Hesp407 Final Questions With Complete Solutions
___________ can be added linearly, but pressure and level can't
be. Correct Answers intensities
____&_____ are universal among people, but ___________ is
individualized Correct Answers ITDs & ILDs, pinna
2 major problems with CIs Correct Answers --pitch is poorly
represented (poor voice recognition and music appreciation)
--Localization and speech in noise is poor
7 grouping cues Correct Answers 1. Spectral Separation
2. Spectral profile
3. Harmonicity/Temporal Regularity
4. Spatial Separation
5.Temporal Separation
6. Temporal onsets and offsets
7.Temporal modulations
a broader critical band is cause by damage to.... Correct Answers
OHC
a shorter sound needs ______ power, while a longer sound
needs _________ power in order for them to be equal Correct
Answers more, less
a tone will mask _______ frequency targets more than
__________. this is called ____________________ Correct
Answers higher, lower, upward spread of masking
,aural harmonics and combo tone interactions Correct Answers -
Due to non‐ linearity of
auditory system
- Occurs at high
levels
- Not audible at low
levels
band reject filter Correct Answers
band widening experiment Correct Answers increase noise band
= more noise/masking until a certain point
bandpass filter Correct Answers
beats Correct Answers - When f1 and f2
close
- Strongest at 3‐5 Hz
beating and equal
amplitudes
- Fixed by using
shorter durations.
CI analysis stage (#1) Correct Answers --use bandpass filters
--Break info up into different frequency bands (low frequency
info, mid frequency info, high frequency info, etc.)
CI Carrier Stage (#3) Correct Answers Use electrical pulse
trains for ci's (narrowband noises and sine tones for vocoders)
, CI envelope extraction stage (#2) Correct Answers --Extract
ENVELOPE (fine structure of signal is ignored)
--Use temporal envelope for modification
--You can understand speech well only with envelope info
CIs encode sounds through Correct Answers the envelope from
band-pass filtered signals
CIs work so well because... Correct Answers speech is a
redundant signal
condensation vs rarefaction Correct Answers condensation:
molecules are condensed (crests)
Rarefaction: density of air molecules is thin (valleys)
critical band Correct Answers Only energy within a critical
band of frequencies surrounding the signal are
effective in masking the signal.
critical band size Correct Answers critical bandwidth increases
with frequency
Shape of filter does not change much with
frequency
Width of critical band does increase with level
___________ can be added linearly, but pressure and level can't
be. Correct Answers intensities
____&_____ are universal among people, but ___________ is
individualized Correct Answers ITDs & ILDs, pinna
2 major problems with CIs Correct Answers --pitch is poorly
represented (poor voice recognition and music appreciation)
--Localization and speech in noise is poor
7 grouping cues Correct Answers 1. Spectral Separation
2. Spectral profile
3. Harmonicity/Temporal Regularity
4. Spatial Separation
5.Temporal Separation
6. Temporal onsets and offsets
7.Temporal modulations
a broader critical band is cause by damage to.... Correct Answers
OHC
a shorter sound needs ______ power, while a longer sound
needs _________ power in order for them to be equal Correct
Answers more, less
a tone will mask _______ frequency targets more than
__________. this is called ____________________ Correct
Answers higher, lower, upward spread of masking
,aural harmonics and combo tone interactions Correct Answers -
Due to non‐ linearity of
auditory system
- Occurs at high
levels
- Not audible at low
levels
band reject filter Correct Answers
band widening experiment Correct Answers increase noise band
= more noise/masking until a certain point
bandpass filter Correct Answers
beats Correct Answers - When f1 and f2
close
- Strongest at 3‐5 Hz
beating and equal
amplitudes
- Fixed by using
shorter durations.
CI analysis stage (#1) Correct Answers --use bandpass filters
--Break info up into different frequency bands (low frequency
info, mid frequency info, high frequency info, etc.)
CI Carrier Stage (#3) Correct Answers Use electrical pulse
trains for ci's (narrowband noises and sine tones for vocoders)
, CI envelope extraction stage (#2) Correct Answers --Extract
ENVELOPE (fine structure of signal is ignored)
--Use temporal envelope for modification
--You can understand speech well only with envelope info
CIs encode sounds through Correct Answers the envelope from
band-pass filtered signals
CIs work so well because... Correct Answers speech is a
redundant signal
condensation vs rarefaction Correct Answers condensation:
molecules are condensed (crests)
Rarefaction: density of air molecules is thin (valleys)
critical band Correct Answers Only energy within a critical
band of frequencies surrounding the signal are
effective in masking the signal.
critical band size Correct Answers critical bandwidth increases
with frequency
Shape of filter does not change much with
frequency
Width of critical band does increase with level
