Microwave Microphone Using a General Purpose 24-GHz FMCW Radar
Eloi Guerrero, Josep Brugués, Jordi Verdú, Pedro de Paco
Abstract
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.
Topics & Concepts
AcousticsRadarMicrophoneComputer scienceContinuous-wave radarMicrowaveRadar engineering detailsRemote sensingSound pressureGeologyRadar imagingPhysicsTelecommunicationsFlow Measurement and AnalysisUltrasonics and Acoustic Wave PropagationSpeech and Audio Processing