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