ATSC Recommends Loudness Practices

Washington, DC (November 9, 2009)--The Advanced Television Systems Committee (ATSC) has approved a Recommended Practice that offers audio loudness guidelines for HD and SD content.
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Washington, DC (November 9, 2009)--The Advanced Television Systems Committee (ATSC) has approved a Recommended Practice that offers audio loudness guidelines for HD and SD content.

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The ATSC Recommended Practice: Techniques for Establishing and Maintaining Audio Loudness for Digital Television was approved by the ATSC membership on November 4, 2009. That same day, the ATSC hosted a seminar on the topic of Audio Loudness at the Wiley Rein Conference Center in Washington, DC.

The Recommended Practice (RP) provides guidance to broadcasters and creators of audio for high-definition (HD) or standard-definition (SD) television content, and also recommends production, distribution, and transmission practices needed to provide the highest quality audio soundtracks to the digital television audience. The document focuses on audio measurement, production and postproduction monitoring techniques, and methods to effectively control loudness for content delivery or exchange. Additionally, the RP recommends methods to effectively control program-to-interstitial loudness, discusses metadata systems and use, and describes modern dynamic range control. It also includes specific information on loudness management at the boundaries of programs and interstitial content.

"High quality multichannel sound is an important element of the digital television experience," said ATSC president Mark Richer. "The new Recommended Practice provides the industry with uniform operating strategies that will optimize the audience listening experience by eliminating large changes in sound levels."

The November 4 seminar included presentations focused on ATSC's work on audio loudness. The program discussed related legislative activities and key topics such as industry outreach, real-world applications in audio, loudness measurement, monitoring, program interchange, interstitial loudness, and metadata. The event was attended by members of the broadcasting, cable, and satellite industries; as well as equipment manufacturers and consulting engineers.

The IEEE Broadcast Technology Society, DaySequerra, Dolby, J,nger Audio, Linear Acoustic, National Association of Broadcasters (NAB), National Cable & Telecommunications Association (NCTA), RTW, and Wiley Rein sponsored the event.

Advanced Television Systems Committee
www.atsc.org