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Flashcards in Outer ear Deck (15)
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0
Q

What does the pinna do?

A

Gives a different freq response so we can localize a sound coming from the side

1
Q

Visible part is the ..

A

Pinna / auricle

2
Q

Less visible part …

A

The external auditory canal

3
Q

Deep centre portion ..

A

Concha

4
Q

Diameter of concha

A

1-2 cm

5
Q

What does concha do?

A

Leads to external auditory meatus

6
Q

How long is EAC?

A

2-3cm

Different people have diff lengths

7
Q

What makes up lateral portion of EAC?

A

Cartilage, containing glands that produce cerumen

8
Q

What makes up medial portion of EAC?

A

Bony, tight skin lining close to tympanic membrane

Lots of vessels and nerve endings

9
Q

Function of outer ear

A

Protection
Amplification
Localization

10
Q

Head related transfer function

A

At high freq sounds we lose more of the amplitude

High frequencies are amplitude cues

11
Q

Types of cues provided by the ear

A

Inter aural intensity cues

Inter aural timing cues

12
Q

Interaural intensity cues

A

Input is compared in terms of. Intensity

More effective for high freq’s

13
Q

Interaural timing cues

A

Input compared in terms of time of arrival

More effective for low freq’s

14
Q

Ear canal resonance

A

Biggest pressure gain is at the place where soft sounds have frequencies
The resonant characteristics of the ear canal amplify the speech frequencies