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Voice-cancelling earphones or headphones

Many brands compete with noise-cancelling technology, but all offerings seem tuned to mitigate frequencies other than voices.  I appreciate that on an airplane or gun range, but in an open office plan, the only common attempt at mitigating vocal pollution is to add white noise variants.  White noise systems have limited effectiveness and alleged health drawbacks.  My noise cancelling headphones cut the white noise, effectively enhancing voices that I want to shut out.  I can use "sound-isolation" instead of "noise-cancellation" but they are bulky and hot.  I'd think it would be possible to use noise-cancellation technology to target vocal frequencies.  Thoughts?