stage in language perception.ppt

Stage1 Auditory Stage Auditory Stage Background knowledge Spectrogram Acoustic cue Spectrogram One of the most common ways of describing the acoustical energy of speech sounds is called a sound spectrogram. It is produced by presenting a sample of speech to a device known as a sound spectrograph, which consists of a set of filters that analyze the sound and then project it onto a moving belt of phosphor,producing the spectrogram. Spectrogram Acoustic cues The speech sound signal contains a number of?acoustic cues?that are used in speech perception. The cues differentiate speech sounds belonging to different?phonetic?categories. VOT（see you next stage*^__^*） Acoustic cues Auditory Stage The auditory stage is based directly on the physical input,and is the initial point at which we take in the raw speech signal ,with its acoustic attributes of frenquency,intensity, and time span. vowel acoustic cues consonant (not all) Speech synthesis by mechines Stage2 Phonetic Stage Background knowledge Michael Studdert Kennedy Motor theory of speech perception Michael Studdert Kennedy psychologist and speech scientist Professor of?Psychology?at the?University of Connecticut Contributions：?speech perception motor theory of speech perception ?evolution of language Motor Theory of speech perception proposed in the?Haskins Laboratories?in the 1950s by?Alvin Liberman?and?Franklin S. Cooper developed further by?Donald Shankweiler,Michael studdert Kennedy?,??Carol Fowler?and?Douglas Whalen Motor Theory of speech perception The?motor theory of speech perception?is the hypothesis that people?perceive?spoken words?by identifying the?vocal tract?gestures with which they are pronounced rather than by identifying the?sound?patterns that speech generates. Motor Theory of speech perception It originally claimed that speech perception is done through a specialized?module?that is?innateand human