Got Spectroid installed since years but hadn't looked into the settings for probably as long. :) I tried with Audacity and generated a 50 Hz tone on a BT speaker. Spectroid picked it fine, also its harmonics. So at least I know the microphone in my phone is capable enough.
Thanks for the tip with the brown noise. I noticed today that other sounds seem to effectively mask the hum while watching a video. It would be "gone" when people were talking but immediately return when there was silence. To have to hear this for years? Enough to drive one crazy.
Did you ever find the source?
First for me it wasn't a continuous tone, but really low frequency stuff (say below 50 Hz), like vehicles in the distance, but continuous (people idling cars outside would drive me nuts). Never found any solution or source. I now think it's just resonance of the land/buildings. Maybe it was some kind of sensitivity to it. Maybe something physiological in my body actually generating that near my ears. Where I live now it's quiet. I can still hear vehicles a block away when they pull up and stop, or idle, but it doesn't drive me nuts anymore.
For the brown noise I use an old mp3 player with some noise tracks (used Audacity to generate an 8-hour track to convert to mp3).
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