[asterisk-users] Anyone doing speech to text?

[Lefteris Zafiris]

On Fri, 28 Aug 2015 12:11:14 +0300
Amelye Chatila <amechax at gmail.com> wrote:

> I have a similar situation here, I want to include TTS in my asterisk IVR
> system. Could someone give suggestion(s) please, I prefer open-source
> thanks in advance!
 

Hello,

what follows is a mostly incomplete list of Text To Speech (TTS) and Speech To Text (STT)
solutions available for asterisk.

-Regarding the TTS free and open source available options: 

Asterisk comes with festival (http://www.cstr.ed.ac.uk/projects/festival/) support
(app_festival) already build in. Decent quality, supports mainly English. 

There is support for flite (http://www.festvox.org/flite/) available as a 3rd party
plugin : http://zaf.github.io/Asterisk-Flite/ Quality at par with festival, much easier
to setup and use, supports only English.

Also support for espeak (http://espeak.sourceforge.net/):
http://zaf.github.io/Asterisk-eSpeak/ Average quality, supports a wide range of languages.


-Free plugins/scripts that provide TTS from a remote not-so-free service:

GoogleTTS : http://zaf.github.io/asterisk-googletts/ Great quality, lots of languages,
free of charge but NOT suitable for any serious/commercial use. It is not a service
Google officially provides but just a hack that gets synthesized speech data from their
translate page. It's more suitable for testing/developing and home use.

MsTTS: http://zaf.github.io/asterisk-mstts/ using Microsoft's Translator voice
synthesis engine.

iSpeech: http://zaf.github.io/asterisk-ispeech/ using iSpeech API (http://www.ispeech.org)


-Other non free solutions:

Cepstral: http://www.cepstral.com/en/telephony/asterisk

Speech Technology Group: http://www.asteriskexchange.com/listings/1001


-Regarding the STT options:

Google Speech: http://zaf.github.io/asterisk-speech-recog/ the API is limited at the
moment in something like 50 requests/day and considered a technology preview.

iSpeech: http://zaf.github.io/asterisk-ispeech/

Lumevox: http://www.lumenvox.com/partners/digium/asterisk.aspx

Sphinx: http://cmusphinx.sourceforge.net/wiki/asteriskdetails

Vestec: http://www.asteriskexchange.com/listings/113


Regards,

Lefteris Zafiris