I have Schizophrenia and would like to know if sound I hear is real or just normal background sound using a app. Thanks
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This is the Spectrum mode of this app https://f-droid.org/en/packages/org.billthefarmer.scope/
Im hissing in this picture (peak around 7kHz) and there is a loud AC unit going which is all the low frequency humming on the left.

Thank you very much app and extra info. It is great that it is f-droid :)
Glad to help. Always good to have an open source option :)


