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TWiRT 151 - CALM with Tim Carroll

On December 13th, 2012, the rules of CALM went into effect, and the FCC began enforcing them. In its simplest terms, this means over-the-air (OTA) broadcasters, cable operators, satellite television providers, and multichannel video program distributors must ensure that commercials have the same average loudness as the programs they accompany.

More specifically, it means applying the ATSC A/85 Recommended Practice – a set of methods to measure and control the loudness of digital audio – to commercial advertisements delivered to viewers.

Tim Carroll, President of Linear Acoustic, discusses some history of film and television program loudness, then brings us to a better understanding of loudness management. One goal is to keep TV viewers happy, and not give them any reason to complain about jarring volume changes.

Here’s an FAQ about the CALM Act.

Chris Tobin, and Kirk Harnack are your hosts.

This Week In Radio Tech is sponsored by:

Telos and the ProSTREAM audio streaming encoder with built-in Omnia audio processing. Visit


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TWiRT 151 - CALM with Tim Carroll

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