CMD 454 Lecture Notes - Lecture 2: Lip Reading, Speech Perception, Audiogram
Document Summary
Most important info for speech found between 400-3000 hz (cid:498)speech frequencies(cid:499) on audiogram = 5(cid:882)(cid:882)-2000 hz. Ordinary conversational speech sounds = intensity range of 30 db: intensity from softest to loudest sound. This 30 db range must be audible to the listener in the speech frequencies in order to understand speech. Overall intensity of speech is variable at any given moment among areas of frequency spectrum. Relative intensity among different frequency areas of speech = speech. Speech spectrum plot of phonemes in english according to their frequency and intensity. Formants represent bands of energy: formants also distinguish one vowel from another. Vowels contain high energy; generally lower frequency than consonants. Place of articulation: labiodental, bilabial, linguadental, alveolar, palatal, glottal. Manner of articulation: stop/plosive, fricative, affricate, nasal, liquids/glides. Nasal sounds are very low pitched (easiest for deaf people to hear) Human ear has ability to detect frequencies from: Human ear has ability to detect intensities from:
