COMD 5070 Exam 3 (New 2024/2025
Update) Acoustics of Speech and Hearing|
Questions and Verified Answers| 100%
Correct| Graded A
QUESTION
On a 3D spectrogram, how high does the frequency go relative to the sample rate?
Answer:
- Nyquist frequency (which is twice the frequency of the highest frequency component).
QUESTION
If interested at looking at high frequency speech components on a spec- trogram, you should do
what?
Answer:
At least double the sample rate, and give it a little more safety margin above that.
QUESTION
What is a high pass filter?
Answer:
High frequencies pass through, low frequencies are held back.
QUESTION
What is a low pass filter?
Answer:
Low frequencies pass through and high frequencies are held back.
COMD 5070 Exam 3 (New 2024/2025 1
Update) Acoustics of Speech and Hearing
, QUESTION
What is a band pass filter?
Answer:
Allows a band of frequencies to pass through, holds back both higher and lower frequencies.
QUESTION
What is a band reject filter?
Answer:
Allows higher and lower frequencies to pass through, holds back a band of frequencies.
QUESTION
Who created the Fourier transform?
Answer:
Joseph Fourier.
QUESTION
What is the Fourier transform?
Answer:
A way to analyze and split complex sounds.
QUESTION
What are the ideas behind the Fourier transform?
Answer:
- All periodic sounds are made of a combination of sine waves.
- These sine waves may vary in amplitude (how big they are), phase angle (where they are in
cycle relative to each other), and frequency (there can be many frequen- cies present in sound).
COMD 5070 Exam 3 (New 2024/2025 2
Update) Acoustics of Speech and Hearing
, QUESTION
What does the Fourier transform create?
Answer:
A spectrum from a time domain waveform.
QUESTION
What is the FFT?
Answer:
- Fast Fourier Transform
- Term used when applying the Fourier theorem.
QUESTION
What does the FFT do?
Answer:
- Goes from a time domain waveform to a frequency domain display.
- Takes a complex waveform and breaks it into a spectrum that shows individual components.
QUESTION
What is the FFT good and bad at?
Answer:
Reveals the source and harmonic energy but is bad at showing formant energy.
QUESTION
What is stroboscopy?
Answer:
A flash of light that illuminates the vocal folds in a particular position, it is a slow-moving
representation of glottal fold oscillation.
COMD 5070 Exam 3 (New 2024/2025 3
Update) Acoustics of Speech and Hearing
, QUESTION
What happens with a stroboscopy?
Answer:
It captures a variety of different positions from open to closed to resting position over successive
cycles.
QUESTION
What does a stroboscopy rely on?
Answer:
- Animation.
- Has 30 frames/ second.
- Has to sync to fundamental frequency.
QUESTION
What can be viewed in real time?
Answer:
A stroboscopy.
QUESTION
What is vocal perturbation?
Answer:
- When voice is perturbed away from perfectly periodic repetition.
- Includes jitter and shimmer.
QUESTION
What can vocal perturbation be caused by?
Answer:
Neurologic factors, airflow tur- bulence, or pathological tissue change (swelling, nodules, or
polyps).
COMD 5070 Exam 3 (New 2024/2025 4
Update) Acoustics of Speech and Hearing
Update) Acoustics of Speech and Hearing|
Questions and Verified Answers| 100%
Correct| Graded A
QUESTION
On a 3D spectrogram, how high does the frequency go relative to the sample rate?
Answer:
- Nyquist frequency (which is twice the frequency of the highest frequency component).
QUESTION
If interested at looking at high frequency speech components on a spec- trogram, you should do
what?
Answer:
At least double the sample rate, and give it a little more safety margin above that.
QUESTION
What is a high pass filter?
Answer:
High frequencies pass through, low frequencies are held back.
QUESTION
What is a low pass filter?
Answer:
Low frequencies pass through and high frequencies are held back.
COMD 5070 Exam 3 (New 2024/2025 1
Update) Acoustics of Speech and Hearing
, QUESTION
What is a band pass filter?
Answer:
Allows a band of frequencies to pass through, holds back both higher and lower frequencies.
QUESTION
What is a band reject filter?
Answer:
Allows higher and lower frequencies to pass through, holds back a band of frequencies.
QUESTION
Who created the Fourier transform?
Answer:
Joseph Fourier.
QUESTION
What is the Fourier transform?
Answer:
A way to analyze and split complex sounds.
QUESTION
What are the ideas behind the Fourier transform?
Answer:
- All periodic sounds are made of a combination of sine waves.
- These sine waves may vary in amplitude (how big they are), phase angle (where they are in
cycle relative to each other), and frequency (there can be many frequen- cies present in sound).
COMD 5070 Exam 3 (New 2024/2025 2
Update) Acoustics of Speech and Hearing
, QUESTION
What does the Fourier transform create?
Answer:
A spectrum from a time domain waveform.
QUESTION
What is the FFT?
Answer:
- Fast Fourier Transform
- Term used when applying the Fourier theorem.
QUESTION
What does the FFT do?
Answer:
- Goes from a time domain waveform to a frequency domain display.
- Takes a complex waveform and breaks it into a spectrum that shows individual components.
QUESTION
What is the FFT good and bad at?
Answer:
Reveals the source and harmonic energy but is bad at showing formant energy.
QUESTION
What is stroboscopy?
Answer:
A flash of light that illuminates the vocal folds in a particular position, it is a slow-moving
representation of glottal fold oscillation.
COMD 5070 Exam 3 (New 2024/2025 3
Update) Acoustics of Speech and Hearing
, QUESTION
What happens with a stroboscopy?
Answer:
It captures a variety of different positions from open to closed to resting position over successive
cycles.
QUESTION
What does a stroboscopy rely on?
Answer:
- Animation.
- Has 30 frames/ second.
- Has to sync to fundamental frequency.
QUESTION
What can be viewed in real time?
Answer:
A stroboscopy.
QUESTION
What is vocal perturbation?
Answer:
- When voice is perturbed away from perfectly periodic repetition.
- Includes jitter and shimmer.
QUESTION
What can vocal perturbation be caused by?
Answer:
Neurologic factors, airflow tur- bulence, or pathological tissue change (swelling, nodules, or
polyps).
COMD 5070 Exam 3 (New 2024/2025 4
Update) Acoustics of Speech and Hearing
