EPG bidimensional data reduction

Noel Nguyen
1995 International journal of language and communication disorders  
A new method of electropalatographic (EPG) data reduction is proposed. It uses the so-called discrete cosine transform for representing an EPG pattern as a weighted sum of elementary \pictures". We show that several of these pictures can be considered as being articulatorily relevant. The respective contributions of these pictures to the spatial arrangement of the linguo-palatal contacts are given by transform coe cients which are used here as a set of new EPG indices: the scaled sum of
more » ... index (SSU), the left-right asymmetry index (LRA), the alveolar-palatal index (APA), and the lateral-median index (LME). It is shown that the information extracted from an EPG pattern by means of these indices is maximized. Because of its robustness, our method could be usefully employed in studies on articulatory disorders. key words: electropalatography, data reduction, articulatory parameter 3
doi:10.3109/13682829509082528 fatcat:le4mywkn4jao5huesq3d7e5cty