enhancing voice with audacity

sample1.zip (1.53 MB)
I have a wma file that has a conversation on it from my long deceased grandfather when he was being interviewed for a book. The recording as far as I know, was just made with a standard cassette device back in '84.

About 1/2 way in the lady making the recording turned the mic off for a sec, and when she turned it back on either she forgot to put the input volume up or the mic had something covering it, as you can still hear the conversation but it is severely muffled with foreground noise.

This is the only recording we have of my grandfathers voice, and I would dearly like to clean the muffled part of it up so it was more audible. Would it be possible to use Audacity to do this, and if so, what is the best way?

I’ve attached a 40 second sample of it, I converted the wma to flac with VLC, then opened it with audacity and exported a snippet that covers from when it went from clear to very muffled.

thanks in advance

That’s Disaster Recovery.

I got nothing. The voices are too far in the mud to use Noise Reduction. You can try Effect > Equalization: Telephone Filter, but that also makes the voices sound like a telephone and may not help clarity.

We’ll see what others think.


forgot to add, using Audacity 2.1.0 on Windows 10

The fuzzy rule is if you can’t make out the words, we’re probably not going to be much help.


thanks for the reply, I’ll give that a whirl and see if any other suggestions come up.

It’s possible to remove a lot of the hiss with a free plug-in called DtBlkFx, which works in Audacity, (on Windows) …

But it doesn’t improve the intelligibility.
DtBlkFx settings used.png

Thanks for the help & suggestions everyone - so right now it’s not looking too promising, but I thought I’d try anyway…