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Does any one know of an application that can convert audio to text? I'm running ubuntu 12.04 LTS.

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I assume it is spoken text. Which language is that text in? – Martin Ueding Jul 9 '12 at 11:33
The speech text is in simple english. – Kopano Jul 9 '12 at 14:33

The software you can use is CMUSphinx. Unlike suggested in another answer Julius is not suitable because it requires models. Models for large vocabulary speech recognition are not available for Julius.

You can use pocketsphinx to convert audio file. Those two commands must do the work. First you convert the file to the required format and then you recognize it:

ffmpeg -i file.mp3 -ar 16000 -ac 1 file.wav
pocketsphinx_continuous -infile file.wav -hmm en-us -lm en-us.lm.dmp 2> pocketsphinx.log

US English generic acoustic models are available for download on CMUSphinx website

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also, as an addition to this answer, there's a cool demo of both speech recognition and voice command tools here:… – Daithí Jan 8 '15 at 10:22
How do you add an acoustic model to the system? – jarno Feb 8 '15 at 13:38
You just download it and unpack, there is no such thing as "add to the system" – Nikolay Shmyrev Feb 8 '15 at 13:56
@NikolayShmyrev Where should I unpack it so that pocketsphinx_continuous finds it? – jarno Feb 8 '15 at 14:14
Well, I installed packages pocketsphinx-utils, pocketsphinx-hmm-en-hub4wsj and pocketsphinx-lm-en-hub4 in universe repository of Ubuntu 14.04. Then pocketsphinx_continuous -infile file.wav -hmm en_US/hub4wsj_sc_8k -lm en_US/hub4.5000.DMP 2> pocketsphinx.log worked. Maybe they are not optimal packages, but they were best matches I could find in the repositories. – jarno Feb 8 '15 at 15:05

I you are looking to convert speech to text you could try opening up your Ubuntu Software Center and search for Julius


"Julius" is a high-performance, two-pass large vocabulary continuous speech recognition (LVCSR) decoder software for speech-related researchers and developers.

Or another option that isn't in the Software Center is Simon

... is an open-source speech recognition program and replaces the mouse and keyboard.

Reference Links

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You can use transcription panel

See video of using transcription

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