Dolby Volume Header

Dolby® Volume eliminates volume fluctuations in TV programming while delivering a superior listening experience at any volume, even for content that may not have been processed at the source.

Dolby’s loudness control mechanisms are an integral part of the metadata architecture found in Dolby E, Dolby Digital, and Dolby Digital Plus.

Professional loudness tools from a variety of partner manufacturers and from Dolby enable the broadcast chain to follow legislation mandating uniform loudness across a variety of content.

Broadcaster Benefits

Dolby Volume enables a full-range audio experience at all volume levels without loudness variation, regardless of content source or format.

Dolby's metadata-based loudness control mechanisms provide a powerful framework that enables broadcasters and operators worldwide to conform audio to the regional requirements.

Enables broadcasters and operators to follow loudness legislation in place for commercials/ads and long-form programming

Non-destructive processing gives consumers choices when it comes to high-quality audio playback

Integrated control framework ensures compatibility with millions of receivers

Provides a consistent experience from content creation through playback in the home

Built into STBs, televisions, and A/V receivers, mitigates volume inconsistencies the operator may not be able to control prior to transmission

Dolby Volume makes it possible to create a consistent broadcast in line with today’s consumer demands.

Answers viewer complaints about fluctuating volume levels across types of contents and playback devices.

Controls volume without compromising sound clarity

Fully complements Dolby’s professional loudness tools

Enables device manufacturers to deliver the promise of consistent loudness regardless of the content source

Consumer Benefits

The combination of Dolby metadata and Dolby Volume delivers a uniquely consistent and satisfying entertainment experience to the consumer.

Corrects volume level differences throughout the program, even during commercials, so viewers can "set and forget" their volume controls while Dolby Volume maintains their preferred playback level on all channels and content

Ensures a reference-quality listening experience at any volume level

Levels volume across playback devices, including televisions, home theaters, and set-top boxes

How It Works

Dolby’s metadata framework incorporates information about the audio into the bitstream itself.

Each frame of audio carries the required data that enables features such as downmixing, dynamic range control, and—most importantly—dialogue normalization.

The technologies behind Dolby Volume, such as auditory scene analysis and loudness-domain signal processing, are based on advanced models of human hearing and provide the perfect complement to Dolby metadata.

Dolby Volume corrects source and content level differences without the artifacts, such as pumping and breathing, introduced by previous leveling and compression solutions. This is particularly important for content sources that are not enabled by metadata.

Figures 1, 2, and 3 show examples of Dolby® Volume’s operation. The degree of loudness EQ applied is determined by the volume control setting on the TV set or playback system, or—in the case of surround sound systems equipped with automatic speaker balancing—the actual playback sound pressure level.

Dolby Volume supports stereo or multichannel audio at up to 192 kHz/24 bits. It is implemented in processors available to STB, TV, and A/V receiver manufacturers licensed by Dolby from a variety of IC suppliers listed on the password-protected Dolby extranet.

Dolby Volume Specs Figure 1


Dolby Volume Specs Figure 2


Dolby Volume Specs Figure 3


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