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Ultrasonic hearing

Since this issue was mentioned recently on these pages, the literature cited (Kaoru and Shogo (AES-paper 5401), Griesinger) does not indicate that humans can hear frequencies above 22 kHz.

Griesinger further mentions that, in addition to the fact that the human hearing mechanism works as mechanical low-pass filter, a speaker driver emitting that kind of frequencies would beam that much that the "sweet spot" for those frequiencies would be very small :"Even assuming ultrasonics are audible, loudspeaker directivity creates an unusually tiny sweet spot, both horizontally and vertically." As a consequence, "To actually hear ultrasonics the listener must be very carefully aligned with the driver, both horizontally and vertically".


AES 5401 is from 2001, Griesinger's comments from 2003, has there been any publication in the meantime which sheds new light on the subject of ultrasonic hearing?


Klaus

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Topic - Ultrasonic hearing - KlausR. 08:27:06 06/15/05 (34)
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