I have tried using the distortion removal feature of Izotope RX3 Advanced,
and I assume that its utility depends a lot on what the source is. On what
I was using it for, distorted female vocal caused by a too high recording
level, after a good deal of effort I could not achieve any improvement
without really killing the sound. It is supposed to separate the "noise"
elements from the pure musical tones in a given musical source, and it
probably does work well on certain things. Others may have had success
with it on other material. It's worth a try.
Best,
John Haley
On Wed, Oct 1, 2014 at 9:19 AM, seva, soundcurrent mastering <
[log in to unmask]> wrote:
> MAG had commented that the most difficult instruments were the trombone and
> mallet instruments. when they got just a bit excited in performance their
> peak values could be wildly higher than soundcheck. he said that the
> asymmetrical waveform aspects were part of this.
>
> bob orban and others use allpass filters to serve as a phase rotation to
> reduce the asymmetry in voices before radio station processing. of course
> it can be used prior to any such extreme peak limiting situation.
>
>
>
> but back to his question: i've found RX3 capable of more distortion repair
> than i expected; one must use rather extreme settings, and often, iterative
> processing to "get there". takes a careful touch...
>
>
>
>
>
> On Wed, Oct 1, 2014 at 8:40 AM, Bruce Whisler <[log in to unmask]> wrote:
>
> > It is definitely distortion, as the performer is not using a mute. I
> > believe it is likely slew rate limiting, now that I have read the article
> > that John Chester shared.
> >
> > Bruce Whisler
> >
> > -----Original Message-----
> > From: Association for Recorded Sound Discussion List [mailto:
> > [log in to unmask]] On Behalf Of Don Cox
> > Sent: Wednesday, October 01, 2014 7:16 AM
> > To: [log in to unmask]
> > Subject: Re: [ARSCLIST] Distortion question
> >
> > On 30/09/2014, Ellis Burman wrote:
> >
> >
> > > I see this all the time in my film work, where I can see the clipping,
> > > but it is in the downward sloping portion of the waveform, instead of
> > > at the peaks. Once this happens, de-clippers are pretty much useless.
> > > For short sections of this type of distortion, I sometimes have luck
> > > by individually interpolating each cycle of the waveform over the
> > > clipped portion, using Sonic Solutions B or D type interpolations. It
> > > takes a while, but can sometimes work quite well. I have tried this
> > > with the spectral interpolator in RX by selecting the entire frequency
> > > range, with no success. I have had some success with decrackling
> > > interpolators (Sonic Solutions E-type) or RX de-crackler, but the
> > > spikes in a muted trumpet are often mis-interpreted as crackle, and
> > > often removed, making the distortion worse or causing low frequency
> > > artifacts, so distortion removal from a trumpet recording, especially
> > > muted trumpet, is nearly impossible.
> >
> > Which raises the question, how do you know it is distortion and not just
> > an unusual mute ?
> >
> > Regards
> > --
> > Don Cox
> > [log in to unmask]
> >
> >
>
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