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the difference between phasing and flanging

PostPosted: Thu Apr 19, 2018 2:15 pm
by kentlion
If you delay a simple sine wave and superimpose it on the original waveform, when the phase of the two sine waves is close, the sound is reinforced in some places. But when the two are exactly 180 degrees out of phase and exactly equal in amplitude, this results in total cancellation. It's simple maths — add +5 to -5 and you're left with nothing.

With more complex waveforms, superimposing the same signal and delaying it slightly creates what is known as a 'comb' filter — the frequency response of the filter has various peaks and troughs of amplitude ('teeth') across the harmonic spectrum. Some frequencies are reinforced whilst others are cancelled due to phase differences across the frequency spectrum, and when the delay time is changed (typically with an LFO), the teeth move to create the characteristic 'swooshing' effect common to phasers and flangers. However, whilst essentially based on the same principles and producing a similar effect, the two effects are achieved differently.