Skip to content
Pure Java speech recognition library
Branch: master
Clone or download
nshmyrev Merge pull request #91 from dakshing/master
Close Microphone connection
Latest commit d02fe6a Apr 14, 2019
Type Name Latest commit message Commit time
Failed to load latest commit information.
doc Update docs somewhat Jan 30, 2015
sphinx4-core Aligned Apr 14, 2019
sphinx4-data Updated the en-us dict May 2, 2018
sphinx4-samples Allphone does not return lattices. Fixes Jul 26, 2016
tests Allow relative path too Apr 5, 2014
README Update README style. See for details Mar 25, 2015
RELEASE_NOTES Update docs somewhat Jan 30, 2015
settings.gradle One more gradle update Dec 5, 2015


Sphinx-4 Speech Recognition System

Sphinx-4 is a state-of-the-art, speaker-independent, continuous speech
recognition system written entirely in the Java programming language. It
was created via a joint collaboration between the Sphinx group at
Carnegie Mellon University, Sun Microsystems Laboratories, Mitsubishi
Electric Research Labs (MERL), and Hewlett Packard (HP), with
contributions from the University of California at Santa Cruz (UCSC) and
the Massachusetts Institute of Technology (MIT).

The design of Sphinx-4 is based on patterns that have emerged from the
design of past systems as well as new requirements based on areas that
researchers currently want to explore.  To exercise this framework, and
to provide researchers with a "research-ready" system, Sphinx-4 also
includes several implementations of both simple and state-of-the-art
techniques.  The framework and the implementations are all freely
available via open source under a very generous BSD-style license.

Because it is written entirely in the Java programming language, Sphinx-4
can run on a variety of platforms without requiring any special
compilation or changes.  We've tested Sphinx-4 on the following platforms
with success.

To get started with sphinx4 visit our wiki

Please give Sphinx-4 a try and post your questions, comments, and
feedback to one of the CMU Sphinx Forums:
We can also be reached at


The Sphinx-4 Team:  
(in alph. order)    

Evandro Gouvea, CMU (developer and speech advisor)
Peter Gorniak, MIT (developer)
Philip Kwok, Sun Labs (developer)
Paul Lamere, Sun Labs (design/technical lead)
Beth Logan, HP (speech advisor)
Pedro Moreno, Google (speech advisor)
Bhiksha Raj, MERL (design lead)
Mosur Ravishankar, CMU (speech advisor)
Bent Schmidt-Nielsen, MERL (speech advisor)
Rita Singh, CMU/MIT (design/speech advisor)
JM Van Thong, HP (speech advisor)
Willie Walker, Sun Labs (overall lead)
Manfred Warmuth, USCS (speech advisor)
Joe Woelfel, MERL (developer and speech advisor)
Peter Wolf, MERL (developer and speech advisor)
You can’t perform that action at this time.