outer ear

Question 1

Where is the hearing mechanism located

Answer 1

temporal bone

Question 2

What is the function of the external ear

Answer 2

protect the delicate middle ear
provides gain for the high frequencies
provides cues for localization of sound sources

Question 3

What is the input for the outer ear

Answer 3

sound from a loudspeaker at specified angles and a fixed distance (hanging from ceiling)

Question 4

What is the output for the outer ear

Answer 4

the level of the sound from the loudspeaker at the person’s eardrum

Question 5

What is an azimuth (examples)

Answer 5

horizontal direction expressed as the angular distance between a fixed point and the direction of an object

in front of person = 0°
behind person = 180°

Question 6

What is 100 Hz wavelength equal to

Answer 6

basketball hoop

Question 7

What is 1000 Hz wavelength equal to

Answer 7

length of your foot

Question 8

What is 10,000 Hz wavelength equal to

Answer 8

half the length of your thumb

Question 9

How does a spherical head impact directional pressure gains?

Answer 9

when sound is presented to it, it strikes it and then bounces off, and at high frequencies it can bounce off and add to the sound coming in

Question 10

How does the ear canal impact directional pressure gains?

Answer 10

modeled as a one end closed tube with hard walls
measurements from ear canals show a resonance at 2.6 kHz

Question 11

How does the concha impact directional pressure gains?

Answer 11

smaller cavity than the ear canal
resonant frequency is effected

Question 12

Is the external ear linear?

Answer 12

Yes

if you measure its response to pure tones, you can predict its response to speech and other complex sounds

it doesn’t produce distortion