Aud•It

A free-to-use & intuitional audiometry test app, for iPad Pro 12.9

Now available on App Store

The Aud•It app is a free-to-use app, provided by Dr. King Chung of the Amplification and Communication Laboratory at Northern Illinois University at no cost. The app is intended for screening the hearing sensitivity of children and adults with between 15 dB HL and the upper limits of the app, which are transducer dependent.

A. Equipment Setup

Insert Earphones

Users will need the following equipment/components to test using the app.

a. A Y-cord with 3.5 mm TRS to dual ¼” TSF is needed to connect the iPad with the ER3A or ER5C insert earphones:

b. A pair of insert earphones with the same specifications as ER3A (e.g., ER3C, ER5C)

B. App Setup

1. Calibration of the App

Before any testing, a set of calibration values need to be entered onto the boxes on the Calibration screen. The app has a set of default calibration values for insert earphones (i.e., ER3A, ER3C, or ER5C). It is also designed with the flexibility for the user to use the transducers of preference.

To use the app with insert earphones (i.e., ER3A, ER3C, and ER5C),

a. Enter the following numbers,

b. Tap “Save to Current”, and

c. Tap “Return to Title” on the upper left hand corner to get back to the main page.

Note that the testing range for ER3A, ER3C, and ER5C insert earphones are between 20 -100 dB HL for the adult program and 15-100 dB HL for the pediatric program.

If the use of other transducers is desired, professional equipment will be needed to measure the test stimulus sound pressure level. To use the app with other transducers,

a. Tap “Clear Measured Values,”

b. Enter the “Expected Values” for the transducer and coupler from a recognized standard, e.g., ANSI/ASA standard, IEC standard, or ISO standard.

c. Enter “70” onto all the boxes in the second row “Presentation Level (dB HL),”

d. Measure the transducer output in the coupler at all the frequencies,

e. Enter the measured numbers for the left and right transducers at each frequency in Rows 3 and 4 boxes, i.e., “Left Measured Level for 70 dB HL (dB SPL)” and “Right Measured Level for 70 dB HL (dB SPL),” respectively;

f. Tap “Save to Current” for the expected values to take effects during testing;

g. Tap “Save as New” to save the calibration values for the type of transducer.

h. Tap “Return to Title” on the upper left hand corner to get back to the main page.

Note that as iPads will output a different level for different transducers, the linearity range of the app will differ, depending on the transducers. Users need to measure the linear range of the app at each frequency to estimate the valid testing range of the app.

More calibration values for other types of transducers may be disclosed.

A. Instructions to Test

1. Instructions

The instructions for the adult and pediatric programs are stated on the first page after you start the test.

2. Testing

The Aud•It app has a “Practice” and “Test” option to obtain hearing thresholds. The user can make the following choices in both choices:

· Test frequencies

o Remove Last: moves the last chosen frequency

o Clear All: ear all the test frequencies

· Test ear

· Starting ear, if testing both ears are desired

· Protocol options

o Save Protocol: save the test options

o Load Protocol: loads previously saved protocol(s)

o Delete Current Protocol: delete a saved protocol

· Language options:

o English

o Portuguese

o Spanish (coming soon)

· Interphase options:

o Adult: test stimuli are pulsed tones.

o Pediatric: test stimuli are 1/3 octave band filtered animal sounds.

· Patient information

o After taping the “Adult” or “Pediatric” option, two boxes will appear for the examiner to enter patient information.

o As the patient data can be exported to the iCloud account associated with the iPad, the examiner is cautioned to consider entering patient codes instead of using the patients’ full name to protect their personal health information.

The only difference between the “Practice” and “Test” are that, the second trial of under “Practice” is always a “No Sound” trial. This option gives a strong indication to the patient that there are “No Sound” trials in the testing process. It also allows the examiner to determine the patient understands the instructions and if re-instructions are needed. If the patient does not tap the “No Sound” button or emoji, the examiner should re-instruct.

The app also has a secondary monitoring mechanism: if the same button is pressed for five consecutive times, a button cuing for reinstruction will appear. The examiner can choose to reinstruct or restart the test.

D. Results

The results at each frequency for the left and right ears are reported in the blue and red diagrams, respectively.

The buttons located on the top of the Results screen allows two patient data management options:

· Export All Patient Data: export the results to the iCloud account associated with the iPad

· Delete All Patient Results: delete all patient data.

Three colors are used on the Results screen to denote the response and trail characteristics:

· Pink: Incorrect response/”No Sound” choice

· Green: Correct response

· Black: a “No Sound” trial

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