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Inconsistency in loudness levels is one of the most pervasive problems in the broadcast industry. Powerful Dolby tools and technologies help you control broadcast loudness problems and ensure a better listening experience.
Metadata in broadcast formats such as Dolby® Digital Plus™ and Dolby Digital ensure that viewers get consistent audio levels and superior sound.
A technology for accurate dialogue measurement, Dialogue Intelligence™ adjusts volume levels so viewers can hear every word clearly.
Televisions, A/V receivers, and set-top boxes with Dolby Volume correct the differences in volume levels across content types and channels.
The commercial that blasts like an alarm clock; the scene in which you see the actors' lips move but you hear no dialogue; the channel that always seems louder than the others. If you watch TV regularly, you know these and similar frustrations well.
Volume inconsistencies are still with us, despite reports to the contrary. The problem has reached the point that governments and standards organizations around the world increasingly mandate loudness control. In the United States, for example, the Commercial Advertisement Loudness Mitigation (CALM) Act took full effect in 2012.
Regulations can help, but solving all of the problems related to broadcast loudness requires a comprehensive approach—an approach that Dolby embraces with tools and technologies for broadcasters and equipment manufacturers alike.
Loudness problems can arise during content creation and at many other points in the broadcast chain. These problems occur for many reasons:
Poor loudness control can have significant consequences, such as:
What makes the Dolby approach to broadcast loudness effective is that it addresses the full range of causes of volume inconsistency across the entire broadcast chain. Dolby metadata includes tools for broadcasters to control loudness levels and tailor the audio to the consumer's replay environment.
Measurement tools from Dolby and our partners support international standards that include:
And Dolby Volume, our volume-leveling solution for TVs, set-top boxes, and A/V receivers, delivers a uniquely consistent and satisfying entertainment experience.
Include Dolby technologies in your loudness measurement products at no cost.
Because unwanted loudness variations have no single cause, Dolby offers multiple solutions.
Control loudness problems with Dolby solutions designed specifically for broadcasters.
5.1; 3×2; 5.1+1+1; 6×1; 5.1+2; 8×1; 4×2; others selectable
29.97 fps (NTSC); 25 fps (PAL); 23.98, 24, 30 fps (requires Dolby E Tri-Level Sync Interface DP579)
20 Hz to 20 kHz, ±0.25 dB
<0.01% at 1 kHz; <0.02% at 20 Hz to 20 kHz
Encoding: fixed, one video frame; PCM delay channel: fixed, one video frame
Log in to the Dolby Customer portal for help with your customer or partner account.
Apply for a license to include Dolby technologies in your products.
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Controlling Broadcast Loudness with Dolby Solutions
Control broadcast loudness problems and ensure a better listening experience with Dolby solutions.
Ensure that audiences enjoy a quality, accurate audio experience.
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