"Phil Allison" wrote in message
...

"Ben Bradley"

I suspect Bob knows it as well as you do, but he's just missing it
and has some other idea in mind when it comes to a speaker cone.



** We are all the victims of a pathetic NG troll's wet dream and a
hoax.

I think you have anger issues.

Bob Cain has no interest in the facts - he is having a giant hoot at
our
expense.

Hardly. Bob is a good guy searching for an answer he can't determine
himself. He cannot prove a negative, so absent a mathematical proof
otherwise, he is free to deny its existence. We can all perform mind
experiments, but that always doesn't mean they are right. It took a few
thousand years for someone to disprove the intuitive mind experiment that if
a car is traveling at 0.99c and turns on its headlights, the light is now
traveling 1.99c (Note: I know they didn't have cars 2,000 years ago). I'm
not saying Bob is Einstein, but Einstein at least proved his point with
mathematics that have held up to testing.

Bob can correct me here, but from where I sit, Bob does not deny the Doppler
shift. He completely accepts the formula fo = fs . (v - vo) / (v - vs). What
he does not accept is that you can insert the speaker diaphragm's movement
as vs. He accepts that you can put the speaker on the train and predict the
Doppler shift with the above formula as does everyone he's arguing with.

But here's the kicker: Either the above formula is wrong, there is no
Doppler Distortion, or somebody left out an assumption somewhere. Why?
Because the formula does not take into consideration the movement of the
diaphragm. If the source and observer are not moving, there is no Doppler
shift, right? But according to the proponents of Doppler Distortion, there
*is* a shift. Everything that creates sound moves in some way. So why hasn't
someone updated that formula?

The Doppler formula ignores the movement of the source AS IT CREATES THE
WAVES. So, if the source were some huge vibrating wire that moved a couple
of feet as it created the wave, the above formula would not account for the
wire moving.

So, Bob's position is quite simple: Show a formula that will predict what
the Doppler shift will be based on the movement of the source itself when
creating the wave, then perform an experiment that shows those results. I'm
thinking he'd settle for the former.

So, it's easy to find the formula that shows how Doppler works (train
example) without taking into consideration the movement of the plane of the
source that is creating the sound. I've seen numerous sites talk about
Doppler Distortion, but I've yet to uncover one that shows the actual
mathematical representation.

Somebody post this formula so we can all go to bed.


Only complete fools keep going when they are being conned.

Like I said...