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Authoritative PPT Summary
"How Do We Hear Sounds" Various Sound PPT Courseware
1. Structure of the human ear
The basic process of how people perceive sound
Voices from the outside world
eardrum vibration
Spreads through the ossicles and other tissues
auditory nerves transmit signals
Brain produces hearing
Common sense introduction: Normal hearing is caused by sound waves passing through the external auditory canal, causing the tympanic membrane to vibrate, and then entering the ear through the ossicles and other tissues. This sound transmission path is called air conduction. (gas sound transmission)
Discussion: Why can’t some people hear the sound?
3. What is deafness?
1) During the entire process of sound transmission to the brain, if any part is blocked (such as damage to the eardrum, auditory ossicles, or auditory nerve), the person will lose hearing, leading to deafness.
2) Nervous deafness and non-nervous deafness
(1) Deafness caused by damage to the auditory nerve is neurological deafness, which cannot be cured.
(2) Deafness caused by obstacles in the conduction of sound (such as damage to the tympanic membrane and auditory ossicles) is non-nervous deafness, which can be cured.
2. Bone conduction
Sound can also be transmitted to the auditory nerve through the skull and jaw, causing hearing. In physics, this method of sound conduction is called bone conduction. (Solid sound transmission)
three. binaural effect
Since the distance from the sound source to the two ears is generally different, the time, intensity and other characteristics of the sound reaching the two ears are also different. These differences are an important basis for judging the direction of the sound source. This is the binaural effect.
application:
1. How to place multi-channel speakers?
2. What is the function of the owl's ears moving up and down?
Assignments and exercises
1. We can hear sound, the correct propagation path: ( )
A. Good ears → medium → object vibration
B. Medium → object vibration → good ears
C. Object vibration → medium → good ears
D. Object vibration → good ears → medium
2. The following are the types of hearing caused by bone conduction:
A. Plug your ears and place the tail of the vibrating tuning fork against your teeth to hear the sound.
B. The doctor uses a stethoscope to listen to the patient's heart sounds
C. Plug your ears with your fingers to listen to the sound of the tuning fork
D. The students heard the whispers of other students in their ears.
3. In the process of transmitting sound to the brain, malfunction of the following parts will cause people to lose hearing: ( )
A. Auricle B. Tympanic membrane
C. Ossicles D. Auditory nerve
knowledge application
do you know? Snakes have no ears. However, if a snake puts its head on the ground, a bone in its head will receive the sounds made by the animals approaching it. It can be seen that snakes use _____ to "listen" of enemies and prey.
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