Audio Engineering Society Convention Paper Presented at the 125th Convention 2008 October 2–5 San Francisco, CA, USA The papers at this Convention have been selected on the basis of a submitted abstract and extended precis that have been peer reviewed by at least two qualified anonymous reviewers. This convention paper has been reproduced from the author's advance manuscript, without editing, corrections, or consideration by the Review Board. The AES takes no responsibility for the contents. Additional papers may be obtained by sending request and remittance to Audio Engineering Society, 60 East 42 nd Street, New York, New York 10165-2520, USA; also see www.aes.org. All rights reserved. Reproduction of this paper, or any portion thereof, is not permitted without direct permission from the Journal of the Audio Engineering Society. Quantifying the strategy taken by a pair of ensemble hand-clappers under the influence of delay Nima Darabi 1 , Peter Svensson 1 , and Snorre Farner 2 1 Centre for Quantifiable Quality of Service in Communication Systems * , NTNU, Trondheim, O.S. Bragstads plass 2E, NO-7491, Norway darabi@q2s.ntnu.no svensson@q2s.ntnu.no 2 IRCAM, Analysis/Synthesis Group, Paris, 1 place Igor Stravinsky, FR-75004 , France farner@ircam.fr ABSTRACT Pairs of subjects were placed in two acoustically isolated rooms clapping together under an influence of delay up to 68 ms. Their trials were recorded and analyzed based on a definition of compensation factor or CF. This parameter was calculated from the recorded observations for both performers as a discrete function of time and thought of as a measure of the strategy taken by the subjects while clapping. Increasing the delay CF was shown to be increased linearly as it is desired to avoid tempo decrease for such high latencies. Theoretically a critical value for CF was defined as tempo over measure (or beat) duration and was used to explain why very short latencies may lead to a tempo acceleration in accordance with Chafe effect. * Centre for Quantifiable Quality of Service in Communication Systems, Centre of Excellence appointed by The Research Council of Norway, funded by the Research Council, NTNU, and UNINETT. http://www.ntnu.no/Q2S/