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Doppler with free fall bluetooth speaker?
#5
Sine Wave A- 440 Hz Concert Pitch for Ten Hours - Test Tone
https://www.youtube.com/watch?v=xGXYFJmvIvk

Played it on a standard HP laptop.

And I was shaking an old Galaxy III phone with 120 bpm (used a metronome before measurement to get the right tempo) maybe half a meter from the laptop (direction was towards and from the laptop, with phone microphone facing laptop). It was quite silent in the room.

Best regards.

//Erik
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RE: Doppler with free fall bluetooth speaker? - by Erik Josefsson - 09-20-2021, 02:24 PM

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