Index of /~echew/papers/SMC2005

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 cstz-smc05_final.pdf    10-Jan-2006 10:58  796K  
 reference.txt           10-Jan-2006 11:05  465   

In this directory are the PDF file for the paper titled:

"SEGMENTAL TEMPO ANALYSIS OF PERFORMANCES IN USER-CENTERED EXPERIMENTS 
IN THE DISTRIBUTED IMMERSIVE PERFORMANCE PROJECT"

by Elaine Chew, Alexander Sawchuk, Carley Tanoue, and Roger Zimmermann
({echew, sawchuk, ctanoue, rzimmerm}@usc.edu)

The paper was presented at the 
Sound and Music Computing '05 Conference
November 24-26, 2005, Salerno, Italy.

The paper appears in the Proceedings of the
Sound and Music Computing '05 Conference

The presentation took place 4:40PM on Nov 25 at the University of Salerno
The conference website was at http://www.smc05.unisa.it
The conference program was at http://www.smc05.unisa.it/program.asp

COMPLETE PAPER
Click on cstz-smc05_final.pdf if you wish to view the paper in PDF format.

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"SEGMENTAL TEMPO ANALYSIS OF PERFORMANCES IN USER-CENTERED EXPERIMENTS 
IN THE DISTRIBUTED IMMERSIVE PERFORMANCE PROJECT"

by Elaine Chew, Alexander Sawchuk, Carley Tanoue, and Roger Zimmermann
({echew, sawchuk, ctanoue, rzimmerm}@usc.edu)

ABSTRACT: In this paper we present a quantitative analysis of
performer-based experiment data in the Distributed Immersive
Performance Project. The experiments explore the effects of auditory
latency on musical ensemble and interpretation in order to determine
the thresholds for usability. We propose two measures -- the segmental
tempo difference and the segmental tempo ratio from a baseline
performance -- as objective quantifiers of performance strategies. Our
earlier analyses of qualitative reports showed that the usability
threshold lies between 50 and 75 ms. We demonstrate that the proposed
analyses of the performance data, captured in MIDI format, lead to
results similar to the reports. The tempo difference and tempo scaling
across logical segments of the piece show marked increase in
variability when the auditory delay is in the range of 50 to 100 ms
(for two examples) and 50 to 75 ms (for the most rapid example). The
span of the tempo difference and ratio values at latency 150 ms is
less than that around the usability thresholds. We surmise that around
the threshold, the users attempt numerous performance strategies to
compensate for the delay; at latencies far above the threshold, such
strategizing fails and the performers revert to more stable practiced
norms. These findings indicate that segmental tempo difference and
ratio analyses are useful indicators of performance decisions, and
that quantitative analysis of performance data may be a viable way of
evaluating the psychophysical effects of collaborative performance
under various immersive conditions.