World Library  
Flag as Inappropriate
Email this Article

Julius (software)

Article Id: WHEBN0007367379
Reproduction Date:

Title: Julius (software)  
Author: World Heritage Encyclopedia
Language: English
Subject: List of speech recognition software, Acoustic model, Free software projects, Julius (disambiguation), Computational linguistics
Publisher: World Heritage Encyclopedia

Julius (software)

Developer(s) Lee Akinobu (Nagoya Institute of Technology)
Stable release 4.3.1 / January 15, 2014 (2014-01-15)
Written in C
Operating system Unix systems (GNU/Linux, BSD etc.), Windows (via Cygwin)
Type Speech recognition
License revised BSD style license[1]

Julius is an open source speech recognition engine.

Julius is a high-performance, two-pass large vocabulary continuous speech recognition (LVCSR) decoder software for speech-related researchers and developers. It can perform almost real-time decoding on most current PCs in 60k word dictation task using word 3-gram and context-dependent HMM. Major search techniques are fully incorporated. It is also modularized carefully to be independent from model structures, and various HMM types are supported such as shared-state triphones and tied-mixture models, with any number of mixtures, states, or phones. Standard formats are adopted to cope with other free modeling toolkit. The main platform is Linux and other Unix workstations, and also works on Windows. Julius is open source and distributed with a revised BSD style license.

Julius has been developed as part of a free software toolkit for Japanese LVCSR research since 1997, and the work has been continued at Continuous Speech Recognition Consortium (CSRC), Japan from 2000 to 2003.

From rev.3.4, a grammar-based recognition parser named "Julian" is integrated into Julius. Julian is a modified version of Julius that uses hand-designed DFA grammar as a language model. It can be used to build a kind of voice command system of small vocabulary, or various spoken dialog system tasks.


  • About Models 1
  • See also 2
  • References 3
  • External links 4

About Models

To run the Julius recognizer, you need a language model and an acoustic model for your language.

Julius adopts acoustic models in HTK ASCII format, pronunciation dictionary in HTK-like format, and word 3-gram language models in ARPA standard format (forward 2-gram and reverse 3-gram as trained from speech corpus with reversed word order).

Although Julius is only distributed with Japanese models, the VoxForge project is working on creating English acoustic models for use with the Julius Speech Recognition Engine.

See also


  1. ^ License of Julius

External links

  • Julius homepage at

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.