Guy, K2AV wrote: > > If one wants to dig up the research... >
http://www.audioholics.com/education/acoustics-principles/human-hearing-amplitude-sensitivity-part-1 "Speaking now in terms of dB SPL, the minimum discernable changes by the human ear/brain mechanism I've seen in the research that I've reviewed ranged from about 0.5 dB to 3 dB, depending on a number of factors." Table 1 (see the referenced link above or below) In Table 1 we see a collection of studies spanning 60 years. It should be kept in mind that in each case the results were obtained under laboratory-ideal conditions. Even so, we see a range of values from .25 dB to 3 dB. The resultant range is owing to varying methodologies used by the researchers and, of course, the response of the human hearing apparatus to the applied acoustic signals. <SNIP> >From the third column of Table 1, we see the minimum detectable value, for the most part, hovers around 1 dB, +/- a fraction of a dB, and that attainable only with ideal (or at least as ideal as technology allowed for at the time the study was done) laboratory test conditions and test subjects. I tend to use .75 dB to 1 dB when considering minimums." http://www.audioholics.com/education/acoustics-principles/human-hearing-amplitude-sensitivity-part-1 73, Bill -- View this message in context: http://n2.nabble.com/150-watt-boots-for-160m-tp4151943p4170175.html Sent from the [K3] mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
