Quote:
Originally Posted by EvilDragon
Filters ALWAYS influence the phase (unless they're linear phase, but then they have their own set of cons)! Not just the frequency.
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After reading up on the science, I get this:
You can create a filter by mixing a phase shifted copy of a signal with the original signal. The resulting signal will be also be phase shifted from the original. Therefore for a signal filtered by any means will result in a signal which is phase shifted from the original.
Which I guess is the same sort of principle as:
A fundamental frequency plus a harmonic series will result is a sawtooth waveform and therefore a sawtooth waveform produced by ant means will have a fundamental frequency and a series of harmonics.