----- Original Message ----- From: Sarah Fox <sarah@gendernet.org> To: Pianotech <pianotech@ptg.org> Sent: Tuesday, December 03, 2002 4:50 PM Subject: Re: audible resultant from two supersonic frequencies? > I don't doubt the creation > of a 500 Hz signal, but I'm not sure really what is going on with this > experiment. What did you think of the sound? > > Playing two notes very loudly on the piano is probably a better test, since > nonlinearities are known in string behavior and since it is quite possible > for movement induced by one string to modulate the vibratory behavior of an > adjacent string -- probably with both frequency- and amplitude-modulation > components. Very messy! Yes there is stuff happening that will take another 1,000 years to comprehend as far as the human mind is concerned. Meanwhile I am amazed at how good pianos sound especially right after they are tuned. ---rm Adding to the messiness are the unisons, whose > phasing and pitch (realistically) are variable. The experiment might be > aided by muting two of the three unisons on each note. Of course that > decreases the RMS amplitude by almost 5 dB. > > Peace, > Sarah > > _______________________________________________ > pianotech list info: https://www.moypiano.com/resources/#archives
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