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Editorial Team
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Asked: 2026-05-22T03:12:31+00:00

For a project of mine I need to detect when the user blows into

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For a project of mine I need to detect when the user blows into the mic. I’ve following this tutorial: http://www.mobileorchard.com/tutorial-detecting-when-a-user-blows-into-the-mic/ and this question: Detect blow in Mic and do something
But still I do not get the results I want. The blow is detected way too late, or sometimes not at all. When I tweak some results the blow is detected correctly, but then the blow is triggered too fast, ie. when you talk or make a clicking sound it is detected as a blow too.

Has anyone found a good way of detecting a blow? Thanks.

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1 Answer

  1. Editorial Team

    The AVAudioRecorder sound level API is not designed to give you reliable results in separating blowing sounds from other types of sounds received by the mic.

    I suggest using the Audio Queue or the Audio Unit RemoteIO API, measuring RMS signal energy, envelope duration, and then using the Accelerate FFT library to check the spectrum for broadband noise vs. peaks that would suggest voiced talking instead of blowing.

    e.g. a more reliable result will require a lot more work than 1 OS call.

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