minimal audible change of SPL-increase (at)

Subject: minimal audible change of SPL-increase
From:    at <Andreas.HellmannRUBA.RZ.RUHR-UNI-BOCHUM.DE>
Date:    Wed, 19 Apr 1995 15:05:50 +0200

Dear colleagues,

I am searching for measurements or estimates of the minimal
audible change of the increase rate of the SPL of a sound.
On which factors does it depend that a listener can perceive,
that the SPL-increase of a sound is changing (increasing)?

Thanks in advance!
Andreas