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Dashboard – Select API2. Click Catalog at the Top

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3. Select Text to Speech

Sign-up For Bluemix

API Access

API Access

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4. Create The API Service (and your credentials)

95. Get your Service Credentials

106. Copy and Paste username and password (Sticky!)

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CURL CHEATSHEEThttps://goo.gl/or7e4S

7. Test out some calls

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HURL.IT

8. Windows users can try Hurl.it to test API

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Starter App – GitHubSign-up For Bluemix

API Access

Build anApp

https://github.com/watson-developer-cloud/text-to-speech-nodejs

9. Google watson developer text to speech nodejs

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Deploy to Bluemix

10. Name your app

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Add Git11. Add GIT to prepare you DevOps tools

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Using BluemixSign-up For Bluemix

API Access

Build anApp

Edit andControl

12. Click Edit Code

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WEB IDE

13. Update your API credentials (app.js) and modify HTML (index.html)

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DOMAINS / MOBILESign-up For Bluemix

API Access

Build anApp

Edit andControl Launch

14. Manage Organization / Domains15. Try it on Mobile / Download VLC to play OGG

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Done!Congratulations, you’ve used the Watson API: Text to Speech, and built your own app.

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Wrap-upSign-up For Bluemix

API Access

Build anApp

Edit andControl Launch

• Registration• Dashboard &

Catalog

• Select Text toSpeech API

• Create API Service

• Get ServiceCredentials

• Test API withCURL

• GitHub Starter• Name App• Add Git

(DevOps)

• Edit Code• Add API

Credentials• Manipulate

HTML

• Mobile• Domain

Name

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Edit the manifest.yml file and change the <application-name> to something unique.applications:- services:- text-to-speech-servicename: <application-name>command: node app.jspath: .memory: 256M

The name you use will determinate your application url initially, e.g. <application-name>.mybluemix.net.Connect to Bluemix in the command line tool.$ cf api https://api.ng.bluemix.net$ cf login -u <your user ID>Create the Text to Speech service in Bluemix.$ cf create-service text_to_speech standard text-to-speech-servicePush it live!$ cf push

Command Line Option

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Thanks

Colin McCabe@beekman33IBM North America Cloud Technical Evangelist