Satish Swaroop ([email protected])
Senior Consultant, SBI Inc.
01 Nov 2001
Java Speech API
The Java Speech 1.0 API (JSAPI) specification made it easy for Web developers to create applications that do speech synthesis and voice recognition. JSAPI is cross-platform and supports command and control recognizers, dictation systems, and speech synthesizers. The JSAPI specification is available on Sun's Web site; it includes the Javadoc-style API documentation containing about 70 classes and interfaces in the API (see Resources for a link).
You can use JSAPI in both applets and applications. Now you can direct a user interface by giving instructions through voice. For example, if you want to complete a form that needs demographic data, you can simply speak the values for different fields. Instead of typing your address, city, state, and ZIP code you can speak these values one by one and appropriate fields get filled in as you proceed. JSAPI can also be effectively used in eCommerce Web sites. If shoppers want to search for a specific product, they can speak the search criteria, and your application searches for and displays it in the browser (or any other device used for searching).
Figure 1 below shows the workings of a speech application. The speech synthesizer and speech recognizer are the instances of the javax.speech.synthesis package and javax.speech.recognition package. These packages have the basic function for speech synthesis and speech recognition.
Figure 1. Workings of a speech application
Another very important aspect of speech application is grammar. A grammar is an object in the JSAPI that controls the recognition process by telling the speaker what words they're expected to say and the patterns in which these words may occur. The biggest advantage of a grammar file is that it makes the recognition faster and more accurate. A sample grammar file is below.
Sample grammar filegrammar javax.speech.demo; public <sentence> = Welcome | Hello | IBM | ViaVoice | Java | Good Job | Thank you very much | GoodBye;
You can add more words or sentences to the grammar file. Note that each word or sentence is separated by the "|" character.
IBM Speech for Java and ViaVoice
IBM implemented the specification of JSAPI and created Speech for Java, which is based on ViaVoice technology that provides continuous dictation (speech recognition) and text-to-speech conversion (speech synthesis). The latest version of ViaVoice includes a recognition engine with improved accuracy, expandable to an active vocabulary of two million words, and other features.
Speech for Java currently supports US English, UK English, Brazilian, Portuguese, French, German, Italian, and Spanish completely, and Japanese for recognition only. Speech for Java runs on Windows and Linux, and can be downloaded from the IBM alphaWorks Web site.
Your computer should meet the following minimum requirements to run IBM ViaVoice:
166MHz Pentium or 150MHz Pentium with MMX, running Windows 95 with 32MB of memory or Windows NT with 48MB, and Sun JDK 1.1.7 or 1.2, or 166MHz Pentium MMX with 32MB of memory running RedHat 6.1 Linux with IBM JDK 1.1.8 or BlackDown JDK 1.2.2 (with native thread support -- Speech for Java only works with native threads)Also, be sure that you
Have installed ViaVoice before unpacking the install package After unpacking the package, set the CLASSPATH to include \lib\ibmjs.jar Set PATH (or LD_LIBRARY_PATH on Linux) to include the \lib directory Also execute install.bat (or sh install.sh on Linux) to register the IBM engines with the system.Creating a speech application
This section explains the steps involved in creating any speech application. Once you have set up the environment, you are ready to write an application that does speech recognition and speech synthesis. The major tasks in creating any speech application are
Before you run the sample application,
Be sure Speech for Java and ViaVoice are installed. CLASSPATH AND PATH should be set in the environment. For information about setting these, see the README.HTML file provided with the Speech For Java install program. You should have a headset ready. Create a grammar file with all the valid names and order numbers that you want the Recognizer to capture when the application runs. Create an ORDERS table as shown below: Column Name Column Type Description ORRFNBR INTEGER NOT NULL Order Reference Number SHOPPER_NAME CHAR (50) Full Name of the shopper JOB_STATUS SMALLINT (2) Valid Values are:Y or N ORSTAT CHAR (1) Valid values of Order status are:The following "AllSpeechApp" application demonstrates speech synthesis and speech recognition using JSAPI and IBM Speech for Java. In this application the speaker completes the form by speaking the information required, the application processes the information, then the computer speaks the result.
The application shows a real-time requirement of an eCommerce Web site where a shopper wants to know the current status of the order placed. The shopper provides the information (name, order number, and confirmation to e-mail notification), and the application returns the order status. There are three stages in this application:
A data entry form is displayed in Figure 2 below. At this point, the form takes voice input only, and can easily be enhanced for keyboard and mouse support. It is purposely set to voice-only mode so you can see the efficiency of Speech for Java with ViaVoice and JSAPI.Figure 2. The input form
Figure 3. The speaker speaks, the fields get filled
The shopper can reset the form at any time by saying Cancel.
Finally, when the shopper says Submit, the information in the form is processed and the order status is searched in the database. When the status is found it is written and spoken by the computer for the shopper as shown in Figure 4 below. The computer speaks Order Number <order no> is <Pending, Cancelled, or Completed>. In this case, it says "Order Number 11 is Completed" as shown in red.Figure 4. The output form
Code samples
This section shows the basic framework of the code that performs the functions described above. The declarations and methods are then shown one by one to get a good understanding of the code. If desired, you can download the .jar file from the Resources section and see all of the code together.
/** *File: AllSpeechApp.java 1.0 2001/09/01 */ //Import statements --- --- --- public class AllSpeechApp extends ResultAdapter { /** * Common Declarations */ --- --- --- /** * createComponents - creates a pane and add header label to it. */ public Component createComponents(String printText) { --- --- --- } /** * Creates a database connection, and gets the * order_status from the Orders table. * Writes the text on the panel. * Speaks the text as * 'Order number <order number> is <order status>'. */ public void getResult(String orderNum) { --- --- --- } /** * Listens and stores the spoken text. * This is Speech Recognition method. * This method also writes the text on the screen using CreateForm() method. */ public void resultAccepted(ResultEvent e) { --- --- --- } /** * The parameter passed in this method is spoken by the computer. * This is Speech Synthesis (Text To Speech) method. */ public void MySpeech(String SpeakText) { --- --- --- } /** * Creates the form. */ public boolean createForm(String fieldName,String PrintText) { --- --- --- } /** * Main Method. */ public static void main(String[] args) { --- --- --- } }
The following section discusses all the commented blocks shown in the above framework.
Import all the necessary packages
//Import statements
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.speech.*;
import javax.speech.recognition.*;
import javax.speech.synthesis.*;
import java.util.Locale;
import java.io.FileReader;
import java.awt.Color;
import java.net.*;
import java.sql.*;
Common declarations and initializations
/**
* Common declarations and initializations:
*/
JPanel pane;
JLabel label, head2, OrderRefNum_label,
Name_label,email_label,label_status;
JTextField order_rn,Name;
JButton submit,cancel;
JRadioButton email_yes,email_no;
String newWord1="";
String orderStatus_DB="";
String email_status_y, email_status_n;
static JFrame frame =
new JFrame("Speech-Text-Speech - Check order Status");
boolean success_Name=false,email_statusNO, email_statusYES;
int ordNum=0; String orderNumber="";
static Recognizer rec;
//Database Related Declarations
Connection theConnection;
ResultSet theResult1;
Statement theStatement1;
// Replace it with your JDBC driver name.
String driver="sun.jdbc.odbc.JdbcOdbcDriver";
// Replace it with your database login id.
String dbuser="satishs";
// Replace it with your database password.
String dbpasswd="SSSSSS";
// Replace it with your database name.
String db="MyLearning";
String driver_db="jdbc:odbc:";
String DRIVERDB=driver_db.concat(db);
// Fonts
Font HEADER_FONT= new Font("ARIAL", 1, 16);
Font NORMAL_FONT= new Font("ARIAL", 0, 6);
Create the pane and header label in the pane
/**
* createComponents - creates a pane and add header label to it.
*/
public Component createComponents(String printText)
{
pane = new JPanel();
pane.setBorder(BorderFactory.createEmptyBorder(
10, //top
10, //left
10, //bottom
10) //right
);
label = new JLabel("Find Status of your order : ");
label.setFont(HEADER_FONT);
label.setForeground(new Color(0,0,238));
pane.add(label);
return pane;
}
Create database connection and get order status
/**
* Creates a database connection, and gets the order_status
* from the Orders table.
* Writes the text on the panel.
* Speaks the text as
* 'Order number <order number> is <order status>'.
*/
public void getResult(String orderNum)
{
try
{
//Loading Sun's JDBC ODBC Driver
Class.forName(driver);
theConnection = DriverManager.getConnection(DRIVERDB,dbuser,dbpasswd);
theStatement1=theConnection.createStatement();
String query="SELECT orstat from orders where orrfnbr="+orderNum;
theResult1=theStatement1.executeQuery(query);
while(theResult1.next())
{
orderStatus_DB=theResult1.getString("orstat");
}
theResult1.close(); //Close the result set
theStatement1.close(); //Close statement
theConnection.close(); //Close the connection
String part1= "Order Number "+orderNum+" is ";
if(orderStatus_DB.equals("C"))
{
orderStatus_DB="Completed.";
}
else if(orderStatus_DB.equals("P"))
{
orderStatus_DB="Pending.";
}
else if(orderStatus_DB.equals("X"))
{
orderStatus_DB="Cancelled.";
}
String displayOrdStatus=part1.concat(orderStatus_DB);
//Writes the text on the panel
createForm("label_status",displayOrdStatus);
//Speaks the text
MySpeech(displayOrdStatus);
//Set the focus back to the Name field.
Name.requestFocus();
//Repaint the panel
pane.repaint();
}
catch(Exception e)
{
System.out.println("Exception in getResult : " +e);
}
}
Speech recognition method
/**
* Listens and stores the spoken text.
* This is Speech Recognition method.
* This method also writes the text on the screen using CreateForm() method.
*/
public void resultAccepted(ResultEvent e)
{
try
{
Result r = (Result)(e.getSource());
ResultToken tokens[] = r.getBestTokens();
for(int i=0;i<tokens.length;i++)
{
newWord1 = newWord1.concat(tokens[i].getSpokenText());
newWord1 = newWord1.concat(" ");
}
int len_tokens= tokens.length;
if(len_tokens==2)
{
String name = tokens[0].getSpokenText().concat(" ");
name=name.concat(tokens[1].getSpokenText());
success_Name = createForm("Name",name);
}
if(success_Name)
{
order_rn.requestFocus();
//Sets the order number in the form
if(len_tokens == 1)
{
order_rn.setText("");
int numstarts = newWord1.indexOf("1");
orderNumber = newWord1.substring(numstarts,numstarts+2);
order_rn.setText(orderNumber);
}
//Sets the order email notification flag to yes or no.
int email_status_yes = newWord1.indexOf("Yes");
int email_status_no = newWord1.indexOf("No");
if(email_status_yes>0)
{
email_status_y = newWord1.substring(email_status_yes,newWord1.length());
email_yes.setSelected(true);
submit.requestFocus();
}
else if(email_status_no>0)
{
email_status_n = newWord1.substring(email_status_no,newWord1.length());
email_no.setSelected(true);
submit.requestFocus();
}
email_statusYES=email_yes.isSelected();
email_statusNO =email_no.isSelected();
/* Checks if shopper said 'Submit'.
* If so, submit the form by calling getResult() method.
*/
int submitStarts = newWord1.indexOf("Submit");
if(submitStarts > 0)
{
int numstarts = newWord1.indexOf("1");
orderNumber = newWord1.substring(numstarts,numstarts+2);
//Get order status from the Database
getResult(orderNumber);
newWord1="";
Name.setText("");
order_rn.setText("");
email_yes.setSelected(false);
email_no.setSelected(false);
}
/**
* Checks if shopper said 'Cancel'. If so, resets the form.
*/
int cancelStarts = newWord1.indexOf("Cancel");
if(cancelStarts > 0)
{
Name.requestFocus();
newWord1="";
Name.setText("");
order_rn.setText("");
email_yes.setSelected(false);
email_no.setSelected(false);
}
}
}
catch (Exception e2)
{
System.out.println("\n EXCEPTION in resultAccepted :\n"+e2);
}
//Add the window listner.
frame.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
frame.setSize(600,275);
frame.setVisible(true);
}
Speech Synthesis Method
/**
* The parameter passed in this method is spoken by the computer.
* This is Speech Synthesis (Text To Speech) method.
*/
public void MySpeech(String SpeakText)
{
try
{
// Create a synthesizer for English
Synthesizer synth = Central.createSynthesizer(
new SynthesizerModeDesc(Locale.ENGLISH));
// Get it ready to speak
synth.allocate();
synth.resume();
//Speak Now...
synth.speakPlainText(SpeakText, null);
// Wait till speaking is done
synth.waitEngineState(Synthesizer.QUEUE_EMPTY);
// Clean up
synth.deallocate();
}
catch (Exception e1)
{
System.out.println("EXCEPTION in MySpeech :" + e1);
}
}
To create the form
/**
* Creates the form.
*/
public boolean createForm(String fieldName,String PrintText)
{
Component contents = createComponents("");
frame.getContentPane().add(contents,BorderLayout.CENTER);
pane.setLayout(new GridLayout(8,3,2,2));
//Instantiate all components
Name_label = new JLabel("Enter Your Name :");
label_status = new JLabel("label_status");
OrderRefNum_label = new JLabel("Enter Order Number :");
email_label =
new JLabel("Did you get an email confirmation for your order?");
Name = new JTextField("",30);
order_rn = new JTextField("",5);
email_yes = new JRadioButton("Yes");
email_no = new JRadioButton("No");
ButtonGroup group = new ButtonGroup();
submit = new JButton("Submit");
cancel = new JButton("Cancel");
JLabel blank1 = new JLabel(" ");
JLabel head2 = new JLabel("[Voice Only Mode]");
//Set attributes
head2.setForeground(new Color(0,0,238));
submit.setBackground(new Color(0,0,128));
submit.setForeground(Color.white);
cancel.setBackground(new Color(0,0,128));
cancel.setForeground(Color.white);
group.add(email_yes);
group.add(email_no);
Name_label.setForeground(new Color(139,37,0));
OrderRefNum_label.setForeground(new Color(139,37,0));
email_label.setForeground(new Color(139,37,0));
//Add all components
head2.setFont(HEADER_FONT);
pane.add(head2);
pane.setFont(NORMAL_FONT);
pane.add(Name_label);
pane.add(Name);
pane.add(OrderRefNum_label);
pane.add(order_rn);
pane.add(email_label);
pane.add(email_yes);
pane.add(blank1);
pane.add(email_no);
pane.add(submit);
pane.add(cancel);
if(fieldName.equals("Name"))
{
Name.setText("");
Name.setText(PrintText);
order_rn.setText("");
email_yes.setSelected(false);
email_no.setSelected(false);
return true;
}
else if(fieldName.equals("order_rn"))
order_rn.setText(PrintText);
else if(fieldName.equals("label_status"))
{
pane.add(label_status);
label_status.setText(PrintText);
label_status.setForeground(Color.red);
label_status.setFont(HEADER_FONT);
}
else
{
return false;
}
return false;
}
Main Method
/** * Main Method. */ public static void main(String[] args) { AllSpeechApp ASApp = new AllSpeechApp(); ASApp.createForm("Name",""); try { // Create a recognizer that supports English. rec = Central.createRecognizer(new EngineModeDesc(Locale.ENGLISH)); // Start up the recognizer rec.allocate(); // Load the grammar from a file, and enable it //(order_search.gram in this case). FileReader reader = new FileReader(args[0]); RuleGrammar gram = rec.loadJSGF(reader); gram.setEnabled(true); // Add the listener to get results rec.addResultListener(new AllSpeechApp()); // Commit the grammar rec.commitChanges(); // Request focus and start listening rec.requestFocus(); rec.resume(); } catch (Exception e3) { System.out.println("Exception in MAIN method : " + e3); } /** * Displays the frame first time */ frame.setSize(600,275); frame.setVisible(true); frame.setResizable(false); }
Testing the sample application
To test the "AllSpeechApp" application, follow these steps:
grammar javax.speech.AllSpeechApp; public <sentence> = Meg Carrol | John Pike | Bob Smith | Satish Swaroop | Mark Jones | Joe Jacobson | 11 | 12 | 13 | 14 | 15 | Yes | No | Submit | Cancel;
Note that line 2 and line 3 contain all the valid shopper names and line 4 contains all the order numbers. Modify the order numbers as they appear in your ORDERS table.
Save your grammar file as order_search.gram Compile your program by typing javac AllSpeechApp.java on the command line. Finally, type 'java AllSpeechApp order_search.gram' on the command line to start the application.Summary
I hope my sample application and code showed how easy it can be to implement speech recognition and synthesis using Java Speech API and IBM's Speech for Java. As speech becomes a more common way to interact with computers, the possibilities for speech interaction go way beyond "smalltalk".
Resources
Participate in the discussion forum on this article. (You can also click Discuss at the top or bottom of the article to access the forum.)
Download a jar file that contains the code used in this article.
Get more details on IBM ViaVoice from Developer's Corner and IBM Voice Systems.
Read about Speech for Java from alphaWorks and then download the code.
Learn more about the Sun Java Speech API (JSAPI) or get Java Speech API specifications and publications from Sun's site.
Download an evaluation copy of the IBM ViaVoice SDK for Windows.
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