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I heard about existence of some speech recognition systems, and it seems I need one of those. Basically, I have an audio file with speech (only one person is speaking most of the time), and I want to get a transcript of the speech.

Is something like that possible?

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I don't think there's open-source voice-recognition engine available – warl0ck Sep 2 '12 at 6:00
en.wikipedia.org/wiki/List_of_speech_recognition_software has several open source ones – derobert Sep 2 '12 at 7:00

You could give Palaver a try. Recently released and still beta but quite OK.
Here is video showing some of the features, including dictation mode.

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