FYI: There's Life Above 20 Kilohertz!
There's life above 20 kilohertz! A survey of musical instrument spectra to 102.4 kHz
There's life above 20 kilohertz! A survey of musical instrument spectra to 102.4 kHz
FYI: There's Life Above 20 Kilohertz!
There's life above 20 kilohertz! A survey of musical instrument spectra to 102.4 kHz
I get uncomfortable with any frequency above 12kHz.
It pierces my ears, even though not being really audible.
So I prefer systems that cannot reproduce higher frequencies.
I get uncomfortable with any frequency above 12kHz.
It pierces my ears, even though not being really audible.
So I prefer systems that cannot reproduce higher frequencies.
hmm can I have something to drive away the stray dogs? They are very aggressive and day before yesterday when I went for a morning walk, they almost attacked me.
I get uncomfortable with any frequency above 12kHz.
It pierces my ears, even though not being really audible.
So I prefer systems that cannot reproduce higher frequencies.
manoj.p
Do one thing. Get a sine test pattern at or above 20khz and play it. Tell us if you can hear it and then we can discuss.
It's hardly surprising that instruments produce such sounds (or "energies"). Nobody told the designers about the range of human hearing. Nobody told the birds to watch out what they sing, and not to go too high. Nobody mentioned to the bats that we might even be interested in the noises they make.As a doctor I can comment that the instrument may go to higher frequencies but the human auditory system cannot perceive beyond 20 kHz...
Perhaps even hifi manufacturers are going to have a problem with a marketing line that goes, "Look at these brainwaves: You may not hear the difference, but your brain can!"X. Significance of the results
Given the existence of musical-instrument energy above 20 kilohertz, it is natural to ask whether the energy matters to human perception or music recording. The common view is that energy above 20 kHz does not matter, but AES preprint 3207 by Oohashi et al. claims that reproduced sound above 26 kHz "induces activation of alpha-EEG (electroencephalogram) rhythms that persist in the absence of high frequency stimulation, and can affect perception of sound quality." [4]
Oohashi and his colleagues recorded gamelan to a bandwidth of 60 kHz, and played back the recording to listeners through a speaker system with an extra tweeter for the range above 26 kHz. This tweeter was driven by its own amplifier, and the 26 kHz electronic crossover before the amplifier used steep filters. The experimenters found that the listeners' EEGs and their subjective ratings of the sound quality were affected by whether this "ultra-tweeter" was on or off, even though the listeners explicitly denied that the reproduced sound was affected by the ultra-tweeter, and also denied, when presented with the ultrasonics alone, that any sound at all was being played.
From the fact that changes in subjects' EEGs "persist in the absence of high frequency stimulation," Oohashi and his colleagues infer that in audio comparisons, a substantial silent period is required between successive samples to avoid the second evaluation's being corrupted by "hangover" of reaction to the first.
hmm can I have something to drive away the stray dogs? They are very aggressive and day before yesterday when I went for a morning walk, they almost attacked me.
I want to add here that even if there may be an effect on brain waves that does not qualify as hearing. It may be called feeling. Similar, but more prominent, is the effect of subsonic sounds 1 to 20 hertz which one can't hear but you feel the thump. Imaging the effect of a lions roar.
hmm can I have something to drive away the stray dogs? They are very aggressive and day before yesterday when I went for a morning walk, they almost attacked me.
FYI Definition / FYI Means
The definition of FYI is "For Your Information"
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FYI: There's Life Above 20 Kilohertz!
There's life above 20 kilohertz! A survey of musical instrument spectra to 102.4 kHz