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I have heard that there is a technology that modulates ultrasonic waves into audible sound through multiple paths and sends them out. The reason for using this technology to send the voice as much as possible in a specific direction is because ultrasonic waves have sharp directivity and straight-line properties. However, as the frequency increases, the attenuation in the air is severe, and I do not understand how it can be transmitted farther. Also, it is said that it is self-demodulating without a demodulation signal, but how do you know the demodulation distance? I would like to ask those who have data or experience related to it.

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    $\begingroup$ Do you have a reference to put this question in better context? The human ear is nonlinear and could potentially demodulate some information on a high-level ultrasonic carrier $\endgroup$
    – Roger Wood
    Commented Jan 29, 2022 at 2:56
  • $\begingroup$ Of course, but it is not said to be formal. Sorry not to accept your demand.. $\endgroup$
    – Tiny
    Commented Jan 29, 2022 at 10:22

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