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About JohnCockburn

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  • Birthday March 23

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  1. Thank you David. You really are too kind. To be honest I don't know what came over me. Some kind of weird episode of craziness.
  2. Don't worry. I'm sure I'll quite rightfully face some consequences.
  3. David. I owe you a humble apology. Looking back over the way this thread developed, I can see that at one point i got hold of the wrong end of the stick about what you were saying, and ended up talking nonsense. What you were saying was right. I was wrong. And I also realise that there is a way that Tartini tones arising from beats could appear in a Fourier transform. If the difference frequency periodicity excites another resonance, such as an open string. That would do it, I think. Cheers john
  4. Honestly, David. Go away and read a high school physics text book.
  5. I edited that comment so as not to appear rude. But I see you managed to grab it. I have enormous respect for you as a violin maker.
  6. No, a flat line has "zero amplitude". Doesn't matter where on the screen it is. That's just a DC-offset. Of course, amplitude without frequency is meaningless, because nothing is oscillating.
  7. Right. We really are in the "post truth" world now.
  8. David. This is just foolish. No-one was talking about a waveform without amplitude. But a waveform of constant amplitude. This really is weapons grade nonsense.
  9. Always fancied having a go at Buddhism. Might help make me a bit less lairy.
  10. Sound ...of.....man...banging...his.....head....against....brick .......wall...........
  11. Anyway, to get back to the discussion of “Are Tartini Tones just high frequency beats?" If we want to demonstrate the phenomenon of beats, we take a signal that’s a linear superposition of 2 sinusoidal waveforms of frequencies f1 and f2. ie: S = sin (2πf­1t) + sin (2πf­2t) We arrange things so that we can vary f1 and f2. When these frequencies get within a few Hz of each other, we can clearly hear “beats” ie periodic increases and decreases in the loudness of the signal, at a frequency of f2-f1. The important thing to realize is that these beats aren’t in a
  12. Doesn't matter. Apart from "displacement from equilibrium" which in general, isn't the definition of amplitude. Amplitude is the maximum displacement from equilibrium. So constant amplitude, ie with no modulation or fluctuation of the amplitude, for a sound wave, for example, means that the sound has constant intensity, or perceived loudness, if you will. Changing the amplitude changes the loudness. "Amplitude without modulation produces no sensation of sound, only something ranging between a weird feeling, and pain" No. Wrong.
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