I got a report from a customer of my audio analysis app saying that the frequency spectrum graph we show has a mirror image of peaks about 4000 Hz (the Nyquist frequency for 8000 samples per second). Our app requests 22050 samples per second, and is getting 22050 samples per second. But apparently the system is up-sampling the microphone audio to be able to deliver what we ask for. The fact that the original sampling was done at 8000 Hz is not "fixed" by up-sampling. I saw this same thing in the very early days of Android on some cheap devices. But I didn't think anybody was still doing this sort of thing today. The LG G3 is not that old. Can anyone else confirm this behavior on the LG G3? Or have you seen such things recently?
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