This has proven quite effective in small, controlled environments where there are few frequencies to “mirror” (such as wearing noise-canceling headphones on an airplane), but it’s not practical for open office areas in part because the processors necessary to analyze and mask so many frequencies would be prohibitively expensive. With soundĬancellation the sound wave is picked up by a microphone, analyzed by a microprocessor, and then a speaker placed in the path of the sound wave broadcasts a mirror image (exact opposite) frequency, thus flattening out the wave and canceling out much or all of the sound.
Sound cancellation – or “active noise control” – electronically alters an incoming sound wave to minimize or eliminate it altogether. Unfortunately, it never really worked – with comical results! In the TV series, whenever someone was speaking in “the cone of silence,” the theory was that no one outside the cone could hear it very well. When we speak to customers, they often think of sound masking as if it were something like the “Cone of Silence” in the old Get Smart TV series.
They are not the same thing, though this is a common mistake. Sound masking (or “white noise”) is often confused with sound cancellation.
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