CSE 115: TEST 1
42 Cards in this Set
Front | Back |
---|---|
Empedocles
|
Implanted air
|
Plato
|
Special air
|
Galen
|
Receptor Organ
|
Vessalius
|
Ossicles
|
Eustachian
|
Tubes
|
Fallopius
|
IE and vestibular
|
Coiter
|
Book, transmission of sound
|
Perrault
|
air in cochlea
|
Contugo
|
fluid in cochlea
|
Muller
|
Nerve energies, see thunder
|
Jannesen
|
Microscope
|
Galileo
|
Resonance Principle
|
Du Verny
|
Ribbon structure
|
Corti
|
rods of corti
|
Helmholtz
|
resonance place- each nerve specific freq
|
Beksey
|
Traveling wave thru basilar membrane
|
Wever
|
freq place theory & volley principle (neuronal summation)
|
Deiter
|
Rods are arches, don't vibrate
|
Resonance Principle
|
(Galileo) High mass-vibrates at low freq
High stiff-vibrates high freq
Resonant freq=mass and stiffness in phase
|
Resonance Place
|
Each rod has natural freq (Helmholtz)
|
Place Theory
|
Each freq activates diff place
Intensity=#impulse/s
|
Frequency Theory
|
(Rutherford)All segments vibrate for every freq
|
Frequency Place
|
Both Freq and Place Theories
Primitive ears use freq
Advanced ears use both place and freq
|
Travelling Wave Theory
|
(Bekesy) Vibration travels from base to apex
|
Ohms Acoustic Law
|
Sound is comprised of pure tones
|
Volley Principle
|
Summation of neural responses
|
Speed of Sound
|
340 meters/second
|
Reference pressure for sound
|
.0002dynes/cm^2 or 20microPa
|
dB=
|
20log(P2/.0002dynes/cm^2)
|
Sine formula
|
Y(Amplitude)=A(radius)sin(360xfreqxtime)
|
Tuning Fork Example
|
At rest:
max kinetic energy
max velocity
min potential
Bent
Max displacement
no momentum
max potential
|
Linear System
|
Symmetrical
No distortion
No harmonics
|
Nonlinear Symmetrical
|
Odd harmonics distortion
|
Nonlinear Asymmetrical
|
Odd and even harmonic distortion
|
Aperiodic Signal
|
Does not repeat, white noise, unpredictable
|
2 Equal sounds increase by
|
3dB
|
If you DOUBLE the PRESSURE
|
dB goes up by 6
|
When distance is DOUBLED
|
Energy level decreases by A FACTOR OF 4
|
RMS
|
Root mean square, avg of a wave
|
Reinforcement
|
Wave added to same wave, add 3dB
|
Interference
|
waves added are not exact, you get acoustic beats
|
Cancellation
|
Exactly 180degrees apart, cancel eachother, 0dB
|