I recorded a lecture with my camcorder but had to use the built-in microphone as I couldn't hook it up to the sound board.
Here's the audio track.
As you can hear, the lecture room itself has a bad acoustics, so there's quite some echo in the audio track.
Can it be improved using eg. Audacity without being a sound expert?
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What language is being spoken ?!?!?!
Does the language make a difference when doctoring an audio track?
You can use audacity's noise removal to scrub most of the background hiss and rumble which will improve perceived clarity. Then you can play with EQ to minimize some of the more annoying frequencies. It will never be perfect, but certainly understandable.