Should actually be fairly simple to do, sound is just vibration/frequencies of moving air and anything pliable enough can easily be made to vibrate at a different frequency with an outside force.
Something as simple as a piezo-electric element at the right spot or spots in the mask coupled with with a sensor that wold switch it on when it detected the right movement/electricity precursors signifying speech/sound about to be made in the throat, if sound canceling is possible then sound frequency modification and modulation should be just as easy to achieve...
Cymantics make for some rather good illustration videos of how sound and even energy can effect matter and everything in the throat is just like most everything else in the body at least 50% water so......
Should actually be fairly simple to do, sound is just vibration/frequencies of moving air and anything pliable enough can easily be made to vibrate at a different frequency with an outside force.
Something as simple as a piezo-electric element at the right spot or spots in the mask coupled with with a sensor that wold switch it on when it detected the right movement/electricity precursors signifying speech/sound about to be made in the throat, if sound canceling is possible then sound frequency modification and modulation should be just as easy to achieve...
Cymantics make for some rather good illustration videos of how sound and even energy can effect matter and everything in the throat is just like most everything else in the body at least 50% water so......