TV viewing could soon sound a little calmer. The CALM Act, which limits the volume of TV commercials, goes into effect today. CALM stands for Commercial Advertisement Loudness Mitigation. The act is designed to prevent TV commercials from blaring at louder volumes than the program content they accompany, and it applies to broadcasters as well as cable and satellite operators. The FCC adopted the rule a year ago, but gave the industry a one-year grace period. Suspected violations can be reported by the public to the FCC on its website.