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I would suggest that ambience is the neutral sound of the room, and that to measure it you would need to find a perfectly quiet section of the recording and then remove any perturbations in the recording (i.e. surface noise, clicks and  pops). Once you have isolated the 'sound' of the room, you can determine the peak and averaage levels. Is this what you mean by 'measuring the ambiance'? 

    On Monday, October 24, 2016 2:15 PM, John Haley <[log in to unmask]> wrote:
 

 I have used Izotope's Dereverb feature, and it works great, at least some
of the time.  It is deceptively easy to use.  I believe how it works is
measuring the strength and timing of first, second, third, etc.
reverberations occurring naturally in the performing space, or as added by
fake reverb, as the sound bounces back to the recording mic.  It can cancel
some of that out.  Like many things, it works the best on sources that need
it the least, and if used too aggressively, it creates unacceptable
artifacts, basically crapping out the sound.  It can also dry up the sound
too much if overapplied.  So it requires some discretion and
experimentation.  But it has proved extremely useful in lessening bad
reverb or echo, helping to clarify recordings that are awash in echo or
reverb.  It works on mono recordings just as well as stereo.

Best,
John Haley



On Mon, Oct 24, 2016 at 2:43 PM, Marcos Sueiro Bal <[log in to unmask]> wrote:

> iZotope's RX4 has something called "deReverb", although I have not tried
> it.
>
> https://rxcookbook.izotope.com/reducing-reverb-rx-de-reverb-module
>
> Marcos Sueiro Bal
> Senior Archivist, New York Public Radio
> 646 829 4063
>
> -----Original Message-----
> From: Association for Recorded Sound Discussion List [mailto:
> [log in to unmask]] On Behalf Of Steven Smolian
> Sent: Monday, October 24, 2016 2:37 PM
> To: [log in to unmask]
> Subject: Re: [ARSCLIST] Ambience
>
> Ambience of the room.
>
> Steve
>
> -----Original Message-----
> From: Association for Recorded Sound Discussion List [mailto:
> [log in to unmask]] On Behalf Of Lou Judson
> Sent: Monday, October 24, 2016 2:21 PM
> To: [log in to unmask]
> Subject: Re: [ARSCLIST] Ambience
>
> Are you meaning signal to noise? Or the ambience of the room it was
> recorded in?
>
> <L>
> Lou Judson
> Intuitive Audio
> 415-883-2689
>
> On Oct 24, 2016, at 10:27 AM, Steven Smolian <[log in to unmask]> wrote:
>
> > I don't know of any but want to be sure that this attribute falls into
> > audio's "unmeasurables."
> >
> > Stereo creates so many ways of blurring sonic information that  a
> > channel comparative tool might be possible but unreliable- different
> > ways of isolating instruments, artificial reverb, etc.  But mono?  I'm
> > thinking particularly of acoustically recorded 78s.
> >
> > Steve
>