<?xml version="1.0" encoding="utf-8"?>

<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->

<!-- This component and the accompanying materials are made available under the terms of the License 

"Eclipse Public License v1.0" which accompanies this distribution, 

and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->

<!-- Initial Contributors:

    Nokia Corporation - initial contribution.

Contributors: 

-->

<!DOCTYPE concept

  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">

<concept xml:lang="en" id="GUID-3CA473CB-E79C-5B32-8B5B-F222B3DDEF3B"><title>Speech Recognition Controller Overview</title><prolog><metadata><keywords/></metadata></prolog><conbody><p>This document provides an overview of the Speech Recognition Controller (SRC) component. </p> <section><title>Purpose</title> <p>The Speech Recognition Controller component provides speech recognition services for clients requiring speech recognition functionality. The SRC component comprises a client utility, a data handler and a custom commands library. </p> </section> <section><title>Required background</title> <p>Automatic Speech Recognition (ASR) is a technology that enables users to use speech to interact with devices. ASR works by converting speech into a machine-readable form. Voice activated dialling is an example of an ASR application. </p> </section> <section><title>Architectural relationships</title> <p>The ASR Client Utility is dependent on the Multimedia Framework. The MMF acts as the interface between the ASR Client Utility and the low level DevASR. A Speech Recognition Services (SRS) controller plugin is responsible for transporting speech recognition requests from the MMF to the DevASR. For playback, the DevASR implementation uses DevSound to play the recorded speech. </p> <p>The relationship between the SRC component and other multimedia components is shown below. </p> <fig id="GUID-7A60FFE5-51FB-5379-8C78-8EA81C46F91D"><title>

             SRC component architectural relationship 

          </title> <image href="GUID-CCE61F55-DDCC-566B-B4C6-E094E8E8B073_d0e296593_href.png" placement="inline"/></fig> </section> <section><title>API summary</title> <p>The SRC component includes the following APIs: </p> <table id="GUID-A7626951-7BF0-5876-B799-F50B3F2DF587"><tgroup cols="2"><colspec colname="col0"/><colspec colname="col1"/><thead><row><entry>API</entry> <entry>Description</entry> </row> </thead> <tbody><row><entry><p> <b>Automatic Speech Recognition Client Utility</b>  </p> </entry> <entry><p>Client side interface for ASR. </p> <p>For more information, see <xref href="GUID-B454C08F-0531-5789-ABFA-171D3C2319D9.dita">Automatic Speech Recognition Client Utility Overview</xref>. </p> </entry> </row> <row><entry><p> <b>Automatic Speech Recognition Custom Commands</b>  </p> </entry> <entry><p>Custom commands for ASR. </p> <p>For more information, see <xref href="GUID-DC4BF172-CDD3-5351-BBA1-550DEC1706BD.dita">Automatic Speech Recognition Custom Commands Overview</xref>. </p> </entry> </row> <row><entry><p> <b>Automatic Speech Recognition Data Handling</b>  </p> </entry> <entry><p>Recognition data handling for ASR. </p> <p>For more information, see <xref href="GUID-F684F363-B361-5868-9195-41305428AB2D.dita">Automatic Speech Recognition Data Handling Overview</xref>. </p> </entry> </row> </tbody> </tgroup> </table> </section> <section><title>Typical uses</title> <p>The SRC component is used for the following: </p> <ul><li id="GUID-9B393CDD-1BF6-5107-98E5-97D2A820A992"><p>Recognising spoken input. </p> </li> <li id="GUID-903CDDE8-CBA3-5ACE-A32E-F15EA3FC68F8"><p>Training a new model. </p> </li> <li id="GUID-C82BD979-3704-5B29-ADB0-BAA26A79B447"><p>Manipulating grammars, lexicons and models. </p> </li> </ul> </section> <section><title>See also</title> <p><xref href="GUID-2D3F7471-9B92-5E49-B8BC-E0FA7AA709D7.dita">DevSound Overview</xref>  </p> </section> </conbody></concept>