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In Reply to: RE: "Ordinary" magnet wire posted by Tony Lauck on October 29, 2010 at 10:56:19
Hi
I don’t know if it is the same work but I did some consulting for Gary Kendall at Northwestern U once, who was investigating “stereo hearing” and he commented that in the investigation he did, that some people were able to detect an inter-aural difference corresponding to one wl at 200KHz.
Now, in questioning, he explained that was a time difference one detected and NOT a reflection on the bandwidth of ones hearing.
It was his finding that with the equipment of the day (in the early 90’s) that a sampling rate of 200KHz was sufficient to capture what we could detect (by monitoring brain waves) if not consciously hear. Some of the hf things seem to involve a brain response but no conscious awareness of it, that is to say you register a sound physiologically but you don’t hear it per say. That is different than hearing loss where you don’t register the sound or hear it.
Fwiw, to reproduce a square wave well enough that it looks essentially perfect on an oscilloscope, the system needs a bandwidth that extends from about 1/10 to about 10X the fundamental F.
Best,
Tom
Follow Ups:
Actually, it was different work done by Kunchur that sparked the debate that I recall. While his experimental work may have been exemplary he got thoroughly roasted for his conclusion that the ability to hear a 6 microsecond delay proved that more than 20 kHz bandwidth was required.
When I last tried, I didn't hear a difference between a 7 kHz sine wave and a 7 kHz square wave that had been band limited to 22 kHz, but it wasn't a serious effort. I once could easily hear a 21,000 cps sine wave. but almost 50 years later it takes a good day to hear 15,000 Hz.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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