Class notes
Audion (complete)
- Course
- NEU 101 (NEU101)
- Institution
- Arizona State University
Unit 3 lectures 4 & 5, complete rendition of Shannon Eatons audio unit
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Audition 1Vision reminders
Tuning curve: the visual cortex is organized in lines instead of donuts
Sound
Sound wave: the pattern of air pressure changes
Compression: higher levels of local air pressure
Rarefaction: lower levels of air pressure
Is a Longitudal (parallel to wave direction) waves
Wavelength: Distance between peaks
Physical aspects
Amplitude: how large the peaks are
Loudness
Frequency: how close together the waves are (how frequency each wave is)
gives us pitch
Complexity: How smooth the wave is
Timbre
Measuring AMpllitude
Uses decibels
Scale is logarithmic (so we can plot giant and small numbers on same graph)
0-60 is comfortable, 60-80 is annoying, 80-120 extremely loud, 120-140
painful, 140-170 intolerable, 170-194 deadly
Measuring Frequency (pitch)
uses Hertz (Hz) or cycles per sound
Audition 1 1
, how many waves are in 1 second or cycle
and hand on a clock ticks at 1hz
Measuring Complexity (Timbre)
simple wave vs complex wave
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Types of sound
Ultraviolet: above 20,000hz, frequency too high
Infrared: slower wave lengths we can’t hear, below 20-30 hz
Ultrasound: sound we cannot hear that is very high frequency
Anatomy of the ear
Outer: Part we can see
Pinna
the auditory canal
all the way up to the ear drim
Middle: Bone structures
amplify and transmit compression of air
Inner ear:
cochlea & Semicircular canals
Outer Ear
Pinna: Part that is outside of the head
Audition 1 2
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