11-17-11 Speech Perception

11-17-11 Speech Perception - PSY402 Sensation and...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
PSY402 Sensation and Perception November 17, 2011 Speech Perception Vocal cords and vocal tract Air pushed up from lungs through vocal cords into vocal tract o Vocal cords : Vibrating strings o Vocal tract : Body of string instruments (provides resonance) Male vocal cords 17-25 mm Female vocal cords 12.5-17.5 mm The acoustic signal Vowels : Vibration of vocal cords and change in shape of vocal tract by moving articulators (lips, tongue, teeth, jaw) o Changes in shape causes changes in resonant frequency and produces peaks in pressure at a number of frequencies called formants Consonants : Produced by constriction of vocal tract Speech spectrogram Frequency on y-axis Time on x-axis Darkness=amplitude C.f. frequency spectrum (no time) Formants show up as bands of dark area Formant transitions : Rapid changes in frequency preceding or following consonants Basic units of speech Phoneme: Smallest unit of speech that changes meaning of a word o 47 phonemes in English o Hawaiian – 11, some African languages – 60 Phonemes and acoustic signal o Variability problem : No simple correspondence between acoustic signal and individual phonemes o Variability comes from phonemes context
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 4

11-17-11 Speech Perception - PSY402 Sensation and...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online