Improve sound quality of a recorded audio

Rohit Bajaj
Rohit Bajaj used Ask the Experts™
I have a recorded lecture which I recorded on my mobile using smart recorder android app. This is a .wav file of around 180 mb.
There are following issues with it -
1) some places the sound volume is low.
2) There is disturbance in sound and although loud but one cannot properly understand what is the person speaking.

please suggest some tools which can remove these defects.
Main issue is to remove the disturbance so that one can hear words clearly.

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you can try using Audacity® to clean up your audio file.
Audacity® is free, open source, cross-platform audio software for multi-track recording and editing.
Noise Reduction

Audacity's Noise Reduction effect can be used to attenuate constant background noise such as tape hiss, electric fans or hums. It will not work very well for removing talking or music in the background. There are two steps:
  - Show Audacity a "noise profile" - a short section of audio containing only the noise to be reduced
  - Return to the effect to apply the noise profile to all the audio.
forgot the link:
dhsindyRetired considering supplemental income.

Fidility is the measure of accuracy of a recorded sound.  I don't think there is anyway to increase the quality of the recording.  You can adjust loudness, etc but you cannot add sounds that are not there originally.
"I don't think there is anyway to increase the quality of the recording. "
This is not true.
You do not add new information, something that is not in the original recorded file, but you can clean it by removing different unwanted info/frequency, noise and you extract the existing info clean.
That is called improving the quality of the recording if you want to call it like that.
For example a person speaking on the street, near a train station a phone ringing around. You can get only the clear voice without background street noise, without ringing of the phone or the train around with the right program and experience.

We do not speak here about that analogy with image when someone make a low resolution photo of the car and zoom in until you the number. If the information is not there you cannot invent it, but if it is there, there are methods to extract it and smooth it, presented in a usable form.

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