COMD 5070 - Final Exam Questions and
Answers 100% Verified
what is science? what are the 4 features of the scientific method? - ANSWER--empirical
-deterministic
-predictive
-parsimonious
what does it mean for science to be empirical? - ANSWER-based on data
what does it mean for science to be deterministic? - ANSWER-obeys physical laws
what does it mean for science to be predictive? - ANSWER-if you do this.... then that
will happen
what does it mean for science to be parsimonious? - ANSWER-uses the simplest
explanation possible
how many semitones are in one octave? - ANSWER-12 semitones
how much sampling is enough? - ANSWER-sample at 2x the rate of the highest
frequency (e.g. data up to 5 kHz = sample at 10 kHz, data up to 100 Hz = sample at 200
Hz)
what is the Nyquist frequency? - ANSWER-half the sample rate
if you want to go up one octave, you ______ the frequency. - ANSWER-double
if you want to go down one octave, you ______ the frequency. - ANSWER-halve
what does a high pass filter do? - ANSWER-allows high frequencies through
what does a low pass filter do? - ANSWER-allows low frequencies through
what does a band pass filter do? - ANSWER-allows a band of frequencies through (mid)
what does a band reject filter do? - ANSWER-holds back/attenuates a band of
frequencies (allows high and low frequencies)
what does a Fourier transform do? - ANSWER-creates a spectrum from the time
domain waveform (deconstructs the waveform)
, what is the cake analogy to a Fourier transform? - ANSWER-analyze a cake to learn its
ingredients
what does a time domain display show? - ANSWER--a waveform represents sound
directly
-air pressure changes over time
what does a frequency domain display show? - ANSWER-a line spectrum shows the
frequency components of a periodic sound
what is a FFT spectrum? - ANSWER-fast Fourier transform
-shows harmonic energy
-each peak is a harmonic
-less clear at showing formants
what is FFT reveal more of? - ANSWER-vocal SOURCE
what is a LPC spectrum? - ANSWER-linear predictive coding
-shows spectral envelope (doesn't show individual harmonics)
-good at revealing formants
what does a LPC spectrum reveal more of? - ANSWER-vocal tract FILTER
on a spectrum, a sine wave appears as ___________. - ANSWER-a single line
a line spectrum is a _______ in time. - ANSWER-snapshot
what is the x-axis in a speech spectrogram? - ANSWER-X = TIME
what is the y-axis in a speech spectrogram? - ANSWER-Y = FREQUENCY
what does the darkness in a speech spectrogram represent? - ANSWER-darkness =
INTENSITY
what is the difference between perturbation and modulation? - ANSWER-modulation is
much slower than random cycle-to-cycle perturbation; modulation is spread across
many cycles
what is jitter? - ANSWER-frequency perturbation
what is shimmer? - ANSWER-amplitude perturbation
what is tremor? - ANSWER-rhythmic change in fundamental frequency and amplitude
hoarse voices have (high/low) perturbation. - ANSWER-higher
Answers 100% Verified
what is science? what are the 4 features of the scientific method? - ANSWER--empirical
-deterministic
-predictive
-parsimonious
what does it mean for science to be empirical? - ANSWER-based on data
what does it mean for science to be deterministic? - ANSWER-obeys physical laws
what does it mean for science to be predictive? - ANSWER-if you do this.... then that
will happen
what does it mean for science to be parsimonious? - ANSWER-uses the simplest
explanation possible
how many semitones are in one octave? - ANSWER-12 semitones
how much sampling is enough? - ANSWER-sample at 2x the rate of the highest
frequency (e.g. data up to 5 kHz = sample at 10 kHz, data up to 100 Hz = sample at 200
Hz)
what is the Nyquist frequency? - ANSWER-half the sample rate
if you want to go up one octave, you ______ the frequency. - ANSWER-double
if you want to go down one octave, you ______ the frequency. - ANSWER-halve
what does a high pass filter do? - ANSWER-allows high frequencies through
what does a low pass filter do? - ANSWER-allows low frequencies through
what does a band pass filter do? - ANSWER-allows a band of frequencies through (mid)
what does a band reject filter do? - ANSWER-holds back/attenuates a band of
frequencies (allows high and low frequencies)
what does a Fourier transform do? - ANSWER-creates a spectrum from the time
domain waveform (deconstructs the waveform)
, what is the cake analogy to a Fourier transform? - ANSWER-analyze a cake to learn its
ingredients
what does a time domain display show? - ANSWER--a waveform represents sound
directly
-air pressure changes over time
what does a frequency domain display show? - ANSWER-a line spectrum shows the
frequency components of a periodic sound
what is a FFT spectrum? - ANSWER-fast Fourier transform
-shows harmonic energy
-each peak is a harmonic
-less clear at showing formants
what is FFT reveal more of? - ANSWER-vocal SOURCE
what is a LPC spectrum? - ANSWER-linear predictive coding
-shows spectral envelope (doesn't show individual harmonics)
-good at revealing formants
what does a LPC spectrum reveal more of? - ANSWER-vocal tract FILTER
on a spectrum, a sine wave appears as ___________. - ANSWER-a single line
a line spectrum is a _______ in time. - ANSWER-snapshot
what is the x-axis in a speech spectrogram? - ANSWER-X = TIME
what is the y-axis in a speech spectrogram? - ANSWER-Y = FREQUENCY
what does the darkness in a speech spectrogram represent? - ANSWER-darkness =
INTENSITY
what is the difference between perturbation and modulation? - ANSWER-modulation is
much slower than random cycle-to-cycle perturbation; modulation is spread across
many cycles
what is jitter? - ANSWER-frequency perturbation
what is shimmer? - ANSWER-amplitude perturbation
what is tremor? - ANSWER-rhythmic change in fundamental frequency and amplitude
hoarse voices have (high/low) perturbation. - ANSWER-higher
