SPPA 6010 Advanced Speech Science

1. Draw and label a glottal source spectrum with a fundamental frequency of 250 Hz.

2. Two consecutive harmonics in a glottal source spectrum are measured to be 1400 Hz and 1600 Hz. What is the fundamental frequency of this sound?

3. Draw and label a glottal area waveform for modal phonation and an oscillatory frequency of 150 Hz.

4. How would an electroglottographic waveform look when measuring the same behavior outlined in question 3?

5. Why do we say that the human voice is a quasi-periodic signal?

6. Based on your understanding of vocal fold vibration, explain why boys would have a change in their voice at puberty?

7. Draw and label the following

a. Five cycles of a sound pressure waveform of a sustained vowel b. Same five cycles with an increased jitter value c. Same five cycles with an increased shimmer value

8. Draw and label the following a. An amplitude spectrum for a sustained vowel b. Same vowel with a reduced signal to noise ratio

9. Draw and label hypothetical glottal area waveforms for modal, glottal fry and falsetto registers.

10. Draw and label an input spectrum, frequency response curve and output spectrum for a male producing the vowel /u/. How would this differ if the person was whispering the vowel?

11. Calculate the first three formants for uniform tubes, closed at one end with the following lengths.

a. 12 cm b. 15 cm c. 19 cm

c=35,000 cm/sec 12. Draw and label the frequency response curve for the tube in 10a.

13. Draw and label stylized spectrograms and spectrum envelopes for the four corner vowels.

14. Based on your understanding of the Stevens and House model of vowel articulation, how might bilateral paralysis of the facial (and lip) muscles affect vowel formant values? What vowels might be most problematic for this speaker?