Already have the perfect concept in my head but I'm having a tough time finding imgs lol

[@Caasicam]
Would a gadget based on destructive interference (same thing used in noise cancellation headphones, but more potent and effective) be possible? Something like... Either a personal equipment that would make the operator and everything in a small area around it completely silent (within acceptable limits ofc.)? Or even a deployable to mask or even eliminate the sound of breaching charges for example?