Re: speaker feedback?

Arny Krueger wrote

... A piezo sensor is probably an acellerometer. A
sensing coil produces velocity feedback. Either can be
turned into positional feedback with appropriate
circuitry (one or two stages of electronic mathematical
integration). ...

Why won't a simple inversion suffice?

Never studied calculus or classical physics I take it.

This might get you started:

http://www.fearofphysics.com/Xva/xva.html

This is the more technical version:

http://www.ugrad.math.ubc.ca/coursedoc/math101/notes/applications/velocity.html

What's classical physics?

Something that would really help you Ian, if you could even grasp
the need and application.

It explains why electrical integration is the right answer to the
problem at hand, and why simple inversion isn't.

I don't think much of those pages.

The real world is not a popularity contest.

If you don't like the alternatives I picked, then google up
something that fits you more.

I suspect there is a
key difference between exhibiting knowledge, and
teaching.

Not just a suspicion, the difference between exhibiting knowlege and
teaching is a widely-recognized fact.

However, some people are unteachable.

Do you have a link that starts off by
explaining what calculus is, written by someone who can
teach by writing?

First show me someone who can learn by reading.

Anyway, I asked because they said at school that if I
integrated a sine I would get a cosine. Then they said
that if I integrated the cosine I would get an inverted
sine. Years later, someone told me that music is made of
a sum of sines, and I took the liberty of thinking that a
series of sums could be integrated term by term.

So what's the problem with that?

Thanks Ian for the quick example of difference between exhibiting
knowlege which is what you just did, and knowing how to apply it in
the real world which is what is needed here.

I take it you don't know the answer to my question. Thanks anyway.

cheers, Ian


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