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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? –  queueoverflow Jul 9 '12 at 11:33
    
The speech text is in simple english. –  Kopano Jul 9 '12 at 14:33
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2 Answers

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

Description

"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

http://julius.sourceforge.jp/en_index.php

http://sourceforge.net/projects/speech2text/

http://simon-listens.org/index.php?id=122&L=1

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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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