Lesson 23

Question 1

The function of a microphone is to

Answer 1

convert acoustic energy into electrical energy

Question 2

Coupling in a hearing instrument refers to connecting

Answer 2

one stage of an amplifier to the next

Question 3

The ‘T’ position on a hearing aid can be switched to

Answer 3

amplify telephone, couple a hearing aid into a loop inductor system, couple directly into the audio of a radio or TV set with a separate induction coil

Question 4

The following components can change or modify the frequency response of a hearing instrument

Answer 4

a microphone

Question 5

The following is a transducer

Answer 5

electret microphone

Question 6

Amplifiers

Answer 6

generate distortion

Question 7

The linear amplifier has a 1:1 relationship. This means that if you rotate the volume control on a linear aid, you change

Answer 7

the gain and the output

Question 8

Hard peak clipping occurs in a

Answer 8

class A amplifier

Question 9

Peak rounding

Answer 9

causes harmonic distortion above the knee

Question 10

There are two types of compression - input and output. The difference is

Answer 10

the placement of the feedback loop