HAT 1 Hearing Aid Components

Question 1

What are the components of a hearing aid?

Answer 1

M - microphone
A - amplifier
R - receiver
B - battery
S - stuff

Question 2

What is a hearing aid?

Answer 2

An electronic device that enables a hearing-impaired individual make maximum use of their residual hearing.

Question 3

What does a hearing aid do? (4)

Answer 3

Optimises speech intelligibility
Maximises information form other sounds
Minimises distortion
Minimum interference from background noise

Question 4

What colour is a 10 zinc air battery?

Answer 4

Yellow

Question 5

What colour is a 312 zinc air battery?

Answer 5

Brown

Question 6

What colour is a 13 zinc air battery?

Answer 6

Orange

Question 7

What colour is a 675 zinc air battery?

Answer 7

Blue

Question 8

How do you work out the time a battery has left?

Answer 8

Time = capacity / current

T - hrs
C - mA
I - mAhrs

Question 9

Draw the wire diagram of a hearing aid

Answer 9

Question 10

What is an omnidirectional microphone?

Answer 10

It will respond equally to sounds from all directions. 360 degree coverage

Best used for quiet environments
Slight directionality due to head shadow effect

Question 11

What is a directional microphone

Answer 11

2 microphones and 1 hole or 2 holes and 1 microphone

The delay between the 2 are subtracted to calculate direction

Question 12

Name 3 polar plots

Answer 12