A plosive is a consonant sound produced by stopping the airflow in the vocal tract.
1. Aerodynamic is the study of motion of air . During speaking , we move air through the speech production system and the air movements are therefore a useful means of representing the process of speech production . Change in the shape and size of lower airway produce an airstream which is continuously modified by laryngeal and supra laryngeal structures . The movement of air through respiratory tract is governed by physical forces and controlled by neural and chemical events .
2. Acoustic theory of speech production - Complex tone produced by vibration of VF is shaped into speech sounds by the vocal tract
>The speech-production mechanism may be considered an aerodynamic mechanical sound generator.
>Within this context, the VP port functions to emphasize the dichotomy between the aerodynamic-mechanical and the acoustic aspects of speech.
>If the VP port is closed, the oral cavity is an efficient generator capable of producing sounds without an air leak.
>If the VP port is open, sounds and air (pressure) are directed through the nasal cavity - this opening also changes the acoustic characteristics of the vocal tract and creates two air-filled resonating cavities that are acoustically coupled.
35.Outline the sequence of aerodynamic events associated with plosive production. 36.Outline the sequence of acoustic events...
47.Apply the principles of plosive production to clinical disorders. 48. Outline the articulatory and aerodynamic and acoustic events for typical fricative production. 49.Describe the different sound sources associated with fricative production.
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