The idea with noise cancellation is to record the background noise, invert the noise signal to create “anti-noise,” and then add it to your output signal, which includes your music. Think of it as adding -1 to +1, and you end up with zero. Sound waves that are 180 degrees out of phase, or the inverse of one another, cancel out when summed together. We’ve already covered how noise cancelling headphones work, and in a nutshell, noise cancellation is based on the principle of phase cancellation.
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