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Hearing Acoustics, Perception, Anatomy & Physiology
N/A
11
Communication
Undergraduate 1
11/16/2009

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Cards

Term
Incidence of hearing loss
Definition
about 120 million worldwide
almost 1 in 10 individuals in US
40% of the people are younger than 65
Term
Soundwaves
Definition
sound starts as vibration of a source. Vibrations travel in waves and the waves move through a medium and repeat in cycles of Compression and Rarefaction
Term
Wave Motion
Definition
Simple harmonic motion. Sound waves oscillate and can be described as a periodic disturbance propagated through an elastic medium.
Term
displacement in wave motion
Definition
direction of vibration of the medium. amplitude & direction.
Term
propagation in wave motion
Definition
relative to the direction in which the wave is moving
Term
transverse waves
Definition
Term
Longitudinal waves
Definition
Term
Frequency of a wave
Definition
rate of a wave vibration. Cyclas per second. frequency = 1/period. also measured in Hertz. Humans can generally hear 20-20,000 Hz. 125-6,000 Hz most important for speech. Frequency is perceived as pitch.
Term
Intensity of a wave
Definition
amplitude or strength of the sound vibration. measured in decibels (dB) but 0 dB does NOT indicate the absence of sound. Intensity is perceived as loudness.
Term
Period of a wave
Definition
time it takes to complete one cycle
Term
Wavelength
Definition
distance traveled in one cycle
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