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Talk to others and yourself without disturbing others or being overheard
This device would consist of a fully-covering mouthpiece, some headphones and a few I/O jacks for various devices. The mouthpiece prevents sounds of a certain volume or lower from emanating, perhaps through the use of destructive interference (ITPUET?). However, the vocal sounds can still be transmitted
into headphones, cellphones, recorders or radios. The practical upshot is that you can speak in normal tones and only you and the gadgets hooked into the device will hear your voice. This will spare others from your meaningless jabber and save you some of the embarrassment of, say, practicing singing or a foreign language in public.
This device will feature an emergency override which allows shouted sounds to take on their proper volume and an "unmute" button for quieter conversation.
||I'm glad this was not about muting someone else. I would use it to dictate things to myself when the spirit moves me so I could type them up later.
||...the visual on this idea is hilarious...