Fitting Verification

Question 1

What is a free field

Answer 1

A large outdoor area with no surfaces to reflect sound. An anechoic chamber approximates a free field without reflections or echoes

Question 2

Because sound speech measurements approximate real life situations, how should they be tested when verifying

Answer 2

They should be tested in a sound field rather than a controlled environment like a sound booth and the speaker placement should be at 0 degrees and 1 meter

Question 3

ANSI standards add how many dB to convert speech from HL to SPL

Answer 3

Add 20dB

You subtract 20dB if you use the audiometer circuit in sound field

Question 4

What does 10dB S/N mean

Answer 4

Means the words are 10dB louder than the background noise.

Question 5

When a probe microphone tip is used in the ear canal, what does functional and use gain become

Answer 5

Insertion Gain

Question 6

The signal/Noise ration of a HA response is

Answer 6

The difference in decibels between the signal and the noise in the system

Question 7

Acoustic gain is measured in:

Answer 7

Decibels SPL

Question 8

High frequency Average (HFA) full on gain is measured by averaging the gain at:

Answer 8

1000,3000 and 4000 Hz

Question 9

High Frequency Average SSPL,90 (HFA SSPL 90) refers to

Answer 9

High frequency average saturation sound pressure level with a 90dB SPL input

Question 10

The Saturation Sound Pressure level should:

Answer 10

Directly relate to the clients UCL

Question 11

ANSI standards can compare:

Answer 11

One instrument to another

Question 12

The SSPL 90 curve measures

Answer 12

All the tones across frequency

Question 13

All ANSI Intrument measurements are

Answer 13

SPL

Question 14

Input sound pressure is measured:

Answer 14

At the microphone opening of the hearing instrument

Question 15

Gain control is another name for

Answer 15

Volume wheel

Question 16

Basic verification involves

Answer 16

Checking MCL and UCL in quiet and noise

Question 17

Verification procedures

Answer 17

Check the accuracy of your fitting

Question 18

An effective verification is

Answer 18

A measurable improvement in communication

Question 19

Functional Gain of the instrument

Answer 19

Is one method of fitting verification

Question 20

Speech tests measured through the audiometer circuit

Answer 20

Are 20dB less because of ANSI Standards

Question 21

Ideally, when presenting recorded words in noise

Answer 21

The words are 10dB louder than the noise

Question 22

Sound field is

Answer 22

A controlled environment

Question 23

Most Pt’s use enough gain in the HA to understand quiet speech at a level of

Answer 23

55dB SPL

Question 24

When UCL’s are not balanced, a loud signal is perceived as

Answer 24

Lateralizing to the ear with the higher output

Question 25

The following measurements use SPL, as a reference

Answer 25

Probe microphones
Sound field thresholds
ANSI specifications