Acoustics Flashcards
Acoustics
Study of physical properties of sound
physical sound
frequency
intensity
timing
sensation of vibration
perception sound
auditory interpretation
how you experience sound in your brain
need physical sound
Waves
succession of molecules being shoved together and pulled apart
moving back and forth
compression/condensation
shoved together
rarefaction
pulled apart
transverse waves (perpendicular)
up and down
longitudinal waves (parallel)
back and forth
sound traveling through the ear
waveforms
(amplitude and time)
one complete compression and one complete rarefaction
cycle
amplitude
greatest distance the mass goes from resting position
peaks
compression
all squished together
simple sounds
all energy at one frequency
complex sounds
energy at more than one frequency
frequency
cycles/second
Measured in hertz
how fast does sound travel
340 m/sec through medium of air
wavelength formula
v/f
velocity
speed of which sound travels
340 m/sec
period
time required for each cycle
time/cycles or 1/frequency
higher pitch =
more cycles per second
2000 hz: how many cycles per second?
2000 cycles/second
2000 hz: how long does it take for one cycle to occur?
1/2000 seconds
length
as length increase, frequency decreases
mass
as mass increases, frequency decreases
stiffness
the flexibility of a mass
as stiffness increases, frequency increases
