To analyse people's subjective preferences, we asked a test panel of people with hearing loss to rate the sound quality of each of the three hearing aids in different real-life sound environments. The test subjects sat in a sound laboratory and listened to the recorded output of each hearing aid, using headphones.
Each person in the test panel used a computer interface that allowed them to switch between the different hearing aids at will, without having to restart the audio clip.
For each sound environment, they rated each hearing aid on a scale from 0 – 100. After listening to all of the hearing aids, they moved on to the next sound environment.
We used an adapted version of the well-established MUSHRA test paradigm (Multi Stimulus test with Hidden Reference and Anchor) for people with hearing loss in this study.3