Using Ultrasonic Sound to Collect Audio Waves in Air

Merkel T, Lühmann HG, Ritter T. Using Ultrasonic Sound to Collect Audio Waves in Air. J Audio Eng Soc. 2013;61(9):656-666. Available from: https://aes.org/publications/elibrary-page/?id=16934

@article{Merkel2013_16934,
  author = {Merkel, Tobias and Lühmann, Hans-G. and Ritter, Tom},
  title = {{Using Ultrasonic Sound to Collect Audio Waves in Air}},
  journal = {Journal of the Audio Engineering Society},
  volume = {61},
  number = {9},
  pages = {656--666},
  year = {2013},
  month = sep,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=16934}
}

TY  - JOUR
TI  - Using Ultrasonic Sound to Collect Audio Waves in Air
AU  - Merkel, Tobias
AU  - Lühmann, Hans-G.
AU  - Ritter, Tom
T2  - Journal of the Audio Engineering Society
J2  - J. Audio Eng. Soc.
VL  - 61
IS  - 9
SP  - 656
EP  - 666
PY  - 2013
DA  - 2013/09/06
UR  - https://aes.org/publications/elibrary-page/?id=16934
PB  - Audio Engineering Society
LA  - en
AB  - The nonlinear properties of air with ultrasonic sound allows for the creation of a “virtual microphone,” which is the analog of the ultrasonic narrow-beam loudspeaker. When an ultrasonic wave (pump wave) mixes with a baseband audio sound, sidebands are created around the ultrasonic carrier, and these can be demodulated at the receiver. A preliminary investigation showed that the following technical requirements must be achieved: (a) generation of an ultrasonic wave with small phase noise; (b) reception of the wave over a wide dynamic range to allow for real-time demodulation; (c) a composite dynamic of 120 dB within the region around the 40-kHz carrier in order to achieve a microphone comparable to conventional microphones.
ER  -