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speech acoustics
- -how sounds relate to articulators
- -how higher level info is encoded in speech sounds
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speech perception
- -the ear processes speech
- -the brain extracts info about phonemes and suprasegmentals from speech
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Voice Disorders (treatment)
stroboscopic or acoustic analysis of disordered voice; documenting effects of therapy
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neurogenic speech disorders (treatment)
efects of motor speech disorders on production
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craniofacial speech disorders (treatment)
effects of artificial palate on speech production
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hearing impairment (treatment)
speech perception and production by hearing impaired; effects of hearing aids
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accent reduction (treatment)
training speech sound produciton
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Alexander Graham Bell
- -system of visual representation of articulation of speech sounds
- -developed audiometer for testing hearing (and telephone)
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Ralph Potter
- Sound Spectrograph
- -machine for graphical representation of frequencies in speech
- -originally hoped to be a way of making speech visible for the deaf
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the voder/vocoder
- Homer W Dudley
- -purpose: reduce information needed to transmit speech
- -buzz for voice, different bands for other frequencies
- -operated like a piano w/ pedals and keys
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The pattern Playback
- Franklin Cooper
- -reading machine for blind
- -used in study of speech perception
- -led to development of more sophisticated synthetic speech
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Computerized automatic text to speech synthesis
- Dennis Klatt (1980's)
- -reading for blind, aid for handicapped
- -augmentative and alternative communicaiton devices
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sound
- displacement of air molecules that could produce an auditory response
- -perceptual term
- -analyze using acoustics (amplitude, frequency, phase)
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amplitude
plotted along y-axis in pressure (dynes-used for speech) or intensity (watts)
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time
plotted along x-axis in seconds or milliseconds
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Periodic sound wave
waves repeat over and over in exactly the same pattern
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Quasi-periodic sound waves
- waves are those that have a generally repeating pattern but has some small differences on each cycle
- -tuning fork, a solid sound
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aperiodic sound waves
- waves have NO repeating pattern
- -noise, fricatives
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