What is auditory phonetics?

Phonetics is a study of speech sound. Acoustic phonetics is a sub-sector of it. Acoustic phonetics is a study of physical aspects of speech sounds. Speech goes away as the speech sounds come out of your mouth unless you record the speech. Thus, we record speech sounds for analysis. Acoustic phonetics includes study of fundamental frequency (pitch), amplitude/intensity (loudness), duration (length), formant estimates, and other physical aspects of speech sounds.