Does anybody recognize the origin of this picture? (Pulkki Ville )

Subject: Does anybody recognize the origin of this picture?
From:    Pulkki Ville  <ville.pulkki@xxxxxxxx>
Date:    Tue, 15 Apr 2014 18:40:12 +0000

Hello, I am translating into English (and also updating and broadening the scope) the Finnish book by late Matti Karjalainen on communication acoustics. It will be an introduction various topics in audio, speech, technical audiology and psychoacoustics, meant for e.g. Msc-level teaching in technical universities. Wiley will publish it, hopefully in autumn. There will be about 250 figures and 430 pages. The Finnish book did not mention the origins of the figures. I have been able to find about 100 figures from different papers and books, but I can not find a single figure from anywhere. It is a listening test result about pre- and post-masking thresholds for an impulse probe caused by an impulse masker. In the test the subject has heard a sequence of masking impulses (e.g. with 50 Hz rate), and a test impulse has been presented before or after the masking impulse, and the threshold of audibility has been measured for the test impulse. The figure is here: Any ponters would be appreciated. Grateful for your help! Best, Ville Pulkki Ville.Pulkki@xxxxxxxx Tenure track assistant professor Department of Signal Processing and Acoustics School of electrical engineering Aalto University

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