COMD 5070 final prep UPDATED ACTUAL
Exam Questions and CORRECT Answers
As sound travels through air, it does so as a - CORRECT ANSWER - longitudinal
pressure wave
The period of a sine wave - CORRECT ANSWER - is shorter for higher frequency sounds
Pressure can de defined as - CORRECT ANSWER - force divided by area
Intensity can be defined as - CORRECT ANSWER - power per unit area
The inverse square law means that - CORRECT ANSWER - intensity decreases by a
factor equal to the square of the change in distance
Based on the equal loudness curves figure (2-18, p33), a 100 Hz tone would need to be
approximately how many dB in intensity to sound equally loud to a 1000 Hz tone at 40 dB? -
CORRECT ANSWER - 53 dB
We can typically perceive smaller differences in the pitch of two sounds if they are - CORRECT
ANSWER - two lower frequencies
The human voice as a complex tone is best described as - CORRECT ANSWER - nearly
periodic
A power spectrum is a type of - CORRECT ANSWER - frequency domain plot
Resonance occurs when - CORRECT ANSWER - the applied force is at a frequency that
matches the natural frequency of an object
, which of the following is an analog signal? - CORRECT ANSWER - speech sounds in air
musical tones in air
displacement of the middle ear bones
all of the above
an analog signal (e.g. from a microphone) - CORRECT ANSWER - is continuous in
amplitude
is continuous in time
both of the above
a table of numbers could fully represent - CORRECT ANSWER - a digital signal
you cannot listen to digital sound via digital headphones - CORRECT ANSWER - because
the sound is really generated by analog loudspeakers
quantization refers to - CORRECT ANSWER - the assignment of an analog value to the
nearest digital value available
an 8-bit A/D system has how many quantization levels? - CORRECT ANSWER - 256
The sampling theorem indicates - CORRECT ANSWER - the minimum sample rate
needed to perfectly reconstruct a signal
aliasing during digital recording means that - CORRECT ANSWER - a sinusoid is
transformed into a different frequency
Exam Questions and CORRECT Answers
As sound travels through air, it does so as a - CORRECT ANSWER - longitudinal
pressure wave
The period of a sine wave - CORRECT ANSWER - is shorter for higher frequency sounds
Pressure can de defined as - CORRECT ANSWER - force divided by area
Intensity can be defined as - CORRECT ANSWER - power per unit area
The inverse square law means that - CORRECT ANSWER - intensity decreases by a
factor equal to the square of the change in distance
Based on the equal loudness curves figure (2-18, p33), a 100 Hz tone would need to be
approximately how many dB in intensity to sound equally loud to a 1000 Hz tone at 40 dB? -
CORRECT ANSWER - 53 dB
We can typically perceive smaller differences in the pitch of two sounds if they are - CORRECT
ANSWER - two lower frequencies
The human voice as a complex tone is best described as - CORRECT ANSWER - nearly
periodic
A power spectrum is a type of - CORRECT ANSWER - frequency domain plot
Resonance occurs when - CORRECT ANSWER - the applied force is at a frequency that
matches the natural frequency of an object
, which of the following is an analog signal? - CORRECT ANSWER - speech sounds in air
musical tones in air
displacement of the middle ear bones
all of the above
an analog signal (e.g. from a microphone) - CORRECT ANSWER - is continuous in
amplitude
is continuous in time
both of the above
a table of numbers could fully represent - CORRECT ANSWER - a digital signal
you cannot listen to digital sound via digital headphones - CORRECT ANSWER - because
the sound is really generated by analog loudspeakers
quantization refers to - CORRECT ANSWER - the assignment of an analog value to the
nearest digital value available
an 8-bit A/D system has how many quantization levels? - CORRECT ANSWER - 256
The sampling theorem indicates - CORRECT ANSWER - the minimum sample rate
needed to perfectly reconstruct a signal
aliasing during digital recording means that - CORRECT ANSWER - a sinusoid is
transformed into a different frequency
