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What is Phase Cancellation

Phase Cancellation

Phase cancellation is a form of destructive interference.

In digital audio, phase cancellation occurs when two waveforms are combined and at a given point, one of the waveforms is in the positive and the other is in the negative. The resulting combined waveform will be, at that particular point, at a lower amplitude than either of the original two samples. If the amplitude of the two samples is identical the amplitude will be at zero - producing silence.

The effect can be useful in removing unwanted elements from a recording, for instance in reducing noise or in converting a full recording into an acapella.

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