The sixth-order wave equation governing the propagation of one-dimensional acoustic waves in a viscous, heat conducting gaseous medium subject to relaxation effects has been considered. It has been reduced to a system of lower order equations corresponding to the finite speeds occurring in the equation, following a method due to Whitham. The lower…

In this paper we report on an adult male participant with a rare form of progressive speech degeneration. We present acoustic phonetic data on his vowel and consonant production, and describe his prosody and syllable structure. We suggest possible phonological analyses of his speech, concluding that a gestural approach to phonology best…

The terms "fortis" and "lenis" are variously regarded as having one single underlying phonetic correlate or many. An exploratory analysis of acoustic and aerodynamic data on contrasting stop series in a number of European and non-European languages confirms that a significant variation in peak intra-oral pressure and in articulatory stricture…