Phonetics - Unit Two - Lesson No. 11
In double articulation, there are two simultaneous articulation of the same rank. That is, these two articulations are of the same degree of stricture, hence: stop + stop, fricative + fricative or approximant + approximant.
Stop + stop double articulation
In this type of double articulation, the back of the tongue is simultaneously placed against the soft palate to form a velar stop [k], and the lip is closed (to form a bilabial stop [p]). The resultant sounds are [p͜k] or [k͜p]. The ligature [͜] shows that the articulations are simultaneous, during which a pulmonic pressure is built up behind it. If saying a vowel after these two sounds, the resultant will be [p͜ka], and it is a bilabial + velar stop.
Fricative + fricative double articulation
It can take place when forming strictures of air for the sounds [f] and [s], as in [fs], or in the case of [f] and [x]. It is noticed that it is rather difficult to generate fricative turbulence simultaneously at both stricture locations. That is probably why co-ordinate fricative + fricative coarticulation is virtually non-existent in languages.
Approximant + approximant double articulation
This type of articulation is quite easy. Take the sound [w] as an example. When it is prolonged, it will feel like a [w] and [u]. Try to say “what” with prolonged [w]. It will feel like you are saying [wuat]. All pharyngeal articulation are regarded as secondary to any simultaneous oral articulation, and finally, any approximant type of articulation accompanying a lateral approximant is always regarded as secondary. Therefore, an alveolar lateral approximant [l] with a simultaneous palatal approximant [i] coarticulation would always be called a palatalized alveolar approximant and never an alveolar-lateralized palatal approximant.