COMD 5070 Final Exam (Latest 2023/ 2024 Update) Acoustics of Speech and Hearing| Questions and Verified Answers| 100% Correct| Grade A

COMD 5070 Final Exam (Latest 2023/ 2024

Update) Acoustics of Speech and Hearing|

Questions and Verified Answers| 100%

Correct| Grade A

Q: what is the Nyquist frequency?

Answer:

half the sample rate

Q: if you want to go up one octave, you ______ the frequency.

Answer:

double

Q: if you want to go down one octave, you ______ the frequency.

Answer:

halve

Q: what does a high pass filter do?

Answer:

allows high frequencies through

Q: what does a low pass filter do?

Answer:

allows low frequencies through

Q: what does a band pass filter do?

Answer:

allows a band of frequencies through (mid)

Q: what does a band reject filter do?

Answer:

holds back/attenuates a band of frequencies (allows high and low frequencies)

Q: what does a Fourier transform do?

Answer:

creates a spectrum from the time domain waveform (deconstructs the waveform)

Q: what is the cake analogy to a Fourier transform?

Answer:

analyze a cake to learn its ingredients

Q: what does a time domain display show?

Answer:

-a waveform represents sound directly

-air pressure changes over time

Q: what does a frequency domain display show?

Answer:

a line spectrum shows the frequency components of a periodic sound

Q: what is a FFT spectrum?

Answer:

fast Fourier transform

-shows harmonic energy

-each peak is a harmonic

-less clear at showing formants

Q: what is FFT reveal more of?

Answer:

vocal SOURCE

Q: what is a LPC spectrum?

Answer:

linear predictive coding

-shows spectral envelope (doesn't show individual harmonics)

-good at revealing formants

Q: what does a LPC spectrum reveal more of?

Answer:

vocal tract FILTER