Waveform and spectrogram of the Amharic (Ethiopia) word [tʷʼaf] wax taper. The initial consonant is a labialised alveolar ejective stop.  Notice the change in frequency of the first formant at the beginning of the vowel.
 

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Michael Ashby & John Maidment

Introducing Phonetic Science

Chapter 8: Speech sounds and speech movements

Chapter Summary

In this chapter we look at the articulation of speech sounds in more detail.  We see that sounds may have more than one constriction.  Common secondary articulations are labialisation, palatalisation, velarisation and pharyngealisation. The articulation of all sounds is likely to be influenced by the context in which they appear.  Examples of such influence are: the addition of a secondary articulation to a sound, the fine adjustment of the place of articulation, the addition of nasalisation,  or variations in duration.   The chapter also introduces diagrams showing the activity of articulators as a good way of indicating the co-ordination of speech movements.