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Flanging
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{{Short description|Audio effect}} {{Redirect|Flanger|the musical project|Flanger (band)|the railway vehicle|Flanger (railroad)}} {{listen |filename=Flanging effect.ogg |title=Example of flanging |description=A short sample followed by two flanging versions }} '''Flanging''' {{IPAc-en||'|f|l|ae|n|dZ|I|N}} is an [[audio signal processing|audio effect]] produced by mixing two identical [[audio signal|signals]] together, one signal delayed by a small and (usually) gradually changing period, usually smaller than 20 [[millisecond]]s. This produces a swept [[comb filter]] effect: peaks and notches are produced in the resulting [[frequency spectrum]], related to each other in a linear [[harmonic series (music)|harmonic series]]. Varying the time delay causes these to sweep up and down the frequency spectrum. A '''flanger''' is an [[effects unit]] that creates this effect. Part of the output signal is usually fed back to the input (a re-circulating [[Delay (audio effect)|delay line]]), producing a resonance effect that further enhances the intensity of the peaks and troughs. The phase of the fed-back signal is sometimes inverted, producing another variation on the flanger sound.
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