<P> Loudness normalization is a specific type of audio normalization that equalizes perceived level such that, for instance, commercials do not sound louder than television programs . Loudness normalization schemes exist for a number of audio applications . </P> <Ul> <Li> Commercial Advertisement Loudness Mitigation Act </Li> <Li> European Broadcasting Union R128 </Li> </Ul> <Li> Commercial Advertisement Loudness Mitigation Act </Li> <Li> European Broadcasting Union R128 </Li>

A graph showing the loudness and frequencies of sounds