Saltar navegación

Activa JavaScript para disfrutar de los vídeos de la Mediateca.

Files - What We and Dogs Hear

Ajuste de pantalla

El ajuste de pantalla se aprecia al ver el vídeo en pantalla completa. Elige la presentación que más te guste:

Subido el 28 de mayo de 2007 por EducaMadrid

554 visualizaciones

NASA Why? Files segment comparing how humans hear to how dogs hear.

Más información Transcripción

Descargar la transcripción

Too bad PJ couldn't make it. 00:00:00
Look, what or who is that? 00:00:02
Oh, that's Fred the Head. 00:00:05
You must be the treehouse detectives. 00:00:07
I'm Bianca, and this is Jacob. 00:00:09
We're trying to solve a really big problem. 00:00:11
Dogs are barking and keeping us up at night and in the early morning. 00:00:13
I heard about that on the news. 00:00:16
We think that a really loud sound might be making them bark. 00:00:18
We're researching sound. 00:00:21
We'd like to learn how you deal with sound problems. 00:00:23
Well, I'm a psychoacoustician here at Nassau Langley Research Center. 00:00:26
That's a really big word. 00:00:29
I don't think I can even say that. 00:00:31
So what do you do here? 00:00:33
Well, as a psychoacoustician, I design, conduct and analyze tests 00:00:35
and investigate the psychological effects of noise on people. 00:00:39
Let me show you one of my labs. 00:00:42
Is this a real plane? 00:00:45
No, this is a fake. 00:00:47
But we go up in real planes and we make recordings 00:00:49
and we bring them down to the lab and we modify them. 00:00:51
Then we can play them back to people in here 00:00:53
and find out which kind of sounds they prefer. 00:00:55
So what kind of sounds do people prefer? 00:00:58
Well, quiet ones really. 00:01:00
We hear from 20 vibrations per second to 20,000 vibrations per second. 00:01:02
And the low frequency ones bother us less than the high frequencies. 00:01:07
For instance, have you heard a piece of chalk scratching on a chalkboard? 00:01:11
Yuck! 00:01:15
Well, that's a high frequency sound. 00:01:16
What about dogs? Do they hear differently from us? 00:01:17
Well, I'm not an expert on dogs, but I know dogs can hear higher frequencies than we do. 00:01:20
They can hear very high frequencies. 00:01:24
Come on, let's go. 00:01:26
So, we need to find out what kind of things make very high frequency noises. 00:01:31
What about a machine or a factory? 00:01:35
They both might be possibilities. 00:01:37
That could be it. It could be a noise from a nearby factory. 00:01:39
We might have the answer. 00:01:42
You mean the hypothesis. 00:01:43
You need to go and talk to my friend veterinarian. 00:01:45
His name's Dr. Gooding. 00:01:48
Oh, here he is. He's right around the corner. 00:01:49
Great. I love going to pet hospitals. 00:01:52
I'll call my parents and see if it's okay. 00:01:54
I wonder what kind of neat pets we will see today. 00:01:57
Hi, we're the Treehouse Detectives. We're here to see Dr. Gooding. 00:02:00
Please come this way. How can I help you? 00:02:03
Thanks for helping us. I'm Jacob, and this is Bianca. 00:02:10
Have you heard about the dog barking problem on KSNN? 00:02:13
Yes, I have. I know it's keeping a lot of people up at night. 00:02:16
Tell me about it. 00:02:20
We need to know dogs hear sounds differently from us. 00:02:21
Whoa, look at that big dog. I know he can hear us. 00:02:25
Yes, dogs tend to hear at a much higher frequency than human beings. 00:02:30
This means they can hear sounds that the human ear cannot hear. 00:02:34
Dogs can hear sounds between 67 Hz and 45 kHz. 00:02:38
Now, people can only hear between 20 Hz and 20 kHz. 00:02:43
Do the insides of dogs' ears look like ours? 00:02:47
What? 00:02:50
That's actually a good question. I have something to show you. Let's go, guys. 00:02:51
Let's take a look at Millie's ears. 00:02:59
Actually, the anatomy of the human ear is similar to that of the dog. 00:03:02
Those are actual pictures of Millie's ears. 00:03:06
However, dogs have some equipment or parts that might have better hearing. 00:03:09
For example, dogs tend to have a long ear canal that might allow sound to be funneled or directed into the hearing apparatus. 00:03:14
It's a lot like this funnel, something that is used to direct water into this bottle so that you don't spill it. 00:03:22
So that's why dogs can hear noises at higher frequencies. 00:03:37
They can hear things that we can't. 00:03:41
That's true. Dogs used to be wild before they were domesticated. 00:03:43
They had to survive by finding food and escaping predators. 00:03:48
Therefore, they might have had to depend on their ears to survive. 00:03:52
That's cool. Dr. Gooding, do you know any good examples of high-frequency sounds? 00:03:56
Hmm, let's see. Are you familiar with dog whistles or pest zappers? 00:04:00
These are good examples of high-frequency sounds. 00:04:06
Thanks, doctor, for all your information. 00:04:09
We'll see you later. 00:04:12
Valoración:
  • 1
  • 2
  • 3
  • 4
  • 5
Eres el primero. Inicia sesión para valorar el vídeo.
Idioma/s:
en
Niveles educativos:
▼ Mostrar / ocultar niveles
      • Nivel Intermedio
Autor/es:
Office of Education
Subido por:
EducaMadrid
Licencia:
Reconocimiento - No comercial - Sin obra derivada
Visualizaciones:
554
Fecha:
28 de mayo de 2007 - 15:32
Visibilidad:
Público
Enlace Relacionado:
NASAs center for distance learning
Duración:
04′ 14″
Relación de aspecto:
4:3 Hasta 2009 fue el estándar utilizado en la televisión PAL; muchas pantallas de ordenador y televisores usan este estándar, erróneamente llamado cuadrado, cuando en la realidad es rectangular o wide.
Resolución:
480x360 píxeles
Tamaño:
25.48 MBytes

Del mismo autor…

Ver más del mismo autor

EducaMadrid, Plataforma Educativa de la Comunidad de Madrid

Plataforma Educativa EducaMadrid