We are a globally recognized innovator of sound, image, and voice technologies for cinemas, home theaters, PCs, mobile devices, and games.
Careers at Dolby
The Dolby Theatre
The Magic Inside Dolby
The Dolby Institute
Dolby in the Cinema
Dolby works with your favorite filmmakers and movie theaters to create a multidimensional cinema experience.
Find a Dolby Atmos Movie
The Dolby Cinema Experience
Dolby Surround 7.1
Dolby 3D at the Movies
Solutions for Distributors and Exhibitors
Dolby at Home
Transform your living room into a sophisticated home theater with amazing sound and true-to-life video quality.
Dolby Digital Plus
Home Theater Setup Guide
Speaker Setup Guide
Home Theater Products
Solutions for Broadcast Professionals
Dolby on the Go
Mobile devices with Dolby technologies dramatically improve your audio quality.
Drivers and Codecs
Solutions for Mobile and PC Professionals
Dolby at Work
Improve productivity by transforming the conference call into an in-person meeting experience with Dolby Voice and the Dolby Conference Phone.
Dolby Conference Phone
Partners and Professionals
Find Dolby solutions, services, and support that can help you create more engaging products, content, and entertainment experiences.
PC and Mobile
Dolby metadata gives broadcasters a simple and powerful way to ensure that audiences enjoy a quality, accurate audio experience, whether they're listening in full surround, stereo, or mono.
Dolby metadata tells your television or A/V receiver how to process the audio part of a program, protecting the audio integrity of your entertainment.
The dialogue normalization (or dialnorm) feature in Dolby metadata helps match loudness levels between programs and between media, so you enjoy a more consistent listening experience.
Dynamic range control lets you reduce the overall volume but still hear the quieter parts of a program. It's perfect when you don't want to disturb the neighbors or others in your home.
The downmixing feature in Dolby metadata means you can listen to multichannel programming using fewer speakers. Without downmixing, you'd need a 5.1-channel system to enjoy a 5.1-channel broadcast.
There was a time when every television had a single speaker in it, and every program was broadcast in mono. Then came stereo sound and 5.1-channel surround sound. You may have different setups within your home—a TV with two built-in speakers in your bedroom and a full-featured home theater in your living room. Dolby® metadata ensures that you experience optimal sound no matter which playback system you choose.
Metadata simply means "data about data." In the case of Dolby metadata, it's information about the audio portion of broadcast stream. This information includes three key parameters, sometimes called the three Ds:
Proper setting of the three Ds provides you with the best possible audio experience given your speaker count, the ambient noise levels in your listening environment, and the quality of your playback equipment.
Broadcasters set Dolby metadata levels when preparing content for broadcast. This could be at the time the content is created (production) or later during mastering (postproduction). The Dolby metadata travels alongside the content's audio program through the broadcast infrastructure until the audio and metadata are encoded for transmission.
When the broadcast signal reaches your home, the encoded data must be decoded. This task is accomplished by the decoder built into your television, set-top box, or A/V receiver. Once decoded, the Dolby metadata instructs your system on loudness control, dynamic range, downmixing, and any other parameters set before transmission.
Dolby metadata provides a number of key parameters designed to give consumers the optimal sound for any program regardless of their listening system.
Deliver multichannel surround sound and more compressed stereo sound within a single audio stream using Dolby metadata.
0.707 (–3 dB)
Not Surround EX
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.
More Like This
Controlling Broadcast Loudness with Dolby Solutions
Control broadcast loudness problems and ensure a better listening experience with Dolby solutions.
Dolby E enables broadcasting and postproduction facilities to carry up to eight channels of sound.
Find professional broadcast products to help you create, distribute, and transmit high-quality audio content.
Who We Are