<div class="gmail_quote">Hi everyone, <div><div></div><div class="h5"> Sugar is becoming a useful educational tool with more and more features being introduced. Like Speech Synthesis which is the base of many sugar activities, I would like to integrate Speech Recognition into core sugar. I am presenting my features and implementation ideas and would like to know the feedback of sugar community. Intended audience With speech recognition system, we will be fulfilling the needs of two types of audience; one is the end users who are not technical and others are activity developers. End users (Non technical) For end users Speech recognition can act as a medium for controlling the sugar. Now imagine a child who is physically challenged and thus is not able to interact with systems can now open the activities (like write activity) by just saying “Open write activity”. Then he/she can simply interact with the activity with speech recognition running in the background by just saying simple commands. For example, he/she can start typing by saying “Start typing” and then speaking the words that they want to write into the document. Thus sugar will become accessible for physically challenged users which will be a boon to them. Activities can be developed around speech recognition that can help children to improve their pronunciation by incorporating oral testing. Oral testing is a method to provide feedback to the users on their pronunciation by recognizing their speech. Thus a child speaking a word “Apple” correctly should be recognized otherwise not. This is only one example and we can create numerous activities around speech recognition. This will make possible to develop more interactive activities for children that can help make sugar a useful educational tool. Activity Developers (Technical) Activity developers would be primarily interested in the API’s provided for speech recognition. We will provide simple and easy to use interfaces for the developers that will have all the control over speech recognition. The developers of already existing activities can also integrate speech recognition to make them more useful. Consider for example the write activity, we can modify it to take the inputs for typing from Speech recognition system instead of the keyboard. Implementation details For a speech recognition system, we require a Speech recognition engine that can be integrated into sugar over which we can develop the entire framework. The major requirements of such an engine are: <ul><li>1. It should be capable of running on Linux which is the core of sugar.</li><li>2. It should be open source so that we can modify it accordingly as per our needs and requirements.</li><li>3. It should not consume a lot of memory during run time.</li><li>4. It should be an efficient speech recognizer.</li></ul> One such Speech recognition engine that nearly fulfills all of these requirements is Sphinx. Sphinx is an open source speech recognition engine, developed at CMU is one of the top class speech recognizer. It has been developed primarily for Linux and comes under different versions. <a href="http://www.speech.cs.cmu.edu/" target="_blank">http://www.speech.cs.cmu.edu/</a> The currently available versions are: <ul><li>1. Sphinx 3</li> <li>2. Pocket Sphinx</li> <li>3. Sphinx 4</li> </ul> Sphinx 4 is the latest version which has been developed entirely in JAVA. Sphinx 3 and pocket sphinx are older versions but still are the famous ones. Using Sphinx 4 for integration in sugar does not seem feasible because it has been written in JAVA. So we are left with two options of either using Sphinx 3 or Pocket Sphinx. Now the decision between these two can only be made by experimenting them with sugar. This will also depend on the devices currently being aimed by sugar and thus the main focus will be on OLPC XO laptops. The XOs have 256 MB of RAM and the run time requirement of Pocket Sphinx is around 20 MB. At this time I am not sure about the requirements of Sphinx 3 but this should be more than 30 MB. Pocket Sphinx is light weight and is designed primarily for embedded devices like PDA. Sphinx 3 on the other hand is developed to run on desktops and consumes considerable amount of memory. So at least Pocket Sphinx can be implemented in sugar and the feasibility of Sphinx 3 will be tested soon. Language Support Sphinx engines require training data sets and language models for recognizing speech. Thus we can set them to recognize many languages. At present they have been tested for recognizing Chinese, Spanish, Dutch, German, Hindi, Italic, Icelandic and Russian successfully. Thus we can target a wide range of users belonging to different parts of world speaking different languages. I have collected all this data after discussion with a Sphinx developer on IRC and I am testing the Sphinx 3 and Pocket sphinx too. GUI considerations We can provide a Speech recognition button in the sugar frame (for example on Top Right hand side) which when clicked will automatically start recognizing speech in the background. Clicking the same button again will stop the recognition process. On hovering over the Speech recognition button, a sugar palette will be exposed which will display the speech recognition parameters that can be modified by the user. Sugar Controls like Sliders, Palette Buttons, and Combo boxes will be used within the palette to achieve the desired effect. A keyboard shortcut like <Alt+S> can also be provided for starting speech recognition. The corresponding hooks for the key shortcut must be made in the Sugar UI source code. I am leaving out more details that I will put up on the sugar wiki after getting the feedback from community. My little introduction J I am a computer science undergraduate student at Delhi University, New Delhi. I have always been influenced by the development at sugar and I would definitely like to contribute more into it. I have been working as a developer at SEETA (Software for Education, Entertainment and Training Activities), New Delhi, India for last 10 months. <a href="http://seeta.in/j/team.html" target="_blank">http://seeta.in/j/team.html</a> I am also the lead developer of Listen and Spell activity. <a href="http://activities.sugarlabs.org/en-US/sugar/addon/4234" target="_blank">http://activities.sugarlabs.org/en-US/sugar/addon/4234</a> Waiting for some exciting feedback from community. Regards Chirag</div> </div></div>