Fig 1.
(a) Front view: the Aupiometer consists of a touch screen integrated into a Raspberry Pi, with which is associated a mini-keyboard, a touch pen, and headphones. (b) Rear view: the headphones are connected to a USB DAC on the back of the apparatus. The Aupiometer programs are freely available online.
Fig 2.
Interfaces of the modules implemented on the Aupiometer.
(a) Standard and high-frequency PTA; (b) speech audiometry “Modified Rhyme Test” (MRT [16]); (c) speech audiometry “Digit Triplet Test” (DTT [17]); (d) hyperacusis questionnaire ([18]; note that the display is cut relative to the screen size, a side scroll bar allows to scroll through the rest of the questionnaire).
Table 1.
Calibration sound levels of the Aupiometer associated with Beyerdynamic DT-770 Pro 32 ohms headphones.
The calibration of an audiometer is usually carried out at 70 dB HL; the values listed in parentheses after the RETSPL values correspond to the measurements taken, averaged over the two headphones, with a digital amplification level fixed according to the last perceptual evaluation of this study. Audiometric level ranges range from 5 dB digital amplification to 100 dB plus 5 dB (see text). *The RETSPL levels of the frequencies 0.125, 14 and 16 kHz are measured at 100 dB before saturation without being able to reach 70 dB HL with the device used; the corresponding RETSPL values before the parentheses are estimated by adding the missing difference.
Fig 3.
Average audiograms obtained with the Aupiometer and the ELIOS on all 32 ears.
Error bars represent standard deviations.
Fig 4.
Bland-Altman analyses for the comparison of the Aupiometer with the ELIOS.
Each panel corresponds to a given frequency and represents the bias and the 90% limits of agreement between the measurements taken with the two audiometers. Each point represents one ear and each red bar represents an overlapping value. The title of each panel indicates the value of the bias ± one standard deviation.