The Ultra HD Forum has released version 1.0 of its Phases B Guidelines for the implementation of UHD.
UHD – ultra high definition – Televisions are growing in popularity around the world, such as broadcasters and streaming services. It serves more UHD / 4K content.
The goal of the guidelines is to help "the industry navigate the complex UHD landscape," the organization said.
"The UHD phase B guidelines introduce and demystify the next-generation UHD technologies that operators are exploring for future enhanced UHD services," he said.
Technologies covered by the new guidelines include:
- Dynamic HDR metadata systems, including Dolby Vision.
- HDR double layer technologies.
- Marco high rates.
- Next generation audio, including Dolby AC-4.
- Content-sensitive coding.
- AVS2 video codec.
HDR metadata systems
The forum stated that it is focusing on two HDR metadata systems – Dolby Vi sion and SL-HDR.
Dolby Vision is an ecosystem solution that uses dynamic HDR metadata to create, distribute and render HDR content.
It also "preserves artistic intention in a wide variety of distribution and display systems."
SL-HDR is a down-conversion method for deriving an SDR / BT.709 signal from an HDR / WCG signal.
"Dynamic HDR metadata SL-HDR contains the information needed to reconstruct the HDR / WCG signal, it is compatible with PQ, HLG and other HDR / WCG formats," the forum said.
The guidelines also addressed the improvement of viewer experiences and higher frame rates for content.  He stated that the new 4K frame rates "would exceed the capabilities of some parts of the ecosystem from end to end", however.
"For example, while HDMI 2.1 supports 4K 120 fps or 8K 60 fps, most transport production environment systems currently only support 2K at 100/120 fps."
While this may change in the Future, the forum describes a high frame rate with a spatial resolution of 2K for its Phase B guidelines.
The parameters are:
- velocity – 100 / 120fps
- Spatial resolution – HD
- Scan Type – Progressive
- Dynamic Range – SDR, HDR
- Bit Depth – 10
- Distribution codec – HEVC Ma in 10 Level 5.1
Next generation audio
"Next generation audio" complements and complements the UHD visual experience, the forum said.
New audio features include:
- Immersive 3 three-dimensional sound.
- Customization capabilities.
- Reproduction consisting of different speaker configurations, including headphones.
This will be possible thanks to Dolby AC-4 and MPEG-H audio.
MPEG-H Audio "Brings efficiently any combination of channel, object and scene-based signals" and includes Higher Order Ambisonics, the forum said.
"Each signal channel produced is part of a general description of the entire sound scene, independent of the number and location of the speakers."
Metadata also allows rendering, advanced volume control, personalization and interactivity, and improvement of dialogue, he said.
He stated that Dolby AC-4 also carries channel-based and object-based audio. elements, or a combination of both.
The description of the Phase B guidelines concluded with a section on coding with content or content-adaptive coding (CAE).
This is a class of techniques to improve coding efficiency, the forum said.
Intelligently exploits content properties to reduce bit rate, with "simple" content, such as scenes with little movement, encoded using fewer bits.
"Complex" content, such as high-motion scenes, is encoded using the bits necessary for quality reproduction.
"Since simple content is frequent, the use of CAE techniques can result in significant bandwidth savings."