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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: RE: Most likely posted by rick_m on September 21, 2011 at 20:33:40:
I'm a retired mechanical engineer. One of my areas of expertise was vibration analysis and balancing of rotating equipment. Yes, if you want to nit pick, nature does not behave in a totally simplified theoretical manner. That is because we are not accounting for every little minor factor like air resistance, material imperfections, magnetic field, Coriolis force, the location of the moon, ...
But, I found early in my career that the only way you can deal with the real world is to break it down into the simplest forms and deal individually with all the ones that are significant. And, there is theory to deal with virtually as much as you can comprehend. And when the human mind starts to get taxed then finite element computer programs can take over all the little elements to model the composite one.
But back to the subject at hand. Once you let go of the guitar string, you lose total control of the motion unless you touch it again. It is well described by force equals mass time acceleration. The specifics are that mass stays constant, but force does not. Just like a spring, it starts out high, reduces to zero, and then goes high again. And yes there is damping, so amplitude will reduce with time, and I still say frequency does not significantly change. And it is essentially a sine wave that is produced. Of course there will be harmonics as the string will almost never vibrate in the fundamental mode only. But it will be dominant. The guitar itself will vibrate if it is acoustic and add more harmonics. That is what gives the distinctive sound, and makes a guitar a guitar.
But in all of this there is no such thing as impact. The guitar sting cannot instantly accelerate to a high velocity and ignore that the sting has mass. It will in fact accelerate almost exactly the same as any other string that is the same length, under the same tension, and with the same weight. And with a little tuning it will be exactly the same. And science will almost perfectly predict what that sine wave frequency will be.
And because it behaves this predictably it is easy to calculate the speed you need to replicate the string movement, sound wave movement, and voltage rise in an amp. And that is all it comes down to in the end, voltage at a point in time. There is only one. Amps do not produce multiple frequencies at the same time. They only generate one (per channel). This is what makes digital possible. You are just measuring voltage level at successive points in time. There is a real limit to how fast the sine wave can be generated, and as always a real limit to how fast it can change and the ear still detect the change. The drum, bone linkage just runs out of bandwidth.
Sorry for the rant, but I think science well defines the generation and reproduction of sound. There are no fifth and sixth dimensions that need to be invented to describe sound. Amplitude and frequency is all there is.
Ron
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Follow Ups
- RE: Most likely - Ron AKA 21:57:37 09/21/11 (1)
- RE: Most likely - rick_m 20:54:51 09/22/11 (0)
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