Besides normal voices, HGG has been applied to selected clinical cases of voice disorders. Two types of irregularities have been measured: there is a frequency difference either between left and right vocal folds horizontal asymmetry or on one side between the ventral and dorsal third vertical asymmetry.
By modeling, both categories of irregular motion curves can be explained in detail. Materials Per Class: balloons 1 for each student a chair 10—15 pairs of scissors whoopee cushion for optional activity in Part 3 Key Questions Part 1 When we are talking to each other, which parts of our bodies form the sounds and words we use?
Part 2: Speaking involves air and muscles Blow up a balloon and make sounds by letting the air out. Stretch the neck of the balloon to make a high sound and slacken it to make a low sound.
This represents the stretching of the vocal cords to vary pitch. Hand out the balloons to the students. Challenge them to produce various pitches with their balloons. Repeat Part 1 several times, adjusting the pitch higher, lower and volume louder, softer. Now try it without making your vocal cords move. Teacher Tip: This part also works well as a classroom demonstration.
Part 3: A fun application of air, vibration and muscles: the fart whistle! Choose a volunteer to sit on a chair facing the students. Ask them to stand up then sit down, and repeat several times. Sneak a whoopee cushion onto their chair at some point, just before they sit down! The vocal cords are two stretched folds of tissue, one from each side of the larynx, or Adam's Apple. When you sing, your vocal cords vibrate between fifty-five and one thousand times per second , depending on the note.
The higher the note, the faster the vibration. The notes then resonate in the upper throat, and the oral and nasal cavities where they get their richness and harmonic overtones. After leaving the larynx, the notes pass the teeth, tongue, cheeks and lips. How cool is that?!
The term for vibrations, or cycles, per second, is Hertz. It's abbreviated Hz, but we still say "Hertz. How it Works Air comes out of the lungs, through the trachea, and into the larynx. The air makes the vocal folds vibrate.
When the vocal folds vibrate, they alternately trap air and release it. Each release sends a little puff of air into the pharynx; each puff of air is the beginning of a sound wave see Acoustics: Sound Waves and How They Move. The sound wave is enhanced as it travels through the pharynx; by the time it leaves the mouth, it sounds like a voice. The Role of the Nervous System Nerves come from the brain to the brain stem a lower, more primitive center of the brain or to the spinal cord, and then go out to muscles and tissues of the body.
Figure For all you singers. For Your Information Vocal Registers Singers are well aware that they can sing a single pitch in a variety of different ways, or sing a series of pitches with a consistent quality, that may differ from another series of pitches with a different, but consistent, quality. Loudness is pretty complex -- lots of factors affect loudness. For Your Information Remember that the glottis is the space between the two vocal folds. For Your Information Keep in mind that, depending on the pitch of the sound, each cycle of vibration can be occurring within one sixtieth of a second or at any speed up to nearly one two-thousandth of a second!
What causes stronger explosions of air going into the glottis? How does the closed phase get longer? What happens to the opening phase when more air pressure builds up?
Interesting Facts To see how the vocal folds vibrate, purse your lips and blow; this is similar to vocal fold vibration. Watson Award Dr. Ojebuoboh Bayardo I. Garay Caleb D. Vogt Dalton Hermans Dieter D. Quesada Diaz Elizabeth C. Okafor Fathima A. Mohamed Guldamla Kalender Jacob A. Noeker Jenna K. Dick Joel Pardo John B. Betancourt Julia A. Riedl Kacey Guenther Katherine E.
0コメント