[LAD] Quick question on theory

[Arnold Krille]

Am Mittwoch, 20. August 2008 schrieb Jonathan Woithe:
> > just a quick question so I don't look as a complete retard in my paper
> > for a conference:
> > The delta-peak contains all frequencies phase-aligned while white noise
> > contains all frequencies with random phase, right?
> That is my understanding, yes.

I just wanted to make sure. :-)

> To flesh it out a bit more you could add that the phase alignment in the
> delta-peak case occurs at the point of the delta-peak (assuming cosine
> decomposition), but that almost goes without saying.

Or the delta-peak is exactly at the position defined by the phase alignment.

Anyway, thinking about this I realized that I have maybe found a good way to 
reduce the noise in my data-samples while still preserving the steep 
(delta-peak-like) rising slope that is the real information... Maybe I 
shouldn't just do lowpass filtering but dft -> suppress/reduce the amplitude 
of frequencies with random phase -> back dft.
Only drawback is that this is _far_ slower then 1st order butterworth 
lowpass...

Thanks for the help,

Arnold
-- 
visit http://www.arnoldarts.de/
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