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One reason commercials may sound louder is a sound compression technique in which the difference between loud and soft sounds is compressed. The result is that while the peak sound levels of commercials and programs may not differ, the average levels of commercials are higher.

The title of the bill is the Commercial Advertisement Loudness Mitigation Act, or CALM Act.

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The bill is S. 2847.

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Online:

Congress: http://thomas.loc.gov