'Life Above 20kh' Research Paper, Harmonics (Overtones)


I happened across this study about sound frequencies beyond 20kh. Harmonics (I prefer the term Overtones)

http://www.cco.caltech.edu/~boyk/spectra/spectra.htm

Aside from the study’s purpose, skimming the text is fascinating, sends my/your inquisitive mind in many directions.

Think about your listening room when reading his extremely detailed measurements to ascertain/eliminate any external contributions to his measurements.

Check out the amount of sound energy beyond 20kh of various instruments, crash cymbals particularly revealing. Jangling keys also a surprise.

The comments about a Piano’s Altered Harmonics including the strings/sound board/floor, I found surprising. I’ve always known how difficult it is to record a piano, this must be part of the challenge.

Even though test subjects say they cannot hear the super tweeter, experimenters could measure that the super-frequencies were detected by ..... , awareness and the brain’s perception ability are different things
..................................

Overtones. ’Analog Gets the Overtones Rght’.

I’ve often said, after a whole lotta years, the only way I can begin to explain why I prefer analog, is ’Analog Gets the Overtones Rght’.

Reel to Reel, my noisiest format, is my most preferred source. LP favored over CD. Tubes over SS. Myself, and ANY/EVERYBODY listening here to comparisons over the years has the same preferences.

More reason to get our ears professionally cleaned!!

Elliott




elliottbnewcombjr

Showing 1 response by teo_audio

between two ears alone, on the exact same pulsed signal, the ears, as a pair, have a discernment level that goes well beyond 100khz, with regard to timing resolution, in stereoscopic placement of a ghost stereo signal. (it’s all reproduction and fakery)

and, in that, it must occur at the exact correct microsecond and at the exact correct level, with respect to the two signals coming out of the speaker pair.

to do so, requires an approximate 250khz plus sampling rate, and zero jitter of any kind. at a signal bit depth of at least 20 bits.

currently, we are incapable of recreating/building this. (Jitter)

never mind the sound of an orchestra in the same set-up.

there is additionally other fundamental problems with digital and BJT and Fet transistors.

V-Fet and SIT transistors are the only ones that are useful for human hearing discernment, when it comes to peak functions, and then there is tubes, which are also correct in the critical to human areas of signal reproduction. Analog tape and LP are also correct. Doug sax’s mastering system, BTW, was all tube. For this reason.

when digital was conceived and brought into the world, none of this was known or considered. Digital did some of the most critical (to human hearing) things wrong.... as it was, for the most part.. engineered--- not heard. Big mistake.