Phaser (effect)

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A phaser or phase shifter is an electronic sound processor used to filter a signal by creating a series of peaks and troughs in the frequency spectrum. The position of the peaks and troughs of the waveform being affected is typically modulated by an internal low-frequency oscillator so that they vary over time, creating a sweeping effect. Phasers are often used to give a synthesized or electronic effect to natural sounds, such as human speech.

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