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On 21 Feb 2020 12:30:08 -0500, (Scott Dorsey) wrote:

If I were you I'd try to do some processing to improve intelligibility rather
than worrying about fidelity. High pass everything below 200 Hz or so,
then low-pass everything above maybe 6KHz, and consider sticking a presence
boost in there. You might then consider an expander and fiddling with the
threshold on the expander to try and boost the voice out of the noise.

I think you are worried about entirely the wrong thing here.
--scott

The actions on the source WAV file must be such as to maintain
authenticity. If I start changing and deleting parts of the audio
file, that would render the output file as different from the source
file, and make it untrustworthy.

Sorry to bug you, but; I've used the source WAV parameters; sample
rate 48,000 Hz and bit rate 192 kb/s; when converting to the MP3. I
don't know if this is proper for the destination MP3 file. What is
your view?