Modeling tongue-palate contact patterns in the production of speech

Previous studies on lingual movements in speech have led to the assumption that the tongue can be divided into a small number of functional blocks. This work was aimed at finding out whether subdivision into independent components may also be observed in patterns of tongue-palate contacts, as revealed by electropalatography (EPG). An attempt was made to reduce EPG data to a small number of articulatorily relevant parameters in an empirical way, and to model the configuration of the linguo-palatal contacts in speech as a combination of these parameters. Our corpus was composed of ten natural sentences recorded by two female native speakers of French. EPG data reduction was first performed by a feedforward multilayer neural network, and then by factor analysis. The results showed that variation in the tongue-palate contact pattern mainly occurred along two dimensions, related to lingual contacts in (1) the alveolar region, and (2) the palatal region, respectively. These results were consistent for both subjects, and provided evidence for the hypothesis that the tongue tip/blade and the tongue dorsum are two independently controllable articulators. In a second step, potential applications of this empirical model to studies of coarticulation and timing are illustrated through a pilot investigation of /kl/ clusters. Finally, implications of our work for a comprehensive model of tongue movements are discussed.

[1]  H. Harman.  Modern factor analysis , 1961 .

[2]  B. J. Winer.  Statistical Principles in Experimental Design , 1992 .

[3]  S. Öhman.  Coarticulation in VCV Utterances: Spectrographic Measurements , 1966 .

[4]  J. Perkell.  Physiology of speech production: results and implications of a quantitative cineradiographic study , 1969 .

[5]  Richard A. Harshman,et al.  Factor analysis of tongue shapes. , 1971, The Journal of the Acoustical Society of America.

[6]  William J. Hardcastle,et al.  Physiology of speech production: An introduction for speech scientists , 1976 .

[7]  D J Ostry,et al.  Computerized measurement of tongue dorsum movements with pulsed-echo ultrasound. , 1983, The Journal of the Acoustical Society of America.

[8]  R. R. Clarke.  Transform coding of images , 1985 .

[9]  William J. Hardcastle,et al.  Some phonetic and syntactic constraints on lingual coarticulation during /kl/ sequences , 1985, Speech Commun..

[10]  W. Kier,et al.  Tongues, tentacles and trunks: the biomechanics of movement in muscular‐hydrostats , 1985 .

[11]  Geoffrey E. Hinton,et al.  Learning internal representations by error propagation , 1986 .

[12]  Elliot Saltzman,et al.  The dynamical perspectives on speech production: Data and theory , 1986 .

[13]  Richard P. Lippmann,et al.  An introduction to computing with neural nets , 1987 .

[14]  R. Lippmann,et al.  An introduction to computing with neural nets , 1987, IEEE ASSP Magazine.

[15]  W. Hardcastle,et al.  New developments in electropalatography: A state-of-the-art report , 1989 .

[16]  Kurt Hornik,et al.  Neural networks and principal component analysis: Learning from examples without local minima , 1989, Neural Networks.

[17]  Christian Lebiere,et al.  The Cascade-Correlation Learning Architecture , 1989, NIPS.

[18]  William J. Hardcastle,et al.  Cross-language investigation of lingual coarticulatory processes using EPQ , 1989, EUROSPEECH.

[19]  Daniel Recasens,et al.  The articulatory characteristics of palatal consonants , 1990 .

[20]  Shinji Maeda,et al.  Compensatory Articulation During Speech: Evidence from the Analysis and Synthesis of Vocal-Tract Shapes Using an Articulatory Model , 1990 .

[21]  Maureen C. Stone.  Toward a model of three-dimensional tongue movement , 1991 .

[22]  L. Raphael,et al.  Cross-sectional tongue shape and linguopalatal contact patterns in [s], [∫], [f], and [1] , 1992 .

[23]  Osamu Fujimura,et al.  Allophonic variation in English /l/ and its implications for phonetic implementation , 1993 .

[24]  W. Hardcastle,et al.  Temporal and Spatial Aspects of Lingual Coarticulation in /kl/ Sequences: A Cross-Linguistic Investigation , 1993, Language and speech.

[25]  A Marchal,et al.  Accor: Instrumentation and Database for the Cross-Language Study of Coarticulation , 1993, Language and speech.

[26]  A. Marchal,et al.  Regenerating the spectral shapes of [s] and [∫] from a limited set of articulatory parameters , 1994 .

[27]  N. Nguyen.  EPG bidimensional data reduction. , 1995, European journal of disorders of communication : the journal of the College of Speech and Language Therapists, London.