Aud Science Review Flashcards
azmith
Horizontal : 0 degrees in front of the head, 90 degrees is by the right ear, 180 degrees is behind the head, 270 degrees is by the left ear
Vertical : 0 degrees in front, 90 degrees on top, 180 behind
what are the big 3?
amplitude, frequency, and time
what are the perceptual qualities of the big 3
amplitude - loudness
frequency - pitch
time - duration
what bandwidth is a good generator?
narrow band
what bandwidth is good transducer ?
broad band
what is threshold microstructure?
the little changes on an audio gram between test points, we assume it falls where the line is
3 factors of masking
intensity of masker, frequency of masker, and temporal characteristics
what makes psychoacoustic procedures adaptive?
psychoacoustic procedures are adaptive, because you adjust how you test based off of the patient’s response
with regards to signal detection theory, someone with liberal criterion will present with thresholds that are relatively better or poorer?
Relatively better threshold
for listeners with typical hearing, Dublin of loudness is approximately equivalent, to an increase of how many dB
10
jnd intensity
1 dB or better
jnd frequency
approximately 0.5% of the frequency
jnd for duration
as short as 2-3 msec
why would the jnd for frequency be different at 2000 Hz than it is it 1000 Hz
List four factors that can affect threshold estimation
attention level, understanding of the directions, motivation, level, and internal criterion
True or false loudest perception is dependent upon the frequency of the stimulus
true
what are the five parameters for measuring threshold behaviorally?
Method of presentation, starting level, stepsize, stopping role, and how the threshold is defined
What is differential sensitivity?
test assesses the smallest detectable difference between two stimuli that vary in sound pressure
what is absolute sensitivity?
Test assesses the least amount of sound pressure level at which a subject response 50% of the time
The cochlea is nonlinear, meaning that the amount of game differs based on input level. is more gain applied at low-level inputs, mid-level, and puts or high-level inputs?
 Low input level
dynamic range refers to
The range between the least audible sound in the highest tolerable sound
What is the frequency range with the auditory system is the most sensitive?
1000 to 5000 Hz
if you increase the stiffness …
The rate of vibration will increase
if you increase the mass…
The rate of a ration will decrease
basic quantities
Time, length, and mass
derived quantities
require more than one factor. examples are velocity, displacement, and power
what’s the difference between scalar and vector quanties
they both have magnitude but only vector has direction
sound pressure
Force per unit area measured at one particular location away from the source
sound power
work per time unit, property of the sound source
sound intensity
Power per unit area, described as the flow of sound
RMS
average amplitude
doubling of intensity
+3 db
doubling of sound pressure
+ 6 dB
doubling of loudness
+10 dB
