New answers tagged audacity
This solution depends on what is the level of the background noise compared to the voice of the lecturer. If this ratio is high enough, you can try to apply gating effect. What it basically does is attenuate signals that register below the threshold, so at all times when your lecturer is silent, everything else will be silent as well. Then you can play a bit ...
If you are able to directly capture the digital feed and you record to a lossless format that matches the bit depth and sample rate of the original source, then no, you should not lose any quality. If it is going threw an analog hole, then yes, you will.
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