09-20-2021, 02:24 PM
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
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