SHS 311 Final Exam Questions with 100%
Correct Answers
Objective psychophysics
there is definitely "correct" or "incorrect" answer
During the calibration of the MAP procedure, 0.5 volts of input to the headphone
produced 100 micropascals of sound pressure measure by the microphone inside the
manikin. During testing, 0.1 volts of input to the headphone produced a sound pressure
that was just detectable for the listener. What was the hearing threshold in micropascals
for the listener?
20 micropascals
what is the dynamic range of hearing?
from the softest sound level one can detect to the loudest sound level one can tolerate
If the power remains the same and the duration increases by a factor of 100, what
happens to the sound's energy
energy increases by 20 dB
If the Weber's Fraction for frequency discrimination is 0.1, and the base frequency is
900 Hz, what is the end in Hz for discriminating a difference in frequency from 900 Hz?
90 Hz
What is the approximate Weber's Fraction in dB for intensity discrimination?
1 dB
What is masking?
,the threshold for detecting a sound is increased due to the presence of another sound
If a 1400 Hz masker is masking a 2803 Hz signal, what perceptual phenomenon occur?
beatings between the signal and the second harmonic of the masker
the turning curve may indicate the shape of the internal auditory filter centered on?
signal frequency
If a 2 dB signal to noise ratio is required for tonal signal detection in the presence of a
broadband noise within a spectrum level of 50 dB, what is the required signal-to-noise-
ratio for tonal signal detection if the spectrum level of the broadband noise is increased
by 10 dB?
2 dB
what is a critical band?
a frequency band centered on the signal frequency, in which the masker can effectively mask
the signal
what is the difference between backward and forward masking?
signal is before masker in backward masking, while masker is before signal in forward
masking
What is the theory used to explain localization in the azimuth plane?
duplex theory of localization
Minimal audible angle is smallest at?
0 degree azimuth
in the precedence effect, what is taking precedence?
, the source sound takes precedence over reflected sound in determining source location
what does M(pie)So refer to?
signal is inter aurally in phase, masker is inter aurally 180 degrees out of phase
if a 68 dB SPL sound is judged equally loud to a 50 dB SPL, 1000 Hz tone, how loud is
the 68 dB SPL sound?
50 phons
what is a sone
a measure of loudness
if a sound consists of the following spectral componentsL 375 Hz, 500 Hz, 625 Hz, 750
Hz, and 875 Hz. What is likely to be the perceived pitch in Hz?
125 Hz
can temporal periodicity and spectral structure explain all of the experimental data on
pitch perception of complex sound?
no
psychophysics
the study of the relationship between the physical variables of environmental events/objects
and the sensation and perception that they elicit
objective psychophysics
-detection
-discrimination
-recognition
Correct Answers
Objective psychophysics
there is definitely "correct" or "incorrect" answer
During the calibration of the MAP procedure, 0.5 volts of input to the headphone
produced 100 micropascals of sound pressure measure by the microphone inside the
manikin. During testing, 0.1 volts of input to the headphone produced a sound pressure
that was just detectable for the listener. What was the hearing threshold in micropascals
for the listener?
20 micropascals
what is the dynamic range of hearing?
from the softest sound level one can detect to the loudest sound level one can tolerate
If the power remains the same and the duration increases by a factor of 100, what
happens to the sound's energy
energy increases by 20 dB
If the Weber's Fraction for frequency discrimination is 0.1, and the base frequency is
900 Hz, what is the end in Hz for discriminating a difference in frequency from 900 Hz?
90 Hz
What is the approximate Weber's Fraction in dB for intensity discrimination?
1 dB
What is masking?
,the threshold for detecting a sound is increased due to the presence of another sound
If a 1400 Hz masker is masking a 2803 Hz signal, what perceptual phenomenon occur?
beatings between the signal and the second harmonic of the masker
the turning curve may indicate the shape of the internal auditory filter centered on?
signal frequency
If a 2 dB signal to noise ratio is required for tonal signal detection in the presence of a
broadband noise within a spectrum level of 50 dB, what is the required signal-to-noise-
ratio for tonal signal detection if the spectrum level of the broadband noise is increased
by 10 dB?
2 dB
what is a critical band?
a frequency band centered on the signal frequency, in which the masker can effectively mask
the signal
what is the difference between backward and forward masking?
signal is before masker in backward masking, while masker is before signal in forward
masking
What is the theory used to explain localization in the azimuth plane?
duplex theory of localization
Minimal audible angle is smallest at?
0 degree azimuth
in the precedence effect, what is taking precedence?
, the source sound takes precedence over reflected sound in determining source location
what does M(pie)So refer to?
signal is inter aurally in phase, masker is inter aurally 180 degrees out of phase
if a 68 dB SPL sound is judged equally loud to a 50 dB SPL, 1000 Hz tone, how loud is
the 68 dB SPL sound?
50 phons
what is a sone
a measure of loudness
if a sound consists of the following spectral componentsL 375 Hz, 500 Hz, 625 Hz, 750
Hz, and 875 Hz. What is likely to be the perceived pitch in Hz?
125 Hz
can temporal periodicity and spectral structure explain all of the experimental data on
pitch perception of complex sound?
no
psychophysics
the study of the relationship between the physical variables of environmental events/objects
and the sensation and perception that they elicit
objective psychophysics
-detection
-discrimination
-recognition
