CMD 454 Lecture Notes - Lecture 2: Lip Reading, Speech Perception, Sound Pressure
21 Feb 2017
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Document Summary
Speech is a complex signal: frequency and intensity: frequency. Most important info for speech found between 400-3000hz (cid:498)speech frequencies(cid:499) (cid:523)on audiogram(cid:524) = 500-2000hz. Ordinary conversational speech sounds = intensity range of 30 db from: intensity 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 frequencies. Relative intensity among different frequency areas of speech = speech spectrum. Formants represent bands of energy: formants also distinguish one vowel from another the mouth) Nasal sounds are very low pitched (easiest for deaf people to hear) Vowels contain high energy; generally lower frequency than consonants. Vowels are more low frequency (low pitch) The softest sounds are the (cid:498)high frequency consonants(cid:499): s, th, voiced th, f (cid:523)very visible on. Process of speech perception understanding and comprehension of speech is complex.
