Virtual Microphones: Optimum Real-Time Demodulation of Phase Modulated Ultrasound

Ritter T, Merkel T, Lühmann HG. Virtual Microphones: Optimum Real-Time Demodulation of Phase Modulated Ultrasound. In: AES Convention 132. Audio Engineering Society; 2012.pp. 43:1-4. Available from: https://aes.org/publications/elibrary-page/?id=16598

@inproceedings{Ritter2012_16598,
  author = {Ritter, Tom and Merkel, Tobias and Lühmann, Hans-G.},
  title = {{Virtual Microphones: Optimum Real-Time Demodulation of Phase Modulated Ultrasound}},
  booktitle = {AES Convention 132},
  pages = {43:1-4},
  url = {https://aes.org/publications/elibrary-page/?id=16598},
  year = {2012},
  month = apr,
  publisher = {Audio Engineering Society}
}

TY  - CPAPER
TI  - Virtual Microphones: Optimum Real-Time Demodulation of Phase Modulated Ultrasound
AU  - Ritter, Tom
AU  - Merkel, Tobias
AU  - Lühmann, Hans-G.
T2  - AES Convention 132
SP  - 1
EP  - 4
M1  - Paper 43
PY  - 2012
DA  - 2012/04/06
UR  - https://aes.org/publications/elibrary-page/?id=16598
PB  - Audio Engineering Society
LA  - en
AB  - The project “Virtual Microphones” aims to replace conventional audio microphones by a system consisting of ultrasonic sensors. The fundamental physical principle utilized is that ultrasonic waves are phase-modulated when superimposed by audio waves. Due to the physical relationships the phase changes of the ultrasonic carrier are very small. The precise demodulation of the audio signal was in the focus of the investigation among other measures, like providing a very stable carrier frequency or the focusing of the ultrasound beam on the receivers. Several methods of demodulation for phase-modulated signals are compared. The comparatively low resulting signal-to-noise ratio after the demodulation required further signal processing in form of noise reduction to be investigated and its performance accessed.
ER  -