ASLP 3030 Exam 2 Study UPDATED
ACTUAL Exam Questions and CORRECT
Answers
What is decibel scale? - CORRECT ANSWER - a logarithmic scale
Why do we use a logarithmic scale for a decibel scale?
when intensity ratio doubles, dBs increase by 3 dB; intensity ratio increase by 10, dB increase by
10 - CORRECT ANSWER - expressing sound intensity or sound pressure
The db scale - CORRECT ANSWER - dB = Px/Pr
db IL scale - CORRECT ANSWER - denotes a standardized reference (10^-12
watts/m^2).
Reference intensity is always standardized reference. 0dB is the reference intensity.
db SPL scale - CORRECT ANSWER - intensity = Pressure^2
when pressure ratio doubles, dB increase by 6 dB...reciprocal is true as well. pressure ratio
increases by a power of 10, dB increase by 20...reciprocal is true as well
db HL scale - CORRECT ANSWER - audiogram
Formula to calculate db IL - CORRECT ANSWER - dB = 10Log 10 1x/1r; 4:1 >
10Log 10 (4/1) = 6 dB
Formula to calculate db SPL - CORRECT ANSWER - dB SPL = 20Log 10 Px/Pr; 2:1 >
20Log 10 (2/1) =6 dB
, Inverse Square Law - decibels - CORRECT ANSWER - used to show how sound
propagates
SPLnew = SPLref + (20 × Log rRef/rNew)
each time the distance from a sound source is doubled, SPL increases by 6 dB.
Scientific notation - CORRECT ANSWER -
Metric prefixes - CORRECT ANSWER -
How do low pass vs. high pass filters differ? - CORRECT ANSWER - low-pass filters
pass all frequencies below a particuilar value and high-pass pass all frequencies above a
particular value. All other frequencies haves their amplitudes attenuated
A low pass filter gets rid of/filters out HIGH frequencies. Everything below a cutoff frequency is
PASSED, everything above is ATTENUATED. Conversely, a high pass filter passes all
frequencies above a particular value/ Frequencies below/LOWER than that value will have their
amplitudes attenuated
Describe a band pass filter - CORRECT ANSWER - passes all sinusoids with frequencies
within a certain range. Typically, two cutoff frequencies.
A bandpass filter has 2 cutoff frequencies. Frequencies that do not fall in this range are
attenuated/not passed through
How does the vocal tract act as a filter? - CORRECT ANSWER - Acts as an acoustic
filter.
as a talker produces sound, the vocal folds in a larynx vibrate. The vibrating vocal folds produce
a complex wave with a wide range of harmonics. the configuration of the vocal tract results in a
particular filter function. the sound that emerges results from the input sound from the larynx
being filtered through the upper vocal tract.
ACTUAL Exam Questions and CORRECT
Answers
What is decibel scale? - CORRECT ANSWER - a logarithmic scale
Why do we use a logarithmic scale for a decibel scale?
when intensity ratio doubles, dBs increase by 3 dB; intensity ratio increase by 10, dB increase by
10 - CORRECT ANSWER - expressing sound intensity or sound pressure
The db scale - CORRECT ANSWER - dB = Px/Pr
db IL scale - CORRECT ANSWER - denotes a standardized reference (10^-12
watts/m^2).
Reference intensity is always standardized reference. 0dB is the reference intensity.
db SPL scale - CORRECT ANSWER - intensity = Pressure^2
when pressure ratio doubles, dB increase by 6 dB...reciprocal is true as well. pressure ratio
increases by a power of 10, dB increase by 20...reciprocal is true as well
db HL scale - CORRECT ANSWER - audiogram
Formula to calculate db IL - CORRECT ANSWER - dB = 10Log 10 1x/1r; 4:1 >
10Log 10 (4/1) = 6 dB
Formula to calculate db SPL - CORRECT ANSWER - dB SPL = 20Log 10 Px/Pr; 2:1 >
20Log 10 (2/1) =6 dB
, Inverse Square Law - decibels - CORRECT ANSWER - used to show how sound
propagates
SPLnew = SPLref + (20 × Log rRef/rNew)
each time the distance from a sound source is doubled, SPL increases by 6 dB.
Scientific notation - CORRECT ANSWER -
Metric prefixes - CORRECT ANSWER -
How do low pass vs. high pass filters differ? - CORRECT ANSWER - low-pass filters
pass all frequencies below a particuilar value and high-pass pass all frequencies above a
particular value. All other frequencies haves their amplitudes attenuated
A low pass filter gets rid of/filters out HIGH frequencies. Everything below a cutoff frequency is
PASSED, everything above is ATTENUATED. Conversely, a high pass filter passes all
frequencies above a particular value/ Frequencies below/LOWER than that value will have their
amplitudes attenuated
Describe a band pass filter - CORRECT ANSWER - passes all sinusoids with frequencies
within a certain range. Typically, two cutoff frequencies.
A bandpass filter has 2 cutoff frequencies. Frequencies that do not fall in this range are
attenuated/not passed through
How does the vocal tract act as a filter? - CORRECT ANSWER - Acts as an acoustic
filter.
as a talker produces sound, the vocal folds in a larynx vibrate. The vibrating vocal folds produce
a complex wave with a wide range of harmonics. the configuration of the vocal tract results in a
particular filter function. the sound that emerges results from the input sound from the larynx
being filtered through the upper vocal tract.
