The usage of a commercial 24-GHz frequency-modulated continuous-wave radar sensor to retrieve sound signals is investigated in this letter. Thanks to the great phase measurement capabilities of current radar sensors, low-frequency audio signals can be recovered by measuring the vibrations they induce in objects due to their pressure wave nature. To prove the concept, a sound emitted by a speaker is recorded by analyzing the small-scale displacement of a reflective surface using a radar sensor originally devised for automotive and unmanned aerial vehicle (UAV) applications at the 24-GHz industrial, scientific, and medical band.
|Journal||IEEE Sensors Letters|
|Publication status||Published - Jun 2020|