Voice recognition

Free or open source

• Sphinx
• IBM ViaVoice,see also http://volker.dnsalias.net/linux/speechrec.html, also available as Google cache or Wayback Machine. ViaVoice has software for both desktop and telephony applications.
• Julius, so far only with a Japanese language model and acoustic model
• http://perlbox.org/: Open source voice recognition for desktop steering
• http://freespeech.sourceforge.net/FreeSpeech/html/
• ZOIP: Text adventure ZORK for Asterisk (with text-to-speech and voice recognition)

Commercial

• LumenVox - amongst others available for Asterisk 1.4 (a LumenVox patch for 1.2 is also available)
• Nuance (formerly ScanSoft): Professional solution, commercial TTS and ASR software often used for telephony applications
• Loquendo: Professional solution
• Acculab - Built-in to commercial DSP-based telephony cards
• Lernout & Hauspie - Commercial software often used for telephony and embedded applications
• Microsoft Speech Server - Does ASR and TTS with support for telephony applications
• Other vendors: IBM, Fonix Speech, Sensory Inc., Verbio, Voice Signal Technologies, Vorero, Utopy
• Asterisk cmd ASR - professional, multilanguage voice recognition for Asterisk based on ASP model
• VoiceXML platforms typically offer TTS and ASR as part of their ASP, software, or hardware appliance solutions

See also

• Asterisk Generic Speech API provided by res_speech primarily used with LumenVox
• Asterisk AGI and particularly EAGI
• Overview on speech recognition
• Dynamic Neural Networks for speech recognition
• Articles on speechcontrol.com
• TTS: Text-toSpeech solutions