VF vibration Flashcards Preview

voice disorders > VF vibration > Flashcards

Flashcards in VF vibration Deck (22):
1

Vertical Phase Difference

inferior margins of the vocal folds open first and close first.superior margins open last and close last

2

Longitudinal Wave

posterior portion of vocal folds open first and close lastanterior portion opens last and close first

3

The goal of VF waves is to

SHAPE the air pressure released by the glottis

4

Describe the 1-Mass Model of VF Vibration

the mass of one VF is represented by a rectangular block.the spring signifies the recoil force of the VFsthis model fails to fully explain VF vibration because there is a lot MORE movement

5

Describe the 3-Mass Model of VF Vibration

made to overcome the limitations of the 1 mass model.M=body mass=lateral movementsM1 and M2=cover masses=vertical phase differences

6

Different degrees of adduction result in....

perceptual voice features such as normal, breathy, and pressed vocal quality.

7

What causes a breathy voice?

the folds start vibrating before closure is achieved, full closure is not reached

8

What causes a pressed voice?

very high medial compression forces

9

What is fundamental frequency?

the rate of vibration of the VFs (Fo)corresponds to perceptual pitch

10

What is the sound source for speech?

laryngeal vibration

11

How long does a single cycle of opening and closing of the VF take?

~1/100th of a second

12

How many times a second does this cycle repeat itself?

100-250 times/secdepends on male/female

13

What creates the sound we hear?

"puffs of air" that are released during each cycle NOT the impact of the folds coming together

14

What is the glottal spectrum?

the numerous energies that are produced by the vibrating vocal folds....for example harmonics

15

How many harmonics are present in the human voice?

~40

16

If the Fo of an individual's VFs is 100 Hz, then what energies do the harmonics of the sound-wave created?

100x2=200100x3=300

17

As Fo increases....what happens to harmonics?

harmonics spread outFo=200200x2=400200x3=600200x4=800....

18

What can enhance or suppress harmonics?

the shape of the vocal tract (acts as a filter)

19

VF do not vibrate in a completely even manner due to..

variations in tissu structure, variations in lung pressures, VF length and symmetry differences

20

What is jitter?

the timing variability between cycles of vibration.frequencies

21

Which populations have higher jitter values?

children and elderly

22

What is shimmer?

differences in amplitude from one cycle to the nextloudness