The House of Representatives has passed the Commercial Advertising Loudness Mitigation (CALM) Act, the legislation that mandates normalizing the volume differences between TV shows and commercials.

The Senate previously passed its own version of the Act. The two versions don't differ tremendously, but still need to be reconciled before being sent to President Barack Obama, who is expected to sign the bill.

An explanation of the major provisions of the legislation, along with some of the technical details of implementing loudness control, are available in the CED webinar "Everyone Stay Calm: Preventing excessive loudness variation between channels and programs."