I have some old voice recordings I would like to restore and I'm not sure what software I should use and in what order I should apply the different transformations.
They were digitized a while back and I only have access to the mp3 version. Some of the files are louder than others (and noisier), The noise is mostly hiss, not clicks or pops, and the voice is kind of mumbled, which I'm guessing is because of the very lossy mp3 format used.
What I'm trying to achieve is less noise, uniform sound level and, if possible, clearer voice.
My guess is that I should use a normalizer or compression to smooth the audio level and apply a noise reduction filter but I'm not sure if the noise reduction filter works better before or after the normalization step.
Also, this may sound dumb but I was wondering if it is possible to "enhance" the consonants so that the voice is easier to understand.
If any of you have ever restored this kind of audio, I'd love to hear about the process.
P.S. If a moderator should see this question, it might need some better tags, like noise-reduction or audio-restoration.