The Mute Charge is a piece of equipment in Call of Duty: Advanced Warfare. It is first used in "Atlas" when the player must place one before breaching the room with the President. While never fully explained, it would appear the mute charge generates a vibration-dampening field around itself when activated, allowing the use of explosives and guns during stealth missions. Within this field, gunfire sounds like a whisper, and even the tremors of a breaching charge being used on a building are diminished so much as to go unnoticed by people in the adjacent room.
This type of equipment is only used in a few campaign missions, and is not available in any other game modes.