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The Magic Inside Dolby
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Learn how we support up-and-coming filmmakers during the creative process.
Get an inside look at how our team of scientists and engineers creates the magic behind your entertainment experiences.
Dolby in the Cinema
Be captivated by your favorite movies in Dolby sound.
Dolby Surround 7.1
Dolby Atmos Cinema Sound
Dolby Atmos propels you into the story with powerful, all-around sound.
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See your favorite movies in Dolby Atmos, Dolby Surround 7.1, or Dolby 3D.
Dolby at Home
Transform your living room into a sophisticated home theater with amazing sound and true-to-life video quality.
The Evolution of Surround Sound
Dolby led the evolution of stereo sound into surround and beyond.
Dolby Vision captures the story with incredibly bright colors, ultra-dark blacks, and vivid hues.
Dolby on the Go
Stellar sound quality. All of your favorite content. Wherever life takes you.
Amazon and Dolby Are Changing Mobile
Learn how Dolby and Amazon are changing the way you enjoy mobile entertainment.
Rediscover the Magic of Life of Pi
Hear the difference Dolby audio makes when you watch Life of Pi on your mobile device.
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
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Partners and Professionals
Find Dolby solutions, services, and support that can help you create more engaging products, content, and entertainment experiences.
PC and Mobile
Apply for a license to include Dolby technologies in your products.
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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
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