branches of Phonetics :
Phonetics has three branches:
1) Acoustic phonetics studies the physical properties of sounds made by the vocal tract. It looks at the air wave frequencies of which sounds consist. Computer programs are used to transform the sound waves to what is known as spectrum. The outputs of these programs which measure and record speech sounds are recognized as sound spectograms
2) Auditory phonetics studies how the human ear perceives sounds and how the human brain recognizes and interprets them as distinctive units.
3) Articulatory phonetics is the study of the production of sounds are by the vocal tract. It looks at the place and manner of articulating speech sounds. It also explains how sounds can be combined together to form words. Articulatory phonetics is the main focus of this book. When thinking of articulatory phonetics, it will always be helpful to think of anatomical features of the vocal tract .
Introduction : Introduction to linguistics : branches of  Phonetics
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branches of  Phonetics :
1) Acoustic phonetics studies the physical properties of sounds made by the vocal tract.
2) Auditory phonetics studies how the human ear perceives sounds and how the human brain recognizes and interprets them as distinctive units.
3) Articulatory phonetics studies the production of single sounds by the vocal tract.