Phase reversal

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The phase reversal of a periodic process means the sign reversal of the instantaneous values ​​of a variable . This is implemented electronically using an inverting amplifier or mechanically by changing the two connections, which is referred to as polarity reversal .

Phase reversal is used in audio engineering to correct the phase of an incorrectly polarized audio signal, or to intentionally reverse a correctly polarized but undesirable signal. If this reverse signal is mixed with the original signal, both can cancel each other out. Depending on the completeness, the sound becomes quieter or mutes completely.

Reverse polarity does not mean phase shift

In the case of a symmetrical, for example sinusoidal, alternating signal, the polarity reversal appears like a shift in the phase angle by 180 ° of the fundamental oscillation. Such a relationship does not apply to any other signal curve, see phase shift .