CSD 303 Exam 1 Study Guide
Questions Correctly Answered
pressure - CORRECT ANSWER sound travels as _______ fluctuations
elastic, compression, rarefaction - CORRECT ANSWER acoustic medium is _____, which allows particles
to crowd together and move apart:
_________ = region in a longitudinal wave where the particles are closest together
__________ = region in a longitudinal wave where particles are further apart than they would be at
atmospheric pressure
no, sine, constant - CORRECT ANSWER are all waves periodic?
_______ waves = another name for simple periodic waves = periodic oscillations of _______ amplitude
frequency, amplitude, phase, period - CORRECT ANSWER 3 properties needed to define a sine wave:
1) _____________ = how many cycles a wave completes per unit time (how fast)
2) ____________ = peak deviation of a pressure fluctuation from normal atmospheric pressure (how big)
3) _______ = timing of the waveform relative to some reference point (when/with what delay?)
*note: the __________ = the duration of one cycle or the time it takes for a wave to complete one cycle
greatest common denominator - CORRECT ANSWER how do you find the fundamental frequency of a
complex periodic wave (one composed of at least 2 sine waves)?
Find the ____________
, 100 Hz - CORRECT ANSWER If a complex wave has 400 Hz and 500 Hz components, what's the
fundamental frequency?
frequency, amplitude - CORRECT ANSWER a power spectrum plots ___________ on the x-axis and
____________ on the y-axis
Fourier, frequency - CORRECT ANSWER ____________'s theorem = says any complex wave can be
decomposed into a set of sine waves having particular frequencies, amplitudes, and phase relations
(_______ analysis of a complex wave yields a power spectrum of its components)
*replaces time on the x-axis with ________ to display components)
flat, equal - CORRECT ANSWER what does the power spectrum look like for white noise?
a relatively ______ spectrum, because white noise has nearly ______ amplitude for all possible
frequency components
aperiodic, white noise, transient, impulse - CORRECT ANSWER ________ waves = those with random
waveform or a non-repeating pattern
example: /f/ or /θ/ sound (fricatives = made by turbulent airflows)
examples:
1) _______________ = sound characterized by random pressure fluctuations
2) ____________ = bursts which produce sudden pressure fluctuations that aren't sustained or repeated
over time (ex: door slam, balloon pop, etc.)
a.k.a a(n) ________________ = energy only at one point in time
sudden peak in amplitude at one point in time, perfectly straight horizontal line at a single amplitude -
CORRECT ANSWER What does the waveform of a transient signal (impulse) look like?
Questions Correctly Answered
pressure - CORRECT ANSWER sound travels as _______ fluctuations
elastic, compression, rarefaction - CORRECT ANSWER acoustic medium is _____, which allows particles
to crowd together and move apart:
_________ = region in a longitudinal wave where the particles are closest together
__________ = region in a longitudinal wave where particles are further apart than they would be at
atmospheric pressure
no, sine, constant - CORRECT ANSWER are all waves periodic?
_______ waves = another name for simple periodic waves = periodic oscillations of _______ amplitude
frequency, amplitude, phase, period - CORRECT ANSWER 3 properties needed to define a sine wave:
1) _____________ = how many cycles a wave completes per unit time (how fast)
2) ____________ = peak deviation of a pressure fluctuation from normal atmospheric pressure (how big)
3) _______ = timing of the waveform relative to some reference point (when/with what delay?)
*note: the __________ = the duration of one cycle or the time it takes for a wave to complete one cycle
greatest common denominator - CORRECT ANSWER how do you find the fundamental frequency of a
complex periodic wave (one composed of at least 2 sine waves)?
Find the ____________
, 100 Hz - CORRECT ANSWER If a complex wave has 400 Hz and 500 Hz components, what's the
fundamental frequency?
frequency, amplitude - CORRECT ANSWER a power spectrum plots ___________ on the x-axis and
____________ on the y-axis
Fourier, frequency - CORRECT ANSWER ____________'s theorem = says any complex wave can be
decomposed into a set of sine waves having particular frequencies, amplitudes, and phase relations
(_______ analysis of a complex wave yields a power spectrum of its components)
*replaces time on the x-axis with ________ to display components)
flat, equal - CORRECT ANSWER what does the power spectrum look like for white noise?
a relatively ______ spectrum, because white noise has nearly ______ amplitude for all possible
frequency components
aperiodic, white noise, transient, impulse - CORRECT ANSWER ________ waves = those with random
waveform or a non-repeating pattern
example: /f/ or /θ/ sound (fricatives = made by turbulent airflows)
examples:
1) _______________ = sound characterized by random pressure fluctuations
2) ____________ = bursts which produce sudden pressure fluctuations that aren't sustained or repeated
over time (ex: door slam, balloon pop, etc.)
a.k.a a(n) ________________ = energy only at one point in time
sudden peak in amplitude at one point in time, perfectly straight horizontal line at a single amplitude -
CORRECT ANSWER What does the waveform of a transient signal (impulse) look like?
