in the outer world it’s like wearing headphones in the car… and there’s a guy tooting you from behind…
Why bother with electronics? Researchers at BU made a 3D printed acoustic metamaterial that blocks 94 percent of sound (>10db) while preserving airflow, plus it’s completely passive.
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To be fair, what’s shown is not claimed to be a prototype. (The news report calls it a prototype.) The setup is to prove the concept. Next up is development and refinements.
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Would your middle name be… Ignatz? 
Why close down an avenue of research when no solution has yet come to market?
Besides, patent owners shouldn’t enjoy monopoly rents over problems-- just over their particular solutions.
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