HDMI 2.1 Terms with Explanations

HDMI 2.1 Terms with Explanations

HDMI 2.1 Terms

Auto Low Latency Mode (ALLM)

  1. HDMI Video Flag that automatically sets the display into the lowest latency settings.

Capabilities Data Structure (CDS)

  1. Describes Audio Capabilities of an eARC RX (Audio Playback Device) to an eARC TX (Display).

Dynamic HDR

  1. Allows for HDR metadata to dynamically change frame by frame (scene by scene).

Enhanced Audio Return Channel (eARC)

  1. Upgrade to the previous Audio Return Channel increasing bandwidth and improving discovery of devices and device capabilities. Supports 192KHz 24 Bit signals and up to 32 Channels of uncompressed audio, including object-based audio from an eARC TX (Display) to an eARC RX (Audio Playback Device).
  1. Signaling method featuring 16b/18b encoding consisting of 3-4 Fixed Rate Lanes.

Fixed Rate Lane

  1. Audio and Video transmission channel capable of carrying a fixed data rate of 3, 6, 8, 10, or 12Gbps.

Forward Error Correction (FEC)

  1. Algorithm used to correct possible transmission errors and ensure an error free transmission of the packets.

Gap Bit

  1. Data bit containing no information; Used to maintain data rate.

High Frame Rate (HFR)

  1. Traditionally used to describe films shot above 24fps. Today it is used to describe framerates above 60fps, usually 100-120fps.

Next Generation Audio (NGA)

  1. Used to describe the new audio formats for over the air broadcasting including object-based audio in ATSC 3.0. Typically referring to the Dolby AC-4 Codec.

Quick Frame Transport (QFT) or Fast VActive (FVA)

  1. Video Frames are sent faster from the source to sink (Frame Rate is not increased); Reducing overall latency.

Quick Media Switching (QMS) or VRR with M_CONST

  1. Allows Video at the same resolution to seamlessly switch between refresh rates.

Variable Refresh Rate (VRR)

  1. Dynamic refresh rate; allowing for content to be played as soon as it is rendered.


    • Related Articles

    • 4k & HDR: Extending HDMI

      Are high bandwidth signals over HDMI causing you headaches? In this educational webinar from AVPro Edge, Jason talks about HDMI cables, 18Gbps signals, system limitations, and how our products help you overcome these A/V hurdles. Take a listen and if ...

    • Extending HDMI with 4K & HDR

      Are high bandwidth signals over HDMI causing you headaches? In this educational webinar from AVPro Edge, Jason talks about HDMI cables, 18Gbps signals, system limitations, and how our products help you overcome these A/V hurdles. Take a listen and if ...

    • Engineer Data: 18Gbps HDMI Extension Using "ICT"

      ICT, Invisible Compression Technology, is AVPro's proprietary compression algorithm used in several of our HDBaseT matrix switchers and extension products. So what makes ICT special? We asked AVPro CTO Matt Murray to explain it for us. ICT is ...

    • In the Lab: What is 18Gbps HDMI Bandwidth?

      What is 18Gbps? It's the HDMI 2.0 maximum bandwidth! But what does that mean? There is a lot going on in the HDMI cable between your devices. In this video, Jason from the AVPro lab explains the basics of 18Gbps bandwidth, its contents, and more. If ...

    • Understanding HDMI Extension Limitations and How to Overcome Them

      In this Video AVPro Edge goes through different methods for extending HDMI.