A prevent uttering long and high -pitched sounds structure and NOISE -CANCELLING HEADPHONES for reaction type NOISE -CANCELLING HEADPHONES

The utility model relates to a reaction type NOISE -CANCELLING HEADPHONES especially relates to the structure of uttering long and high -pitched sounds of preventing that is used for reaction type NOISE -CANCELLING HEADPHONES. A prevent the structure of uttering long and high -pitched sounds, including the earlap for reaction type NOISE -CANCELLING HEADPHONES be equipped with vocal drive module inthe earlap, the sound production drive module include dirver circuit board, with the vocal subassembly that the dirver circuit board electricity is connected, still be equipped with in the earlap with that sound production drive module electricity is connected and be used for picking up environment sound pickup unit, still be equipped with in the earlap and be used for filtering the sound production subassembly with the baffle that sound was propagated between the pickup unit. Through increasing a baffle, suitably separation sound production drive module be loudspeaker to pickup unit be the sound transmission between