A highly focussed ultrasound beam was sent through the room. At a distance of several meters the ultrasonic wave was received again with an ultrasonic microphone. The wave field of a common audio source was overlaid with the ultrasonic beam. It was found, that the phase shift of the received ultrasonic signal obtains the audio information of the overlaid field. So the ultrasonic beam itself acts as sound receiver, there is no technical device like membranes necessary at direct vicinity of sound reception. Because this kind of sound receiver is not visible or touchable we call it "Virtual Microphone".

Authors: Merkel, Tobias; Lühmann, Hans-G.; Ritter, Tom
Affiliations: Beuth Hochschule für Technik, Berlin, Germany; Lütronik Elektroakustik GmbH, Berlin, Germany(See document for exact affiliation information.)
AES Convention: 132 (April 2012) Paper Number: 8587
Publication Date: April 26, 2012
Subject: Emerging Audio Technologies

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