Factors that affect the frequency of vibration
- Identify two factors that affect the frequency of vibration and describe the way in which each factor affects frequency.
a. _____________________________________________
b. _____________________________________________
- __________________ is the restoring force that causes air particles to bounce back when displaced. ___________________ is the force which permits an air particle to move beyond its theoretical “resting” position during vibration.
- An amplitude spectrum displays ___________ information as a function of _____________. The amplitude spectrum of a complex periodic waveform is called a(n) _________________. The amplitude spectrum of an aperiodic complex waveform is called a(n) ______________________.
- Deviation of a sinusoidal wave from the zero line to its peak or trough is known as ________________.
- The time it takes for a complex quasi-periodicwaveform to complete one cycle of vibration is called ___________________.
- What is the frequency of a sinusoidal waveform having a wavelength of 1.372 meters? ______________
- If a speaker produces the vowel /u/ two times, first at an foof 230 Hz and then again at 250 Hz, the (TRANSFER FUNCTION / GLOTTALSOURCE / BOTH GLOTTAL SOURCE AND TRANSFER FUNCTION)has/have changed.
- Two 120 Hz sinusoidal waves, having peak-to-peak amplitudes of 0.0008 dynes/cm2and .0004 dynes/cm2are shifted in time by one-half period. These two waves are said to be _ degrees out-of-phase. Describe the waveform that would result if these two sound waves were added together:
TYPE OF WAVEFORM ___________________
FREQUENCY ___________________
PEAK AMPLITUDE ___________________
- If a speaker produces the vowel /i/ at 100 Hz and then the vowel /u/ at 150 Hz, the ( TRANSFER FUNCTION / GLOTTAL SOURCE / BOTH GLOTTAL SOURCE AND TRANSFER FUNCTION )has/have changed.
- According to the Acoustic Transmission Line resonance model, the vocal tract can be modeled after a uniform tube which is closed at the _ end and open at the . This system is known as a(n) ____ resonator. It can only be applied to the resonance characteristics of one American English vowel: _.
- During vowel production, the cross-sectional area of the vocal tract is determined by: __________________; __________________ and __________________.
- Using the Double Helmholtz Resonatormodel, explain why, among American English vowels, F1 and F2 are maximally divergent for the vowel /i/.
A. Examine the waveforms below. They occur simultaneously in the same medium. Amplitude values are expressed in millivolts (mV). (20 points)
4.5
/ ŋ /
/ j /
/ s /
/ dʒ/
/ h /
/ w /
/ i /
/ tʃ /
/ Ө /
/ k /
TIME (msec)
For each waveform, describe the following (remember to include units of measurement):
Wave A Wave B
Period: _ _
Frequency: _ _
Peak Amplitude: _ _
Peak-to-peak Amplitude: _ _
Wavelength: _ _
Describe the phase relationship between:
Waves A and B. ____________________________
In the space below draw the resulting waveform and spectrum (label both axes and provide units of measurement)
B. The figure below shows a few cycles of a sustained /a/ production at a speaker’s comfortable pitch and loudness. Amplitude is in milliVolts (mV) (20 points)
+12
-12
0 3.5 7
Time (ms)
- What is the fundamental period of this waveform? _
- What is the fundamental frequency of this waveform? _
- What is the period of the first harmonic? _
- What is the frequency of the first harmonic? __
- What is the frequency of the fifth harmonic? __
- What is the maximum peak-to-peak amplitude (in Volts)? __
- What is the maximum peak amplitude (in Volts)? __
- Compute the wavelength of this signal propagated in air (assuming normal atmospheric conditions) ____
- Was this /a/ produced by an adult male, adult female, or child? __