PSYC3331 Lecture Notes - Lecture 5: Phoneme, Cohort Model, Categorical Perception
How the physical (acoustic) signal is translated into its perceptual (auditory) interpretation
Sound wave: Intensity mapped against time. Frequency is width of up
-
down cycle
Spectrogram produced by a sound spectrograph: Frequency mapped against time. Intensity is darkness
Are there acoustic features that are equivalent on a one
-
to
-
one basis with auditory features?
Look at spectrogram which depicts the acoustic signal:
Frication reflected in diffuse energy across time across a range of frequencies
Vowels
--
> Formants: bands of high energy at several different frequencies
Relationship between F1 and F2 important in determining which vowel it is
Speech recognition
Sunday, 17 June 2018 5:55 PM
Lecture 4 Page 1
Document Summary
How the physical (acoustic) signal is translated into its perceptual (auditory) interpretation. Spectrogram produced by a sound spectrograph: frequency mapped against time. Look at spectrogram which depicts the acoustic signal: Frication reflected in diffuse energy across time across a range of frequencies. Vowels --> formants: bands of high energy at several different frequencies. Relationship between f1 and f2 important in determining which vowel it is. F2 is close to horizontal for /bae/ but begins with a steep downward transition for /gae/ So, considerable invariance between physical signal and the way it is perceived, but not always. In fact it"s the stop consonants that are particularly problematical because the formant transition that leads to the perception of a particular stop consonant depends on the vowel. There"s a complex interaction between the initial consonant and the vowel, meaning that it is hard to identify the features in the acoustic signal that translate directly into their auditory percept.
