Does apple release calibration values for microphones for all its devices

I would like to find out if Apple releases calibration values for microphones on all its devices? Im creating an app that indicates ambient noise levels but not knowing the calibration values of the microphone would mean I would need to buy each phone model and perform calibration to get general offsets. It would be near impossible to get a standard user to calibrate their own phones based on a calibration protocol. Users would just delete the app..

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To those that are interested. They don't exactly publish all the microphone calibration values. However, in ResearchKit which is open source, they do release sensitivity values for iphones, ipod, and ipad. And they do have the equalisation value for the microphones in the code which does to a certain extent eliminate the need for individual microphone calibration offsets

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Developers who do this tend to collect (or have test users or consultants who have) a large number of iOS device models, old and new, with which to test and gather calibration data.

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hotpaw2
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To those that are interested. They don't exactly publish all the microphone calibration values. However, in ResearchKit which is open source, they do release sensitivity values for iphones, ipod, and ipad. And they do have the equalisation value for the microphones in the code which does to a certain extent eliminate the need for individual microphone calibration offsets

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Alexanderhearx
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