• Dolby Metadata

    • 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 Benefits

      • The Intended Experience

        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.

      • Consistent Loudness Levels

        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.

      • Late-Night Listening

        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.

      • 5.1 Channels Not Required

        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.

      • Optimal Sound for Your Setup

        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:

        • Dialogue normalization
        • Dynamic range control
        • Downmixing

        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.

        The Path of Metadata

        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 for Professionals

      Dolby metadata provides a number of key parameters designed to give consumers the optimal sound for any program regardless of their listening system.

      Broadcasters

      Deliver multichannel surround sound and more compressed stereo sound within a single audio stream using Dolby metadata.

    • Parameter

      Cinema Production

      Drama

      Documentary

      Music

      Live Sport

      Dialogue level

      -27

      -23

      -23

      -23

      -23

      Channel mode

      3/2

      3/2

      3/2

      3/2

      3/2

      LFE

      Enable

      Enable

      Enable

      Enable

      Enable

      Bitstream mode

      Film Standard

      Film Light

      Film Light

      Music Light

      Film Light

      RF mode pro

      Film Standard

      Film Light

      Film Light

      Music Light

      Film Light

      RF overmodulation protection

      Disable

      Disable

      Disable

      Disable

      Disable

      Center downmix level

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      Surround downmix level

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      Dolby Surround mode

      N/A

      N/A

      N/A

      N/A

      N/A

      Audio production information

      Yes

      Yes

      Yes

      Yes

      Yes

      Mix level

      105 dB

      85 dB

      85 dB

      95 dB

      85 dB

      Room type

      Large

      Small

      Small

      Small

      Small

      Copyright

      Yes

      Yes

      Yes

      Yes

      Yes

      Original bitstream

      Yes

      Yes

      Yes

      Yes

      Yes

      Preferred stereo downmix

      Lt/Rt

      Lo/Ro

      Lo/Ro

      Lo/Ro

      Lo/Ro

      Lt/Rt center downmix level

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      Lt/Rt surround downmix level

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      Lo/Ro center downmix level

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      Lo/Ro surround downmix level

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      0.707 (–3 dB)

      Dolby Surround EX™ mode

      Not Indicated

      Not Indicated

      Not Indicated

      Not Indicated

      Not Surround EX

      A/D converter type

      Standard

      Standard

      Standard

      Standard

      Standard

      DC filter

      Enable

      Enable

      Enable

      Enable

      Enable

      Lowpass filter

      Enable

      Enable

      Enable

      Enable

      Enable

      LFE lowpass filter

      Enable

      Enable

      Enable

      Enable

      Enable

      Surround 3 dB attenuation

      Enable

      Disable

      Disable

      Disable

      Disable

      Surround phase shift

      Enable

      Enable

      Enable

      Disable

      Enable