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ESpeakEngine - Objective-C speech synthesizer

By , 23 Jan 2012
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Introduction

A few years ago I was looking for some Objective-C framework which would allow to speech text on iOS devices in our project. In that time i did not find any, but only tree plain speech synth libraries written i C - eSpeak, Flite and Festival.

After couple days of research and attempts to integrate those libraries for iOS SDK I choosed eSpeak and Flite as candidates (I was able to successfully customize only eSpeak and Flite in reasonable time, they supports more languages, Google use eSpeek for its translation service…).

In next couple of lines is described first speech synthesizer wrapper - ESpeakEngine.

Background

The ESpeakEngine is Objectice-C static library project containing very light wrapper for eSpeak open source speech synthesizer. It does not add any new features to eSpeak, it only exposes its funcionality as Objective-C class methods and combines this functionality with iOS AVFoundation Framework (to see all available properties of eSpeak synthesizer, please read documentation on its homepage url). It also uses standard delegate pattern by defining ESpeakEngineDelegate.

In static library project also exists a test target which contains simple iPhone app. This sample app has only a one screen with the UITextView for text input and the UIButton to start speech syntesis of an entered text.

Using the code

Usage of the ESpeakEngine is very easy, You have to only add a standard dependency on the ESpeakEngine static library project to Your project (simply drag and drop library project file from Finder to Project Navigator):

Screen_Shot_2012-01-24_at_10.34.07.png

add path to folder eSpeak_1.0/Classes in Target Build Settings: Header Search Paths:

Header_search_paths.png

Link ESpeakEngine binary and AVFundation.Framework:

Linked_binaries.png

and link also ESpeakEngine data folder espeak-data - simply drag and drop this folder from referenced eSpeak.xcodeproj project to parent project (to its any group, i drop it in example project to group ESpeakTest/Supporting Files):

Link_epeak-data_dialog.png

Linked_espeak-data.png

Then import the ESpeakEngine header in class which is holding engine instance:

#import "ESpeakEngine.h"   
In the init or the viewDidLoad method create a new instance of the ESpeakEngine and set all parameters you want (language, volume, gender… etc.):
- (void)viewDidLoad {
    [super viewDidLoad];
    engine = [[ESpeakEngine alloc] init];
    engine.volume = 1;
    [engine setLanguage:@"en"];
} 

And finally bind any button touch event to code which calls the ESpeakEngine a speak method:

- (IBAction)speech {
    NSString * text = self.textView.text;
    [engine speak:text];
}

Points of Interest

No documentation is included in this up-to-date version. Anyhow, the source code is self-explanatory and has altogether only a few hundred lines, also test application is good start point to look for more properties.

Any questions will be answered, feel free to contact me.

History

  • 2010 Initial version

License

This article, along with any associated source code and files, is licensed under The BSD License

About the Author

Jozef Bozek
CEO bring-it-together s.r.o.
Slovakia Slovakia
Jozef Božek is currently a software engineer at bring-it-together s.r.o. in area of large scale infomation systems and mobile applications development.
He has been developing in C++ nearly full time since 2000, in Java since 2004 and in Objective-C since 2009. He is programming using Java EE SDK, iOS SDK, COM/DCOM, MFC, ATL, STL and so on Smile | :)
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Comments and Discussions

 
QuestionCan't read data file: PinmemberAnandhakumar Palanisamy20-Feb-13 0:10 
GeneralMy vote of 3 PinmemberLinasses11-Jan-13 0:32 
Questionjust awful speech! PinmemberYoeluk15-Dec-12 10:00 
AnswerRe: just awful speech! PinmemberJozef Bozek15-Dec-12 12:01 
GeneralRe: just awful speech! PinmemberYoeluk15-Dec-12 17:18 
I'm sorry Jozef I didn't mean that personally. I take back "nice try". I realised that it was out of my frustration looking for a text-to-speech that sounds natural. I downloaded twitran and can not find where is the button to put the text-to-speech to the test. However I did implemented ESpeakEngine following your guide and some other minor changes because the errors that you get on Xcode 4.5.2 with the current guide. The result was a computerised voice though. This might be okay in a context like twitran but totally inadequate if the purpose is to read instructions to a native English speaker in English. If you think that I'm wrong (I really want to be wrong!) tell me where is the text-to-speech on twitran. I'll buy it if necessary and give you a five stars review if the voice isn't computerised and if so hopefully you can tell me how to make it sound natural in my implementation.
 
In any case, thanks a lot for sharing what you've made Smile | :)
AnswerRe: just awful speech! PinmemberJozef Bozek6-Feb-13 22:28 
QuestionEspeak Text to speech Pinmemberammadandamu2-Dec-12 6:37 
AnswerRe: Espeak Text to speech PinmemberJozef Bozek15-Dec-12 11:50 
QuestionUsing different accents Pinmemberpluto9999-Oct-12 13:57 
AnswerRe: Using different accents PinmemberJozef Bozek15-Dec-12 11:53 
QuestionEspeak Iphone Project How to change male voice ? Pinmemberbilal7869918-Sep-12 23:44 
AnswerRe: Espeak Iphone Project How to change male voice ? PinmemberJozef Bozek25-Oct-12 4:25 
QuestionI follow your instructions and found 2 problems Pinmemberamielreyes033-Jul-12 21:25 
AnswerRe: I follow your instructions and found 2 problems PinmemberJozef Bozek15-Dec-12 11:57 
GeneralRe: I follow your instructions and found 2 problems PinmemberLinasses10-Jan-13 6:56 
AnswerRe: I follow your instructions and found 2 problems PinmemberJozef Bozek6-Feb-13 22:05 
QuestionPlease help me Device error- Pinmembernielmabahohehehe1-Jul-12 14:50 
AnswerRe: Please help me Device error- PinmemberJozef Bozek2-Jul-12 6:10 
QuestionProblem deploying to device PinmemberMember 386931717-May-12 6:12 
AnswerRe: Problem deploying to device PinmemberJozef Bozek22-May-12 5:00 
QuestionCant get working on device. Pinmemberjayy6615-May-12 17:43 
AnswerRe: Cant get working on device. PinmemberJozef Bozek15-May-12 21:37 
GeneralRe: Cant get working on device. Pinmemberjayy6616-May-12 16:03 
GeneralRe: Cant get working on device. Pinmemberjayy6616-May-12 16:33 
QuestionNot working in RubyMotion PinmemberMember 896498111-May-12 23:57 

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