In-vehicle/IVIHome Guide

Revision as of 10:26, 22 March 2011

MeeGo IVI provides a "IVIHome" application that is the default MeeGo IVI homescreen when the system boots. This section provides information about the design and use of the MeeGo "IVIHome" screen and taskbar.

IVIHome Design Objectives

The primary objectives in designing the IVI Home Screen were:

1. Provide a sample taskbar that utilizes a scrollwheel, Text to Speech and Speech Recognition so that it can be operated without distracting driver by requiring them to look at the display or a keyboard. During system development the IVIHome and taskbar application may still be operated via touchscreen or mouse.
2. Provide an "automotive" look and feel with a rounded taskbar to reflect the scrollwheel use and the ability to switch the taskbar from left side to right side of the display, presuming the display is in the automotive center console and the steering wheel could be on the left or right.

IVIHome Use

Navigating the IVIHome taskbar may be done via touchscreen, scrollwheel, and Speech Recognition of voice commands with the help of Text to Speech (TTS).

Touchscreen support

• IVIHome has full touchscreen support for platforms with working touchscreen hardware and drivers
• IVIHome can also be navigated using a mouse and the user can use the mouse wheel to scroll through the menu.

Scrollwheel Support

• Currently only the Contour ShuttleXpress is supported since the key mapping is hard-coded.
• Currently only the IVIHome screen and taskbar support the ShuttleXpress. The application support has not been implemented yet.
• The ShuttleXpress controller has 5 dedicated mouse buttons and knob that turns left/right, all of these buttons simulate key presses on a hardware button in a car and currently only works when you are at the IVIHome screen, they are not yet supported in any of the applications.
• Just plug in the ShuttleXpress and it will recognize the device automatically (may have to reboot the system or restart by “pkill ivihome”)
• The buttons are mapped to the following functions:
  • Button1 – BACK, this takes you back to the previous menu or closes the menu completely.
  • Button2 – HOME, this will always open up the navigation menu if the menu is closed, or return you back to the home menu if you are in a sub menu.
  • Button3 – SELECT/OPEN, this will open the highlighted menu or application, it is the same as clicking on the application.
  • Knob Left – UP, use this to navigate through the menu in UP direction.
  • Knob Right – DOWN, use this to navigate through the menu in DOWN direction.

Text-to-Speech(TTS)

• Supported by IVIHome menu navigation
• When you navigate the scroll menu list, it will use Festival to say the current menu item, you should hear “Navigation, Communication”, etc as you browse through the menu.
• Text to speech is turned on by default, however, if you use TTS with speech recognition on a system with a mic too close to the speakers, they might interfere.
• You can turn TTS on/off by editing the configuration file in /usr/share/ivihome/settings.xml and change <texttospeech>on<texttospeech> to off, then restart ivihome by executing “pkill ivihome”

Speech recognition (IVIHome menu voice commands)

• Speech recognition is supported by IVIHome. Speech recognition in applications needs to be added.
• IVIHome speech recognition does not support continuous speech, it only recognizes voice commands for the IVIhome menu as shown below
• To turn on speech recognition, click on the microphone icon on the taskbar, to turn it off, click again.
• The following tables list the supported voice commands (you can also look in /usr/share/ivihome/data/ivihome.jsgf):

Menu Navigation Commands

Named Category and Application Commands

You can directly name any Catagory listed in the Root Menu or specific applications shown in each Catagory Menu.

Application commands

Voice commands may be used to skip menu navigation and go directly to specific applications

The list of applications for each of the above application commands are defined in the /usr/share/ivihome/settings.xml file. You can edit this file to change the application that is launched by the voice commands. You cannot change the vocabulary list directly, it needs to be re-generated. If you want to add more voice commands, you’ll have to add the command in the dictionary and re-generate the language model (grammar) and dictionary and implement the logic in the application.