The details are explained in the GitHub wiki.
An almost consumer hardware based mobile prototype of a hearing aid with open source software
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The details are explained in the GitHub wiki.
Today I added a few script to measure and evaluate some basic properties of the setup: Feedback and amplification.
Feedback can be measured by playing back white noise and recording which part of it is recorded by the microphones.
The instructions are detailed in the GitHub Wiki
The impulse responses are shown in the upper panel, the frequency responses in the lower panel.
You can see that there is substantial feedback and that is far worse on one side (which probably indicates headphone-lottery).
Amplification in terms of output level vs. input level can be measured similarly, by feeding signals with determined level and frequency (e.g., sine sweeps) into the signal processing block and recording the corresponding output signals.
The instructions are detailed in the GitHub Wiki
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