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COMD 5070 Final Exam With 100% Verified Solutions!!
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COMD 5070 Final Exam With 100% Verified Solutions!!
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COMD 5070 Final Exam With 100%Verified Solutions!!
4 features of the scientific method CORRECT ANSWERS Empirical: based on data
Deterministic: Obeys physical laws, things are not random
Predictive
Parsimonious: Use simplest explanation but no simpler
How many semitones in an octave? CORRECT ANSWERS 12
What is the Nyquist frequency? CORRECT ANSWERS Half the sample rate
The highest frequency the recording is able to reproduce
High pass filter CORRECT ANSWERS Allows high frequencies through
Low pass filter CORRECT ANSWERS Allows low frequencies through
Band pass filter CORRECT ANSWERS Allows a band of frequencies through - holds
back higher and lower frequencies
Band reject filter CORRECT ANSWERS Holds back a band of frequencies - allows high
and low frequencies through
What is the Fourier theorem? CORRECT ANSWERS All periodic sounds are made of a
combination of sine waves. Amplitudes, phase angles and frequencies all vary
What does a Fourier transform create? CORRECT ANSWERS A spectrum from the
time domain waveform
What is the x-axis on a time-domain waveform? CORRECT ANSWERS Time
What is the y-axis on a time-domain waveform? CORRECT ANSWERS Amplitude
What is the x-axis on a frequency-domain line spectrum? CORRECT ANSWERS
Frequency
What is the y-axis on a frequency-domain line spectrum? CORRECT ANSWERS
Amplitude
What is the x-axis on a 3D spectrogram? CORRECT ANSWERS Time
What is the y-axis on a 3D spectrogram? CORRECT ANSWERS Frequency
What does darkness represent on a 3D spectrogram? CORRECT ANSWERS Intensity
, What is a Fast Fourier Transform (FFT)? CORRECT ANSWERS Revealing of source.
Shows harmonic energy and range of harmonics in the sound.
What is Linear Predictive Coding (LPC) CORRECT ANSWERS Revealing of filter.
Shows spectral envelope and where the resonant frequencies are.
What does a line spectrum show? CORRECT ANSWERS A snapshot in time
What does a spectrogram show? CORRECT ANSWERS Speech over time
What is perturbation? CORRECT ANSWERS Rapid and random, i.e. hoarseness
What is modulation? CORRECT ANSWERS Rhythmic change in F0 and amplitude, i.e.
vocal tremor
Tracheal puncture CORRECT ANSWERS Direct, accurate measure of subglottal
pressure during speech
Medical procedure
Esophageal pressure CORRECT ANSWERS Direct measure of subglottal pressure
Person swallows esophageal balloon
Not a very practical or common procedure
Estimating subglottal pressure CORRECT ANSWERS Time when the pressure in the
mouth is the same as below the larynx
Finding intraoral pressure during a particular time - say a series of 'papapapa' and make
your measurements from that
How do you calculate average air flow? CORRECT ANSWERS if 1 liter of air is used...
and phonation lasts for 5 seconds...
average flow = 1/5 liter per second
or 200 cc/second or 0.2 liters/second
flow at a given instant may be different
Ohm's law CORRECT ANSWERS E=IR
Voice, flow and pressure are all linearly related to one another
Estimating laryngeal resistance CORRECT ANSWERS Psub (cmH2O) divided by flow
(L/s)
semitone standard deviation [how do the numbers reflect our perception of intonation in
speech?] CORRECT ANSWERS Comparing SD in Hz would be fine if the mean were
the same for all speakers
Converting to semitones allows easy comparison across speakers - semitones are
scaled appropriately so that they reflect proportional changes
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