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On Oct 9, 2020, at 2:35 AM, bernard cleyet <firstname.lastname@example.org> wrote:
A friend reminded me of a demo. at the Naval Postgrad. School, wherein an ultrasonic speaker generated wave is voice modulated in order to produce a rather narrow bean Tannoy. I presume it works by the ear’s being non-linear in amplitude response. Any idea if it would work W/a hearing aid that has no gain above about 8k Hz?
bc whose hearing is about 60 dB down.
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