Click here to play the demo (User need to install Microsoft Internet Explorer Speech Add-in 1.0 to play the demo).
This demonstration program enables you to use the Microsoft Speech Application SDK to create a voice recognition-enabled web application. I used a tic-tac-toe game (modified from a JavaScript version). This game can be played by using speech controls and a mike, without keyboard and mouse input. This is a very simple program, but it will give you an idea on how to let your web applications interact with speech controls.
This is a multimodal application (a web application that uses speech in conjunction with a graphical interface to interact with the user). In the program, I use three kinds of Speech objects. They are grammar, prompt and listen:
| Speech Objects | Object names |
|---|---|
Grammar objects |
|
Prompt objects |
|
Listen objects |
|
welcomePrompt plays the instructions, using the text-to-speech engine. (The prompt object is associated with the TTS engine.)
askPositionListen turns on the speech recording function. (The listenprompt object is associated with the speech recognition engine.)
yourChoice() such as OnClientReco=yourChoice(), and displays an "X" into the selected square. (In the original JavaScript version of tic-tac-toe, the function yourChoice() is an onClick function such as onClick = yourChoice().) The following picture shows how an object prompt is associated with the speech recognition engine:
Included in the program files are: Microsoft.Speech.Web.dll and source JavaScript file Function.js. All the functions that are needed to play the game are in the files. The following namespace and schemas will be added to the program automatically if you are using Microsoft SASDK.
<%@ Register TagPrefix="speech" Namespace="Microsoft.Speech.Web.UI"
Assembly="Microsoft.Speech.Web, Version=1.0.3200.0, Culture=neutral,
PublicKeyToken=31bf3856ad364e35" %><body onload="OnLoad()" xmlns:speech="http://schemas.microsoft.com/speech/WebControls"
MS_POSITIONING="GridLayout">
First, let's create the rules of the grammar.
Add a RuleRef and name it Position as seen above and set its script tag. Use the example image below.
Add a list and some phrases and name them. The following chart shows the tic-tac-toe script tags. The one...nine represents the name of the squares. Also, select the Constant and type the name in the "Enter value" text box for each Script tag.
The code will be automatically generated, and will look like the box below.
We can find the rules for toplevel and Position in the code.
toplevel rule uses the ruleref element to reference the Position rule.
<item> represents a phrase. Each phrase can only have one word in this grammar.
$._value= "xx", contained in the tag element, is executed when the speech recognizer follows a path through the grammar and finds the words or phrases that the tag element follows.
<one-of> represents a word list, or dictionary. When a user speaks one of the words in the list, the recognition engine recognizes that word. <rule id="toplevel" scope="public">
<ruleref uri="#Position" type="application/srgs+xml"/>
<tag>$.Position = $$</tag>
</rule>
<rule id="Position" scope="public">
<one-of>
<item>
<item>one</item>
<tag>$._value = "one"</tag>
</item>
<item>
<item>two</item>
<tag>$._value = "two"</tag>
</item>
.
.
.
</one-of>
</rule>
The second step is to add a listen element and set its properties like this:
The code will be generated as in the box below.
The listen element specifies possible speech inputs and controls the speech recognition processes and results. Grammar is one of the main elements of the listen object. In the following, OnClientReco= "yourChoice" means that if the speech is successfully recorded, the function yourChoice will be called. The function is the same as onClick="yourChoice" in the original JavaScript program. If no recording, or silence, or random speech is detected, the listen will start again. The codes are: OnClientSilence= "ListenStart", OnClientNoReco= "ListenStart" or OnClientSpeechDetected= "ListenStart".
<speech:listen id= "AskPositionListen" runat="server" OnClientSilence=
"ListenStart" OnClientNoReco= "ListenStart"
OnClientSpeechDetected= "ListenStart"
OnClientReco= "yourChoice" MaxTimeout="15000"
EndSilence= "1000" InitialTimeout= "2000">
<Grammars>
<speech:Grammar Src="Grammars/SpeechTicTacToe.grxml#toplevel"
ID= "AskPositionListen_Grammar1">
</speech:Grammar>
</Grammars>
<Bindings>
<speech:Bind></speech:Bind>
</Bindings>
</speech:listen>
For example, once the user speaks a word and it activates the speech recognition engine, yourChoice will be called. The code: event.srcElement.recoResult.selectSingleNode("Position"); will return the value of the word.
function yourChoice()
{
//the theNode catches the result of the speech
var theNode = event.srcElement.recoResult.selectSingleNode("Position");
//the chName catches the result of the speech
//in a string format. The string should be
//one of the square's name.
var chName;
chName = theNode.text;
//display the X image in the chName square.
document.images[chName].src = "x.jpg";
.
.
.
Now, add the prompt and set its properties:
<speech:Prompt id="welcomePrompt" runat= "server"> <InlineContent> Welcome to Speech Tic-Tac-Toe! You play as theX's and the computer is the O's. Select the square you want to put your X into by saying them.Good Luck! </InlineContent> </speech:Prompt>
The following shows how to use the prompt and listen objects in JavaScript.
function OnLoad(){
//text-to-speech engine start the welcome prompt
welcomePrompt.Start();
//called the listen function
ListenStart();
}
function ListenStart(){
//speech recognization engine start to listen speech
askPositionListen.Start();
}
Users need to install Microsoft Internet Explorer Speech Add-in 1.0 in their computer in order to play the game.
Developers need to install Microsoft Speech Application SDK v1.0 Beta 3 in order to use the speech objects.
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