The Audiogram

Question 1

What is represented logarithmically on the abscissa (x-axis)?

Answer 1

Frequency in Hertz (Hz)

Question 2

What is represented logarithmically on the ordinate (y-axis)?

Answer 2

Hearing Level in Decibels (dB)

Question 3

T/F The line for 0 dB is the same shade as the rest of the graph.

Answer 3

False; the 0 dB line is darker to signal the average threshold (to stand out from the other lines)

Question 4

T/F One octave on the frequency scale is equivalent in span to 20 dB on the HL scale.

Answer 4

True

Question 5

What is the range of the abscissa?

Answer 5

125-8000 Hz

Question 6

What is the range of the ordinate?

Answer 6

-20 to 120 dB HL

Question 7

Symbol for: Air Conduction, Right Ear, Unmasked

Answer 7

O

Question 8

Symbol for: Air Conduction, Left Ear, Unmasked

Answer 8

X

Question 9

Symbol for: Air Conduction, Right Ear, Masked

Answer 9

Triangle

Question 10

Symbol for: Air Conduction, Left Ear, Masked

Answer 10

Square

Question 11

Symbol for: Bone Conduction, Right Ear, Unmasked

Answer 11

<

Question 12

Symbol for: Bone Conduction, Right Ear, Masked

Answer 12

[

Question 13

Symbol for: Bone Conduction, Left Ear, Unmasked

Answer 13

>

Question 14

Symbol for: Bone Conduction, Left Ear, Masked

Answer 14

]

Question 15

Assumptions of results plotted on an audiogram: (2)

Answer 15

1. Some physical quantity has been specified as a reference

2. The conditions of measurement have been specified and meet a specified standard (calibration)

Question 16

Physical Quantities

Answer 16

1. Threshold - statistical concept; not a direct property of a system; can be manipulated by varying the criteria for a ‘yes I hear it’ response
2. Physical Quantity Reference - measurement of auditory sensitivity must be referenced to some absolute physical quantity

Question 17

Calibration for Earphones uses:

Answer 17

A coupler

Question 18

A coupler generally offers the same ____ ____ as the human ear under an earphone

Answer 18

Acoustic Impedence

Question 19

Threshold SPL measures made with a microphone placed where the head of a listener would be under test

Answer 19

Sound Field

Question 20

For calibration of a sound field you use _______.

Answer 20

Minimum Audible Field (MAF)

Question 21

The minimum audible SPL at each frequency corresponds to __ dB HL on the audiometer

Answer 21

0

Question 22

Thresholds measured with an audiometer are based on a _____ measure of auditory sensitivity with response to an ____ physical quantity of auditory sensitivity.

Answer 22

Relative; Absolute