can i subtract audio selected under spectral selection?

Report · Jan 19, 2020

hi

i have an audio with some noise

i would like to select the noise under spectral and remove from the same audio

i have tried with the multi track without luck

what i did

1) loaded the audio in audition cc

2) spetral view mode , selected the audio i want to remove ,copy and created a new audio file

3) multi track original audio 1 track , noise (pasted several times) polariti reverse

is there a way to subract it ?

thanks

Report · Jan 19, 2020

It's complicated to explain, but I'm afraid that you simply can't get rid of noise like that. If you subtract noise from noise you end up with - noise! It's all to do with correlation, and that's the reason that Audition has different ways of dealing with it, involving processing using Fast Fourier Transforms on small bits at a time. That's what Noise Reduction does - you take a sample of just the noise, and use that as the basis for the processing.

Yes, you can do this with a spectral selection of just what you want to remove. You can make your selection a noise sample for NR using Shift+P, although you are likely to get a warning that this isn't a complete sample. If you are absolutely sure, then just go with what you've selected. Generally though it's best to let the NR process analyse all the noise in the file, and deal with that.

The only sounds you can remove by inversion are ones where the nature of what you are removing is discrete - so if you had a tone, for example, and you could copy it and invert your copy sample-accurately and place it over the original, then it would certainly reduce its level. How well this would work depends entirely on how the tone was recorded though - if it was with a microphone in a room, then you'd still be left with the room's contribution to it - as that would be uncorrelated.

Report · Jan 19, 2020

Hi Steve

the audio material are voice recording clips

but mostly denoisers do create audio artefacts when i try to remove it , the voice

i have tried the audition cc noise reduction , sound remover and the adatptive noise reduction , and i have tried the trial version of Acon denoise ,izotope rx 7 spectral denoiser without a very clean audio(i guess it's the lastest and the only plugin to remove noise from izotepe)

and an amazing plugin called Accusonus denoiser

the audition cc automatic denoiser are not so good compared to the others

Quote

"If you subtract noise from noise you end up with - noise!"

-> it was a old skill used with cool edit pro in the past

ps i really miss the forum dedicated to audition "master" , really amazing forum with lots of information ,i missed

Report · Jan 19, 2020

I give up. It wasn't an 'old skill used with Cool Edit Pro in the past'. The fact that you can't do what you suggest is based on the Laws of Physics, and it's never changed. And, all NR processes are only ever as good as the person using them. Audition's NR works fine if you use it correctly. Okay, it may be a bit more work, but you can generally get there in the end. Even with iZotope's RX7, you get better results with multiple passes - just as their pro tips suggest.

As far as AudioMasters forum is concerned - there was a limit to how long it was worth keeping it going with nobody using it, quite frankly. Much of the information on there was based on Audition/CEP versions that weren't in general use any more, and a lot of the rest of it had no general relationship with anything in particular! So, it reached its sell-by date, and that was it.

Report · Jan 19, 2020

Hi

may i ask you a question ?

i have a tape voice recording to clean up

may i know the right approach ?

1) use spectral view and select the noise for NR

2) use noise reduction NR using Shift+P , with no aggressive parameters and run it several times

might you suggest the good parameters not aggressive?

and avoid the automatic noise reduction like sound remover and the adatptive noise reduction

thanks