OkPi

Virtual assistant with offline voice recognition. Despite being primarily designed for Raspberry Pi, it should compile on any computer running Linux or macOS.

Installation

Pocket Sphinx

• The PocketSphinx installation currently requires Node.js 6
  • This can be achieved by using a version manager such as nvm:
    • nvm install 6
• Install the PocketSphinx dependencies:
  • apt-get install cmake pkg-config libpcre3-dev bison
  • swig from GitHub
  • sphinxbase from GitHub
  • pocketsphinx from GitHub
  • Note that certain tweaks might be required prior to install:
    • export PKG_CONFIG_PATH=/usr/local/lib/pkgconfig
    • ln -s /usr/bin/swig3.0 /usr/bin/swig (Create a symlink for swig3.0)
  • npm install cmake-js -g

Say.js

• Install Festival with a default voice:
  • apt-get install festival festvox-rablpc16k

NPM Dependencies

• npm install

Launching

• Make sure that this repository (OkPi) is in the same folder as the cloned pocketsphinx repository
• npm run start
  • Or alternatively using watch mode:
  • npm run watch
  • npm run launch (in a separate terminal)

Architecture

• The application roughly implements the following structure:

• Speech input

  • -> AudioInput
  • -> SpeechRecognitionEngine
  • -> UtteranceProcessor
  • -> Skill
  • -> OutputFacade