ASU SHS 311 UNIT 1.
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Most animals have what kind of sense? - Answer: Hearing
Evolutionary view of hearing - Answer: Detection of objects → Discrimination among
different types of sounds → Segregation of sounds from different objects
What is hearing good for? - Answer: navigation
Find prey
Avoid predators
Communication
Aesthetic qualities (music)
Parts involved in hearing - Answer: Sound
Receptor
Brain
Sensations and Perceptions
What two properties does an object need to vibrate? - Answer: Inertia and elasticity
Inertia - Answer: the resistance of an object to any change in its state of motion
Elasticity - Answer: the restoring property of an object to return to its resting state
Vibration-Mass and Spring model - Answer: Mass = inertia
Spring = elasticity
Equation to describe mass motion - Answer: d(t) = Asin({2πft} + θ)
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, D(t) - Answer: displacement as a function of time (t)
A - Answer: (peak) Amplitude, distance of max. Movement/amount of displacement
F - Answer: Frequency, number of cycles per second
F = 1/p, p in seconds
F = 1000/p, p in msec.
The higher the period, the lower the frequency
Θ - Answer: starting phase, relative starting position
Three parameters of sound - Answer: amplitude (A)
Frequency (f)
Starting phase (θ)
Cycle - Answer: one complete oscillation of vibration
Period - Answer: time to complete one cycle
Peak amplitude - Answer: the maximum distance moved in the positive direction
Peak-to-peak amplitude - Answer: the total distance moved from maximum negative
position to maximum positive position
Rms - Answer: root mean squared amplitude
√{[∑(d)²]/n}
APPHIA – Crafted with Care and Precision for Academic Excellence.
2
From question to perfection| Study with confidence!
Most animals have what kind of sense? - Answer: Hearing
Evolutionary view of hearing - Answer: Detection of objects → Discrimination among
different types of sounds → Segregation of sounds from different objects
What is hearing good for? - Answer: navigation
Find prey
Avoid predators
Communication
Aesthetic qualities (music)
Parts involved in hearing - Answer: Sound
Receptor
Brain
Sensations and Perceptions
What two properties does an object need to vibrate? - Answer: Inertia and elasticity
Inertia - Answer: the resistance of an object to any change in its state of motion
Elasticity - Answer: the restoring property of an object to return to its resting state
Vibration-Mass and Spring model - Answer: Mass = inertia
Spring = elasticity
Equation to describe mass motion - Answer: d(t) = Asin({2πft} + θ)
APPHIA – Crafted with Care and Precision for Academic Excellence.
1
, D(t) - Answer: displacement as a function of time (t)
A - Answer: (peak) Amplitude, distance of max. Movement/amount of displacement
F - Answer: Frequency, number of cycles per second
F = 1/p, p in seconds
F = 1000/p, p in msec.
The higher the period, the lower the frequency
Θ - Answer: starting phase, relative starting position
Three parameters of sound - Answer: amplitude (A)
Frequency (f)
Starting phase (θ)
Cycle - Answer: one complete oscillation of vibration
Period - Answer: time to complete one cycle
Peak amplitude - Answer: the maximum distance moved in the positive direction
Peak-to-peak amplitude - Answer: the total distance moved from maximum negative
position to maximum positive position
Rms - Answer: root mean squared amplitude
√{[∑(d)²]/n}
APPHIA – Crafted with Care and Precision for Academic Excellence.
2
