IHS Instrument Fitting 4

Question 1

The input/output curve of a hearing aid with wide dynamic range compression (WDRC) shows gain decreasing as input level rises. This means the compression ratio:

Accepted Answer

Is greater than 1:1

Answer

A compression ratio greater than 1:1 means output increases less than input, providing more gain for soft sounds and less for loud sounds.

Question 2

Which of the following best describes the attack time of a hearing aid compressor?

Accepted Answer

Time for gain to decrease after a loud sound onset

Answer

Attack time is how quickly the hearing aid reduces gain in response to a sudden loud input signal.

Question 3

A patient with a flat 50 dB HL hearing loss consistently rejects hearing aids because loud sounds are uncomfortable. The fitting adjustment MOST likely needed is:

Accepted Answer

Lower the MPO/OSPL90 setting

Answer

Reducing the maximum power output (MPO) prevents the hearing aid from reaching uncomfortable loudness levels for the patient.

Question 4

In the context of hearing aid programming, 'acclimatization' refers to:

Accepted Answer

Gradually increasing gain over time to help new users adapt

Answer

Acclimatization features start with reduced gain and automatically or manually increase it as the user adjusts to amplification.

Question 5

When using a Knowles Electronic Manikin for Acoustic Research (KEMAR), the hearing aid fitting professional can:

Accepted Answer

Simulate real-ear measurements on a standardized head and ear canal

Answer

KEMAR is an acoustic manikin that allows real-ear simulation measurements in a controlled, repeatable environment.

IHS - International Hearing Society Practice Test

IHS - International Hearing Society Practice Test

IHS Instrument Fitting 4