Two subjects for the price of one:
Crowd noise: Count me among the large number of referees who feel that crowd noise is just as much a part of the game conditions as the weather and that teams should be prepared to handle it. Indeed, the referee may force the issue himself by refusing to stop play. However, the rules committee continues to feel otherwise, so there are specific steps to deal with it.
Violation or penalty: The NCAA rules recognize two kinds of rules infractions: fouls and violations (2-9-1). A foul is an infraction for which some penalty is involved in every case except two. A violation, on the other hand, does not carry a penalty.
