^^ Unrelated, in case anyone was wondering.
Does seem like there's a lot of Tims (or Jims or, more generally, ?ims) and Williamses in electronics. But that could just be coincidence in my perception.
Tim
let w=1i*f/fc and filt=1./(1+w+w.*w+w.^3+w.^4+w.^5) [a fairly decent LPF] then, if the spectrum of a signal is sf outf=filt.*sf provides you with the spectrum of the output from the filter looks right etc can be converted backinto time waveform
new, let w=f/fc, with NO phase shifts and filt2=1./(1+w+w.*w+w.^3+w.^4+w.^5) [again, a fairly decent LPF]
and again, if the spectrum of a signal is sf out2f=filt2.*sf the signal 'looks' very similar, but there were no phase shifts like in a normal filter.
It's difficult to get the LPF cutoff, but a single pole with NO phase shift is fairly easy to get.
But,I have no idea how to relate this physical phenomenon with concepts of violating causality.
Does a PIN diode exhibit any of the frequency attenuation with no phase shifts?
Nice name.
The filter book is Electronic Filter Design Handbook by Williams and Taylor.
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