ISO Clip/distortion software

Archived from groups: rec.audio.pro,rec.arts.movies.production.sound, (More info?)

Hi,

Somewhere I remember reading about a software program that would "analyze" a
clipped audio file, pull it down and redraw the tops.

I have a Pro Tools plugin that tries, but really does not do the job. Does
anyone know of the other one and how well it works?

Regards,

Ty Ford

PS: Please email me.

-- Ty Ford's equipment reviews, audio samples, rates and other audiocentric
stuff are at www.tyford.com

Archived from groups: rec.audio.pro,rec.arts.movies.production.sound (More info?)

"Arny Krueger" <arnyk@hotpop.com> wrote in
news:g8udnXVK-Zq64OPcRVn-iw@comcast.com:

> "Ty Ford" <tyreeford@comcast.net> wrote in message
> news:qfSdnbHn7sF87uPcRVn-rg@comcast.com
>> Hi,
>>
>> Somewhere I remember reading about a software program that would
>> "analyze" a clipped audio file, pull it down and redraw the tops.
>>
>> I have a Pro Tools plugin that tries, but really does not do the job.
>> Does anyone know of the other one and how well it works?
>>
>
> Audition/CEP has done this for years. IME, if you tune the availble
> parameters, the redrawn waves look pretty fair, but they don't
> necessarily sound all that good. FWIW, I think that you can use the
> redrawn waves to get some kind of estimate of how much was clipped
> off.
>
>
>

Sonic Foundry's Sound Forge (from Sony now), has a function called
"Clipped Peak Restoration". In version 6, it shipped as part of the
basic product, but is considered a plugin. On my installation it appears
in "DX favorites". I think it was originally sold as a part of the Noise
reduction package of plugins a few versions ago. I believe the current
version has a similar configuration to mine.

As to the results, my perception is that as applied to a fresh (and not
too extreme) "pure clipping" the result is pretty good (at least as
compared to letting it be). However, when I tried it on something which
got soft clipped because someone recorded a cassette tape far too hot,
the result gave little improvement. I think the method used badly needs
the part of the waveform below the clip point to be quite unharmed, as it
bases the reconstruction on that.

Peter A. Stoll
(lurking amateur--watching this group to learn about the SD 722 I plan to
buy to replace my DA-P1)

Archived from groups: rec.audio.pro,rec.arts.movies.production.sound (More info?)

> >
> >
>
> Sonic Foundry's Sound Forge (from Sony now), has a function called
> "Clipped Peak Restoration". In version 6, it shipped as part of the
> basic product, but is considered a plugin. On my installation it appears
> in "DX favorites". I think it was originally sold as a part of the Noise
> reduction package of plugins a few versions ago. I believe the current
> version has a similar configuration to mine.
>
> As to the results, my perception is that as applied to a fresh (and not
> too extreme) "pure clipping" the result is pretty good (at least as
> compared to letting it be). However, when I tried it on something which
> got soft clipped because someone recorded a cassette tape far too hot,
> the result gave little improvement. I think the method used badly needs
> the part of the waveform below the clip point to be quite unharmed, as it
> bases the reconstruction on that.
>

Unless SF sees a really flat-topped waveform @ fullscale it doesn't do
anything at all
to the signal. in my experience. This lets out fixing any sort of
distortion that doesn't result in that waveform, like what you
describe. However, if what you have is a first generation seriously
and visibly clipped waveform, it can do some miraculous things
in saving otherwise unusable audio.

Philip Perkins CAS