Extraneous disturbances in the learning environment that may interrupt or interfere with communication.
Sound of any sort, including that which is loud, harsh, confused, or senseless.
An unwanted electrical interference that obscures useful visual information on the television monitor or image intensifier is referred to as an undesirable electric disturbance.
Any noise, especially those that are chaotic and uneven, which is undesired or disrupts the capacity to perceive sounds clearly.