finin@prc.unisys.com (Tim Finin) (03/03/90)
AI SEMINAR UNISYS CENTER FOR ADVANCED INFORMATION TECHNOLOGY (formerly Unisys Paoli Research Center) Formalizing Knowledge used in Spectrogram Reading: Acoustic and perceptual evidence from stops Lori F. Lamel IBM France An evaluation of spectrogram reading was conducted to obtain a better understanding of the process of reading spectograms, to evaluate the ability of spectrogram readers. This talk has three parts: an evaluation of spectrogram readers on a constrained task, a comparison to listeners on the same task, and a formalization of spectrogram-reading knowledge in a rule-based system. A knowledge-based system for identifying stop consonants was developed. The framework was chosen because the expression and use of the knowledge is explicit. The emphasis was on capturing the acoustic descriptions and modeling the reasoning thought to be used by human spectrogram readers. However, the implemention was much harder than had been anticipated due to a variety of reasons. The most important is that there appears to be much more happening in our visual system and in our thought processes than we actually express, even when asked to explain our reasoning. Humans are able to selectively pay attention to acoustic evidence, even in the presence of contradictory evidence. This ability is not well understood, and is difficult to mimic. 11:00 am Monday, March 5, 1990 CAIT Conference Room Unisys Center for Advanced Information Technology Great Valley Laboratories #1 70 E. Swedesford Road Paoli PA 19301 -- non-Unisys visitors who are interested in attending should -- -- send email to finin@prc.unisys.com or call 215-648-2480 -- -- Tim Finin finin@prc.unisys.com Center for Advanced Information Technology 215-648-2840, 215-648-2288 (fax) Unisys, PO Box 517, Paoli, PA 19301 215-386-1749 (home)