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COMD 5070 Exam | Study Questions with complete Solution| Verified Answers
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COMD 5070 Exam | Study Questions withcomplete Solution| Verified Answers
The loudness of a sound can be related to:
a.primarily the fundamental frequency
b. primarily the sampling rate
c. How many harmonics there are. Pure tones are always the quietest.
d. the amount of change in air pressure produced, but also the frequency of the sound and its
duration - ANSWER d. the amount of change in air pressure produced, but also the frequency of
the sound and its duration
which of the following is an analog signal?
a. all answers are analog
b. voltage through the microphone
c. mercury in a thermometer
d. cassette tapes - ANSWER a. all answers are analog
an analog signal ...
a. is not continuous in time
b. consists of snapshots
c. none of these answers are true
d. is continuous in time - ANSWER d. is continuous in time
a table of numbers could fully represent
,a. neither analog or digital signals
b. both analog and digital signals
c. a digital signal
d. an analog signal - ANSWER c. a digital signal
digital to analog conversion is necessary because...
a. they allow you to sample at a very high frequency
b. because your brain converts from binary to base10 signals
c. headphones/loudspeakers need to play analog sound waves for us to perceive the sound
d. computers can only store analog data - ANSWER c. headphones/loudspeakers need to
play analog sound waves for us to perceive the sound
quantization refers to
a. calculating the disk space needed to store a signal
b. the assignment of a digital value to describe the amplitude of a
waveform c. estimating the total quantity of sound to record
d. the rate at which numbers are recorded to sample a signal - ANSWER b. the assignment of a
digital value to describe the amplitude of a waveform
A 32-bit system has how many quantization levels?
a. approximately 1000
b. 8
c. over four billion
d. 64 - ANSWER c. over four billion
It is important to use the available amplitude/dynamic range when recording your
voice because...
a. increasing sample rate always increases signal quality
, b. the sound will remain analog if dynamic range is low
c. you cannot effectively "boost" the volume after it is digitized (details will be missing)
d. only theoretical sounds can be correctly sampled - ANSWER c. you cannot effectively "boost"
the volume after it is digitized (details will be missing)
aliasing during digital recording means that
a. each sample represents several sine components
b. a high frequency wave will be recorded at a different frequency
c. sine waves become triangle waves
d. none of the above - ANSWER b. a high frequency wave will be recorded at a
different frequency
The Nyquist frequency is...
a. is half the sample rate, the highest frequency you can accurately reproduce in your recording
b. all answers are correct
c. is the resolution of sound
d. removes white noise and electrical hum from recordings - ANSWER a. is half the sample rate,
the highest frequency you can accurately reproduce in your recording
If I want to record a speech sample and include frequencies up to 20,000 Hz in my
recording, what sample rate should I use?
a. any of the these sample rates will be adequate
b. at least 20, 000 Hz
c. at least 10,000 Hz
d. at least 40, 000 Hz - ANSWER d. at least 40, 000 Hz
Which of the following is true?
a. Voice quality always stays the same throughout our lives
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