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The hypersonic effect is a phenomenon ... other studies have contradicted the portion of the results relating to the subjective reaction to high-frequency audio, ...
Sound from ultrasound is the name given here to the generation of audible sound from modulated ultrasound without using an active receiver. This happens when the modulated ultrasound passes through a nonlinear medium which acts, intentionally or unintentionally, as a demodulator .
Simulation of hypersonic speed (Mach 5) While the definition of hypersonic flow can be quite vague and is generally debatable (especially because of the absence of discontinuity between supersonic and hypersonic flows), a hypersonic flow may be characterized by certain physical phenomena that can no longer be analytically discounted as in supersonic flow.
Ultrasonic hearing is a recognised auditory effect which allows humans to perceive sounds of a much higher frequency than would ordinarily be audible using the inner ear, usually by stimulation of the base of the cochlea through bone conduction. Normal human hearing is recognised as having an upper bound of 15–28 kHz, [1] depending on the person.
Hypersonic sound, a method for creating audible sound from ultrasound; Hypersonic effect, a psychological effect induced by ultrasound; HyperSonic Sound, a trade name for a device that produces modulated ultrasound that can make its carried signal audible without needing a receiver set
At hypersonic speeds, this effect becomes much more pronounced, due to the exponential reliance on the Mach number. Since the boundary layer becomes so large, it interacts more viscously with the surrounding flow. The overall effect of this interaction is to create a much higher skin friction than normal, causing greater surface heat flow.
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The Hypersonic effect apparently originates with a single research group whose results contain some contradictions and whose results have apparently never been independently reproduced. On the other hand, there is ample reproducible research indicating that ultrasonics are inaudible to humans.