O (4)

Question 1

What is the purpose of cepstral liftering in signal processing?

Answer 1

To separate components of distinct spectral properties in the lag (or quefrency) domain

This technique allows for the transformation back into log-magnitudes or magnitudes in the frequency domain.

Question 2

In cepstral analysis, what can be estimated from the periodicity of the voice and the vocal-tract filter?

Answer 2

Both can be estimated

An example is illustrated using the vowel [i] from the word ‘linear’.

Question 3

True or false: Cepstral analysis can be used to analyze the spectral properties of signals.

Answer 3

TRUE

It helps in separating components based on their distinct spectral properties.

Question 4

What does the spectral envelope of a vowel indicate in cepstral analysis?

Answer 4

It indicates the magnitude of the signal over time

Example shown for the vowel [i].

Question 5

Fill in the blank: The components in cepstral analysis may be transformed back into _______ in the frequency domain.

Answer 5

log-magnitudes or magnitudes

This transformation is essential for further analysis.