| Polymath 2005-08-20, 8:21 am |
| A good question indeed!
And a question that the so-called experts and authors in this
field fail to answer time and time again.
The Diracian, or Unit Impulse is a very good mathematical tool
to analyse the response of systems once a mathmatical model of
those systems had been produced.
It is, however, a poor mathematical claim to make that such
impulses are found to be part of a system when neither the
area nor the magnitude of such impulses are found anywhere in such
systems.
To those who ask, "Who cares? I get good results." , I suggest that
their approach is unscientific and compares to the religious
loonies who sacrifice goats and virgins to stop the Sun falling
out of the sky and justify the continuing practice by the Sun
remaining in the sky.
So.....is the world of DSP a world of scientific men, or is
it a world of snake-oil charlatans and of religious loonies?
Where do these Diracian impulses come from?
Airy R.Bean wrote:
> 2. Talking of snake-oil, where have your Diracian impulses come from?
>
> The Diracian has some interesting properties - zero width,
> area of unity, infinite sum of all possible cosines, a height
> which is not discussed but which appears to be greater in magnitude
> than a Bristow-Johnson ego (if that were indeed possible). In the
> systems that you deal with, what experimental evidence do you
> have that there are pulses with the attributes of Diracians upon
> which to base your theory?
>
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