1. The
decibel is a
unit of the measurement of _________.
A. amplitude
|
B. intensity
|
C. loudness
|
D. intensity
level
|
2. The difference between intensities of 1
watt/m2 and 10-4 w/m2,
a difference of 104 or 10,000, is
_________.
A. 4 dB
|
B. 10 dB
|
C. 40 dB
|
D. 100 dB
|
3. Two
sound sources of equal intensity when combined
under ideal conditions raise the overall sound level
by _______, whereas doubling the amplitude of
one source raises the level by _______.
First blank
|
A.
1 dB
|
B.
3 dB |
C.
6 dB
|
D.10
dB
|
Second blank
|
A.
1 dB
|
B.
3 dB
|
C.
6 dB |
D.
10 dB |
4. Normal
conversation is typically in the range of
_________, whereas trucks, subways and
motorcycles are typically in the range of
________.
First blank
|
A.
30 dB
|
B.
60 dB
|
C.
90-100
dB
|
D.
120-130 dB
|
Second blank
|
A.
30 dB
|
B.
60 dB
|
C.
90-100 dB
|
D.
120-130 dB |
5. The reference level of 0 dB denotes
the threshold of hearing and has the same meaning
as the reference level commonly found on a level
meter for audio signals. T or F.
6. When a particle experiences maximum
displacement from its average or rest position due to a
vibration, its velocity and the pressure exerted on the
surrounding medium are both __________.
A. zero
|
B. at a
maximum
|
C. at a
minimum or negative
|
D. 0.707 the
maximum value
|
7. A sound level meter reacts to and
therefore measures changes in ___________.
A. loudness
|
B. intensity
|
C. sound
pressure
|
D. power
|
8. SPL may be measured in dBA. T or F
9. The A weighting network on a sound level
meter discriminates against low frequency sounds in the
same way the ear does at both low and high sound
intensity levels. T
or F
10. A change of hearing sensitivity due to
noise exposure is called _______.
A. attenuation
|
B.
masking
|
C.
damping
|
D. TTS
|
11. The ear is most sensitive in the frequency range of
________.
A. 20
Hz - 2 kHz
|
B. 100
Hz - 1000 Hz
|
C. 1
kHz - 4 kHz
|
D. 10
kHz - 100 kHz
|
12. Reduction
of the dynamic range of an audio signal is called
__________.
A.
attenuation
|
B.
compression
|
C.
threshold shift
|
D.
enveloping
|
13. The
envelope of a sound is its variation of amplitude in
time. T or
F
14. The
part of the envelope containing information which
is the most important for the identification of
how the sound source was set in motion is its
attack transients. T or F
15. The
curves of equal loudness connect points whose
loudness is equal; all such points have the same
value in units of __________.
A.
Leq
|
B.
dB
|
C.
LA
|
D.
phons
|
16. Which
is a unit of loudness?
A.
L10
|
B.
dB
|
C.
SPL
|
D.
sones
|
17. Which
term does not correspond to the temporal
dimension of music?
A.
dynamics
|
B.
tempo
|
C.
beat
|
D.
metre
|
For the following questions, use the Handbook
links to solve the problem:
18. Using the chart in Inverse
Square Law, calculate the corrected level
for the distances shown below for a measured level
of 70 dB at 20 feet.
19. Using the chart for Sound
Pressure Level, calculate the following
summations:
A.
60 dB + 62 dB = _______.
|
B.
55 dB + 60 dB = ________.
|
C.
50 dB + 57 dB + 60 dB = _________.
|
20. Using the chart for Phons,
determine the SPL of a 60 Hz tone which has
the same loudness as a 1kHz tone which has a
loudness of 40 phons: A.
________. What would be equivalent SPL
for a 4 kHz tone? B.
______.
