The law authorizing this new authority for the FCC is referred to as the CALM Act, which stands for the Commercial Advertisement Loudness Mitigation Act. The act requires TV broadcasters to make sure that the volume levels of TV commercials are no louder than regular TV content that they are associated with.
After two years of finalizing the details of the regulations associated with the law, the FCC began its CALM Act enforcement role on December 13, 2012.
For more details on how the provisions of the CALM Act will be enforced, and how you, as a TV viewer, can file your own complaints, read the following articles by Robert Longley, About.com Guide for U.S. Government Info:
Also, for additional perspective, including my own commentary about the purpose and need for the CALM Act, read my previous articles:
Do you have an opinion on this new law? If so, feel free to comment below or in the Forum!