Acoustic Measures

Question 1

When you are looking for measures for vocal instability, what measures can you use?

Answer 1

Jitter and Shimmer. Measures of short term variability that is cycle to cycle variability in fundamental period and peak amplitude. Higher Jitter and Shimmer values will be high for vocal instability.

Question 2

Frequency Perturbation

Answer 2

Of limited value. Commonly referred to as Jitter. Cycle to cycle variability in fundamental period.

Question 3

Amplitude Perturbation

Answer 3

Of limited value. Commonly referred to as Shimmer. Cycle to cycle variability in peak amplitude.

Question 4

A CEPSTRAL analysis generates a….

Answer 4

KEPSTRUM

Question 5

CEPSTRAL Peaks (benefit)

Answer 5

has really good potential for voice analysis.

Question 6

Why are Jitter and Shimmer of limited value?

Answer 6

Estimates of FO and Jitter are based on either a zero crossing method or a peak picking method. As long as it is quasi periodic it will track well. But for aperiodic sounds the values are not easily found even when there is roughness.

Question 7

What can you use to measure vocal instability for any sound?

Answer 7

spectrography

Question 8

KEPSTRUM

Answer 8

a spectrum of a spectrum. k-quency