This can be a few CMOS chips or a small microcontroller. If you want to make white noise (which can be shaped into pink noise with a filter), the usual method is with a pseudo-random number generator. Keep in mind that the document I lifted this from is intended to promote their products, but I think the principle is sound (no pun intended). Such a vendor is at best naïve, and more likely a borderline charlatan. Than another because it uses “pink” noise rather than “white” noise, run the other way, don’t walk. Should a vendor attempt to convince you that his system is better Cambridge Sound Management makes their opinion fairly clear:īoth white noise and pink noise are anything but unobtrusive, and neither is veryĮffective at blocking speech. White noise is more unpleasant than pink noise but neither apparently work all that well. Seems like the optimum spectrum for masking speech yet not sounding too unpleasant is a 'haystack' spectrum that mimics speech.
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