Voice recognition

Free or open source

• Sphinx
• Julius, so far only with a Japanese language model and acoustic model. Used by Vestec for their Asterisk solution.
• HTK – has distribution restrictions
• Wayback Machine. ViaVoice has software for both desktop and telephony applications.
• http://freespeech.sourceforge.net/FreeSpeech/html/
• StarTrinity SoftSwitch – freeware, uses Google Speech API v2 to build IVR speech applications

Commercial

• LumenVox – amongst others available for Asterisk 1.4 (a LumenVox patch for 1.2 is also available)
• Nuance (formerly ScanSoft): Professional solution, commercial ((Text-to-Speech) 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 (Text-to-Speech) 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 ((Text-to-Speech) and ASR as part of their ASP, software, or hardware appliance solutions
• Verbio ASR – available for Asterisk in Spanish, Portuguese, English, French, Catalonian, Euskera, Galician, Brazilian and different kinds of American Spanish
• Vocapia VoxSigma speech-to-text software suite

See also

• Voxforge: Collects transcribed speech for use with Free and Open Source Speech Recognition Engines (on Linux, Windows, and Mac)
• Asterisk Generic Speech API provided by res_speech primarily used with LumenVox
• Asterisk AGI and particularly EAGI
• Asterisk Cmd Voximal: Voixmal VoiceXML module for Asterisk with TTS and ASR support
• Dynamic Neural Networks for speech recognition
• ((Text-to-Speech (TTS))): Text-to-Speech solutions
• UniMRCP: MRCP based ASR solution