The document provides steps for building a text-to-speech app using the IBM Watson API: 1) Sign up for IBM Bluemix and create a Text-to-Speech API service; 2) Get API credentials and test calls using CURL or Hurl.it; 3) Deploy a starter app from GitHub to Bluemix, adding the API credentials; and 4) Edit code and HTML, and deploy the app to Bluemix.

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Colin McCabe
@beekman33
IBM North America Cloud Technical Evangelist
IBM BootcampBuilding an app with a Watson API: Text to Speech Deep Dive

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Introduction
1) Today we will take an up close look at the
Text-to-Speech Watson API
2) Build your own
Speech Synthesis App in Bluemix

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Introduction
The Science Behind Text to Speech
The 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 Create
Sign-up
For Bluemix
API
Access
Build an
App
Edit and
Control
Launch
1 2 3 4 5

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Sign-up for Bluemix
Sign-up
For Bluemix
1. Bluemix.net
Top Right > Sign Up

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Dashboard – Select API
2. 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)

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5. Get your Service Credentials

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

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CURL CHEATSHEET
https://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 – GitHub
Sign-up
For Bluemix
API
Access
Build an
App
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 Git
11. Add GIT to prepare you DevOps tools

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Using Bluemix
Sign-up
For Bluemix
API
Access
Build an
App
Edit and
Control
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 / MOBILE
Sign-up
For Bluemix
API
Access
Build an
App
Edit and
Control
Launch
14. Manage Organization / Domains
15. 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-up
Sign-up
For Bluemix
API
Access
Build an
App
Edit and
Control
Launch
• Registration
• Dashboard &
Catalog
• Select Text to
Speech API
• Create API
Service
• Get Service
Credentials
• Test API with
CURL
• 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-service
name: <application-name>
command: node app.js
path: .
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-service
Push it live!
$ cf push
Command Line Option

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Thanks
Colin McCabe
@beekman33
IBM North America Cloud Technical Evangelist