LING 330 Chapter Notes - Chapter 9.3: Mcgurk Effect, Formant, Phoneme
25 Jan 2018
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Document Summary
The switch from acoustics to perception is non-linear, meaning changes in frequency and amplitude do not have equal responses in the perceptual system. The just-noticeable difference is the smallest difference between two sounds which can be detected by a listener. These differences can be as small as 2 or 3 hz for tones under 1000 hz, but the non- linearity of acoustic -> perception the just-noticeable difference increases as frequency increases. Frequency values are measured on a logarithmic scale because it is better suited for perception different math transformations include: semitone scale, the bark scale, the mel. Bark scale divides the range of frequencies which can be heard by humans into 24 bands (ranges) (see table 9. 1) When heard, the step from each band to the next sounds about equal. We are constantly perceiving sounds that are different as if they were the same and sounds that are the same as if they were different.
