Second International Conference on Spoken Language Processing (ICSLP'92)

Banff, Alberta, Canada
October 13-16, 1992

Ensemble Averaging Applied to The Analysis of Fricative Consonants

Christine H. Shadle (1), Andre Moulinier (1), Christian U. Dobelke (2), Celia Scully (3)

(1) Department of Electronics and Computer Science, University of Southampton, Southampton, England, UK
(2) Preussen Elektra, Lehrte, Germany
(3) Department of Psychology, University of Leeds, Leeds, England, UK

In an attempt to explain across-subject variability in fricative spectra, ensemble-averaged spectra were compared to time-averaged spectra for a corpus that consisted of nonsense syllables of the form /pViFV2/ repeated 10-14 times on one breath. Vi and V2 were chosen from /a,i,u/; F was one of /f,v,0,, s,z,/,2/. Two subjects were recorded saying both this corpus and another corpus consisting of the same fricatives sustained for 3 seconds. A wide variety of articulatory data was also available for these subjects. An ensemble-averaged spectrum could be computed for the beginning (or middle or end) of all fricative tokens. Results show a pattern of spectral change through the fricative that is consistent with aerodynamic and articulatory measures. The non-stationarity thus revealed does not in itself explain the variability across subjects, however. Rather, the ensemble averaging allows a precision in timing of the analysis window which, when coupled with the articulatory data, shows more clearly the effect of vowel context on fricatives, and delineates the differences between /f/ and /$/.

Full Paper

Bibliographic reference.  Shadle, Christine H. / Moulinier, Andre / Dobelke, Christian U. / Scully, Celia (1992): "Ensemble averaging applied to the analysis of fricative consonants", In ICSLP-1992, 53-56.