"Julius" is an open-source, high-performance large vocabulary continuous speech recognition (LVCSR) decoder software for speech-related researchers and developers. Based on word N-gram and triphone context-dependent HMM, it can perform almost real-time decoding on most current PCs with small memory footprint.

It also has high vesatility. The acoustic models and language models are pluggable, and you can build various types of speech recognition system by building your own models and modules to be suitable for your task. It also adopts standard formats to cope with other toolkit such as HTK, CMU-Cam SLM toolkit, etc.

The core engine is implemented as embeddable library, to aim to offer speech recognition capability to various applications. The recent version supports plug-in capability so that the engine can be extended by user.

Julius is an open-source software, and is available for free with source codes. You can use Julius for any purpose, including commercial ones, at your own risk. See the license document as included in the package for details.

Our motivation to develop such an open-source speech recognition engine is to promote the high-standard recent advances in speech recognition studies toward open community, and to encourage speech processing related researches and developments on various fields. The first version of Julius was released on 1996, and due to its technical challenges and public needs, this work still continues until now.

Julius is being maintained at the institutes and groups listed below. To make a contact, please E-mail to , or access directly to the developer or maintainer.

 Copyright (c) 1991-2009 Kawahara Lab., Kyoto University
 Copyright (c) 1997-2000 Information-technology Promotion Agency, Japan
 Copyright (c) 2000-2005 Shikano Lab., Nara Institute of Science and Technology
 Copyright (c) 2005-2009 Julius project team, Nagoya Institute of Technology

The project Web page is located at . You can get the latest version of Julius, several models, documents and source code references. You can also obtain the source snapshot of the current development version via CVS. There is also a web forum for the developers and users using Julius.

The "Julius" was named after "Gaius Julius Caesar", who was a "dictator" of the Roman Republic in 100 B.C.

This is a total reference book of Julius.