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https://github.com/espeak-ng/espeak-ng

eSpeak NG is an open source speech synthesizer that supports more than hundred languages and accents.
https://github.com/espeak-ng/espeak-ng

android espeak espeak-ng speech-synthesis text-to-speech

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eSpeak NG is an open source speech synthesizer that supports more than hundred languages and accents.

Lists

README 

        
# eSpeak NG Text-to-Speech



- [Features](#features)

- [Supported languages](docs/languages.md)

- [Documentation](#documentation)

- [eSpeak Compatibility](#espeak-compatibility)

- [History](#history)

- [License Information](#license-information)

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The eSpeak NG is a compact open source software text-to-speech synthesizer for 

Linux, Windows, Android and other operating systems. It supports 

[more than 100 languages and accents](docs/languages.md). It is based on the eSpeak engine

created by Jonathan Duddington.



eSpeak NG uses a "formant synthesis" method. This allows many languages to be

provided in a small size. The speech is clear, and can be used at high speeds,

but is not as natural or smooth as larger synthesizers which are based on human

speech recordings. It also supports Klatt formant synthesis, and the ability

to use MBROLA as backend speech synthesizer.



eSpeak NG is available as:



*  A [command line](src/espeak-ng.1.ronn) program (Linux and Windows) to speak text from a file or

   from stdin.

*  A [shared library](docs/integration.md) version for use by other programs. (On Windows this is

   a DLL).

*  A SAPI5 version for Windows, so it can be used with screen-readers and

   other programs that support the Windows SAPI5 interface.

*  eSpeak NG has been ported to other platforms, including Solaris and Mac

   OSX.



## Features



*  Includes different Voices, whose characteristics can be altered.

*  Can produce speech output as a WAV file.

*  SSML (Speech Synthesis Markup Language) is supported (not complete),

   and also HTML.

*  Compact size.  The program and its data, including many languages,

   totals about few Mbytes.

*  Can be used as a front-end to [MBROLA diphone voices](docs/mbrola.md).

   eSpeak NG converts text to phonemes with pitch and length information.

*  Can translate text into phoneme codes, so it could be adapted as a

   front end for another speech synthesis engine.

*  Potential for other languages. Several are included in varying stages

   of progress. Help from native speakers for these or other languages is

   welcome.

*  Written in C.



See the [ChangeLog](ChangeLog.md) for a description of the changes in the

various releases and with the eSpeak NG project.



The following platforms are supported:



| Platform    | Minimum Version | Status |

|-------------|-----------------|--------|

| Linux       |                 | ![CI](https://github.com/espeak-ng/espeak-ng/actions/workflows/ci.yml/badge.svg) |

| BSD         |                 |        |

| Android     | 4.0             |        |

| Windows     | Windows 8       |        |

| Mac         |                 |        |



## Documentation



1. [User guide](docs/guide.md) explains how to set up and use eSpeak NG from command line or as a library.

2. [Building guide](docs/building.md) provides info how to compile and build eSpeak NG from the source.

4. [Index](docs/index.md) provides full list of more detailed information for contributors and developers.

5. Look at [contribution guide](docs/contributing.md) to start your contribution.

6. Look at [eSpeak NG roadmap](https://github.com/espeak-ng/espeak-ng/wiki/eSpeak-NG-roadmap) to participate in development of eSpeak NG.



## eSpeak Compatibility



The *espeak-ng* binaries use the same command-line options as *espeak*, with

several additions to provide new functionality from *espeak-ng* such as specifying

the output audio device name to use. The build creates symlinks of `espeak` to

`espeak-ng`, and `speak` to `speak-ng`.



The espeak `speak_lib.h` include file is located in `espeak-ng/speak_lib.h` with

an optional symlink in `espeak/speak_lib.h`. This file contains the espeak 1.48.15

API, with a change to the `ESPEAK_API` macro to fix building on Windows

and some minor changes to the documentation comments. This C API is API and ABI

compatible with espeak.



The `espeak-data` data has been moved to `espeak-ng-data` to avoid conflicts with

espeak. There have been various changes to the voice, dictionary and phoneme files

that make them incompatible with espeak.



The *espeak-ng* project does not include the *espeakedit* program. It has moved

the logic to build the dictionary, phoneme and intonation binary files into the

`libespeak-ng.so` file that is accessible from the `espeak-ng` command line and

C API.



## History



The program was originally known as __speak__ and originally written

for Acorn/RISC\_OS computers starting in 1995 by Jonathan Duddington. This was

enhanced and re-written in 2007 as __eSpeak__, including a relaxation of the

original memory and processing power constraints, and with support for additional

languages.



In 2010, Reece H. Dunn started maintaining a version of eSpeak on GitHub that

was designed to make it easier to build eSpeak on POSIX systems, porting the

build system to autotools in 2012. In late 2015, this project was officially

forked to a new __eSpeak NG__ project. The new eSpeak NG project is a significant

departure from the eSpeak project, with the intention of cleaning up the

existing codebase, adding new features, and adding to and improving the

supported languages.



The *historical* branch contains the available older releases of the original

eSpeak that are not contained in the subversion repository.



1.24.02 is the first version of eSpeak to appear in the subversion

repository, but releases from 1.05 to 1.24 are available at

[http://sourceforge.net/projects/espeak/files/espeak/](http://sourceforge.net/projects/espeak/files/espeak/).



These early releases have been checked into the historical branch,

with the 1.24.02 release as the last entry. This makes it possible

to use the replace functionality of git to see the earlier history:



	git replace 8d59235f 63c1c019



__NOTE:__ The source releases contain the `big_endian`, `espeak-edit`,

`praat-mod`, `riskos`, `windows_dll` and `windows_sapi` folders. These

do not appear in the source repository until later releases, so have

been excluded from the historical commits to align them better with

the 1.24.02 source commit.



## License Information



eSpeak NG Text-to-Speech is released under the [GPL version 3](COPYING) or

later license.



The `getopt.c` compatibility implementation for getopt support on Windows is

taken from the NetBSD `getopt_long` implementation, which is licensed under a

[2-clause BSD](COPYING.BSD2) license.



Android is a trademark of Google LLC.