I suspect that crackling was data interference either from BT or USB.
You are not going to get all of those clicks out.
Have attached a cleaner version, any more processing and the voice is going to start sounding metallic.
Used two passes of gentle noise reduction, followed by some EQ (+3dB from 2 to 5KHz),
and finally, just a bit of compression (2:1 ratio with 50mS attack, 100mS release and about -10dB threshold).
I agree you can get that kind of interference from the phone being a phone. Use Airplane Mode to turn off the radio parts during recording. You can also get that kind of interference from the phone screen. The screen radiates trash and can get into sound production.
You can do experiments with all these to sort where your noise is coming from.
I have a stupid French joke. Everything sound better in French. “My house is on fire and my car won’t start.” sounds wonderful in French.
9, 6, 6 seems to work OK. There is still a tiny bit of noise still there if you turn the volume up. So that’s the limit.
I want to be clear that I’m taking a new Noise Profile at each reduction pass to make sure Noise Reduction is processing the tiny damage left by the pass before.
finally, just a bit of compression (2:1 ratio with 50mS attack, 100mS release and about -10dB threshold).
That’s not part of damage control. That’s part of theatrical production mastering. That may not match your normal mastering and it locks out any other damage processes you may want to try. That’s why I picked Amplify at the beginning. That’s just turning the volume up. That’s reversible.
That’s not part of damage control. That’s part of theatrical production mastering. That may not match your normal mastering and it locks out any other damage processes you may want to try.
I beg to differ, it’s very much part of damage control.
If you get the correct compression ratio, it will actually help in making the dialog stand out more.
Same reason why I did EQ before the compression, which will help as well.
Multiband compression will also work, but doubt that the OP will have access to it as Audacity does not ship with one.
Of course if one over does it with compression, well, it’s a one way ticket, however, look at my final levels.
They are higher than is recommended for either broadcast or social media.
That was done deliberately so that some final compression can still be used on top of that.
A word on the Rumble Filter (Low Rolloff for Speech). Your crackling is not just high pitch ticking. The sound goes lower in pitch, too, and extends below 100Hz. Nobody is going to hear that, but that sound can affect the other tools.
That Audacity filter was designed to copy the filters that outside sound recording systems have to avoid wind noise and other low pitch distortions and rumble sounds.
The Zoom H1n portable recorder has three different ones depending on how bad things get.
Post back about what you decided to do and how it worked.
I think your first experience with Noise Reduction didn’t have the Profile step included. That’s why it didn’t do anything. It’s pretty unusual for tools, filters, and effects to require two different steps, but Noise Reduction is one of those tools.
Paul2 didn’t post which Noise Reduction values he used…
7, 6, 12 - but they are really only a guide.
The higher you go, especially on the first number, the more “noise” will be reduced
however at a cost, the wanted audio starts sounding metallic.
That of course is subjective, the OP may accept more (or less) of the metallic sound than either of us.
Hence the term I used to quantify it, “gentle”.
The OP may be very happy with perhaps something as high as 10,10,12.
On the other hand, he may opt for 3,6,12.
Furthermore, you seem to have misinterpreted my method of repair and categorically stated
that somehow yours is the only bona fide way.
There are often many paths to the same destination, just because the path you always take
works for you, does not mean that it’s either the best or only route.
The point is, experiment, as long as it’s on a copy.
This then is the only way to get to know the tools well and not just copy numbers and settings
without knowing exactly what they do and why.
You may even discover new, exciting things on your detour.